avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/drivers/core/Kconfig

@@ -0,0 +1,204 @@
+menu "Generic Driver Options"
+
+config DM
+	bool "Enable Driver Model"
+	help
+	  This config option enables Driver Model. This brings in the core
+	  support, including scanning of platform data on start-up. If
+	  CONFIG_OF_CONTROL is enabled, the device tree will be scanned also
+	  when available.
+
+config SPL_DM
+	bool "Enable Driver Model for SPL"
+	depends on DM && SPL
+	help
+	  Enable driver model in SPL. You will need to provide a
+	  suitable malloc() implementation. If you are not using the
+	  full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
+	  consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
+	  must provide CONFIG_SYS_MALLOC_F_LEN to set the size.
+	  In most cases driver model will only allocate a few uclasses
+	  and devices in SPL, so 1KB should be enable. See
+	  CONFIG_SYS_MALLOC_F_LEN for more details on how to enable it.
+
+config DM_WARN
+	bool "Enable warnings in driver model"
+	depends on DM
+	default y
+	help
+	  The dm_warn() function can use up quite a bit of space for its
+	  strings. By default this is disabled for SPL builds to save space.
+	  This will cause dm_warn() to be compiled out - it will do nothing
+	  when called.
+
+config DM_DEVICE_REMOVE
+	bool "Support device removal"
+	depends on DM
+	default y
+	help
+	  We can save some code space by dropping support for removing a
+	  device. This is not normally required in SPL, so by default this
+	  option is disabled for SPL.
+
+	  Note that this may have undesirable results in the USB subsystem as
+	  it causes unplugged devices to linger around in the dm-tree, and it
+	  causes USB host controllers to not be stopped when booting the OS.
+
+config DM_STDIO
+	bool "Support stdio registration"
+	depends on DM
+	default y
+	help
+	  Normally serial drivers register with stdio so that they can be used
+	  as normal output devices. In SPL we don't normally use stdio, so
+	  we can omit this feature.
+
+config DM_SEQ_ALIAS
+	bool "Support numbered aliases in device tree"
+	depends on DM
+	default y
+	help
+	  Most boards will have a '/aliases' node containing the path to
+	  numbered devices (e.g. serial0 = &serial0). This feature can be
+	  disabled if it is not required.
+
+config SPL_DM_SEQ_ALIAS
+	bool "Support numbered aliases in device tree in SPL"
+	depends on DM
+	default n
+	help
+	  Most boards will have a '/aliases' node containing the path to
+	  numbered devices (e.g. serial0 = &serial0). This feature can be
+	  disabled if it is not required, to save code space in SPL.
+
+config REGMAP
+	bool "Support register maps"
+	depends on DM
+	help
+	  Hardware peripherals tend to have one or more sets of registers
+	  which can be accessed to control the hardware. A register map
+	  models this with a simple read/write interface. It can in principle
+	  support any bus type (I2C, SPI) but so far this only supports
+	  direct memory access.
+
+config SPL_REGMAP
+	bool "Support register maps in SPL"
+	depends on DM
+	help
+	  Hardware peripherals tend to have one or more sets of registers
+	  which can be accessed to control the hardware. A register map
+	  models this with a simple read/write interface. It can in principle
+	  support any bus type (I2C, SPI) but so far this only supports
+	  direct memory access.
+
+config SYSCON
+	bool "Support system controllers"
+	depends on REGMAP
+	help
+	  Many SoCs have a number of system controllers which are dealt with
+	  as a group by a single driver. Some common functionality is provided
+	  by this uclass, including accessing registers via regmap and
+	  assigning a unique number to each.
+
+config SPL_SYSCON
+	bool "Support system controllers in SPL"
+	depends on REGMAP
+	help
+	  Many SoCs have a number of system controllers which are dealt with
+	  as a group by a single driver. Some common functionality is provided
+	  by this uclass, including accessing registers via regmap and
+	  assigning a unique number to each.
+
+config DEVRES
+	bool "Managed device resources"
+	depends on DM
+	help
+	  This option enables the Managed device resources core support.
+	  Device resources managed by the devres framework are automatically
+	  released whether initialization fails half-way or the device gets
+	  detached.
+
+	  If this option is disabled, devres functions fall back to
+	  non-managed variants.  For example, devres_alloc() to kzalloc(),
+	  devm_kmalloc() to kmalloc(), etc.
+
+config DEBUG_DEVRES
+	bool "Managed device resources debugging functions"
+	depends on DEVRES
+	help
+	  If this option is enabled, devres debug messages are printed.
+	  Also, a function is available to dump a list of device resources.
+	  Select this if you are having a problem with devres or want to
+	  debug resource management for a managed device.
+
+	  If you are unsure about this, Say N here.
+
+config SIMPLE_BUS
+	bool "Support simple-bus driver"
+	depends on DM && OF_CONTROL
+	default y
+	help
+	  Supports the 'simple-bus' driver, which is used on some systems.
+
+config SPL_SIMPLE_BUS
+	bool "Support simple-bus driver in SPL"
+	depends on SPL_DM && SPL_OF_CONTROL
+	default y
+	help
+	  Supports the 'simple-bus' driver, which is used on some systems
+	  in SPL.
+
+config OF_TRANSLATE
+	bool "Translate addresses using fdt_translate_address"
+	depends on DM && OF_CONTROL
+	default y
+	help
+	  If this option is enabled, the reg property will be translated
+	  using the fdt_translate_address() function. This is necessary
+	  on some platforms (e.g. MVEBU) using complex "ranges"
+	  properties in many nodes. As this translation is not handled
+	  correctly in the default simple_bus_translate() function.
+
+	  If this option is not enabled, simple_bus_translate() will be
+	  used for the address translation. This function is faster and
+	  smaller in size than fdt_translate_address().
+
+config SPL_OF_TRANSLATE
+	bool "Translate addresses using fdt_translate_address in SPL"
+	depends on SPL_DM && SPL_OF_CONTROL
+	default n
+	help
+	  If this option is enabled, the reg property will be translated
+	  using the fdt_translate_address() function. This is necessary
+	  on some platforms (e.g. MVEBU) using complex "ranges"
+	  properties in many nodes. As this translation is not handled
+	  correctly in the default simple_bus_translate() function.
+
+	  If this option is not enabled, simple_bus_translate() will be
+	  used for the address translation. This function is faster and
+	  smaller in size than fdt_translate_address().
+
+config OF_ISA_BUS
+	bool
+	depends on OF_TRANSLATE
+	help
+	  Is this option is enabled then support for the ISA bus will
+	  be included for addresses read from DT. This is something that
+	  should be known to be required or not based upon the board
+	  being targetted, and whether or not it makes use of an ISA bus.
+
+	  The bus is matched based upon its node name equalling "isa". The
+	  busses #address-cells should equal 2, with the first cell being
+	  used to hold flags & flag 0x1 indicating that the address range
+	  should be accessed using I/O port in/out accessors. The second
+	  cell holds the offset into ISA bus address space. The #size-cells
+	  property should equal 1, and of course holds the size of the
+	  address range used by a device.
+
+	  If this option is not enabled then support for the ISA bus is
+	  not included and any such busses used in DT will be treated as
+	  typical simple-bus compatible busses. This will lead to
+	  mistranslation of device addresses, so ensure that this is
+	  enabled if your board does include an ISA bus.
+
+endmenu

u-boot/drivers/core/Makefile

@@ -0,0 +1,13 @@
+#
+# Copyright (c) 2013 Google, Inc
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	+= device.o lists.o root.o uclass.o util.o
+obj-$(CONFIG_DEVRES) += devres.o
+obj-$(CONFIG_$(SPL_)DM_DEVICE_REMOVE)	+= device-remove.o
+obj-$(CONFIG_$(SPL_)SIMPLE_BUS)	+= simple-bus.o
+obj-$(CONFIG_DM)	+= dump.o
+obj-$(CONFIG_$(SPL_)REGMAP)	+= regmap.o
+obj-$(CONFIG_$(SPL_)SYSCON)	+= syscon-uclass.o

u-boot/drivers/core/device-remove.c

@@ -0,0 +1,209 @@
+/*
+ * Device manager
+ *
+ * Copyright (c) 2014 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/uclass.h>
+#include <dm/uclass-internal.h>
+#include <dm/util.h>
+
+/**
+ * device_chld_unbind() - Unbind all device's children from the device
+ *
+ * On error, the function continues to unbind all children, and reports the
+ * first error.
+ *
+ * @dev:	The device that is to be stripped of its children
+ * @return 0 on success, -ve on error
+ */
+static int device_chld_unbind(struct udevice *dev)
+{
+	struct udevice *pos, *n;
+	int ret, saved_ret = 0;
+
+	assert(dev);
+
+	list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
+		ret = device_unbind(pos);
+		if (ret && !saved_ret)
+			saved_ret = ret;
+	}
+
+	return saved_ret;
+}
+
+/**
+ * device_chld_remove() - Stop all device's children
+ * @dev:	The device whose children are to be removed
+ * @return 0 on success, -ve on error
+ */
+static int device_chld_remove(struct udevice *dev)
+{
+	struct udevice *pos, *n;
+	int ret;
+
+	assert(dev);
+
+	list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
+		ret = device_remove(pos);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+int device_unbind(struct udevice *dev)
+{
+	const struct driver *drv;
+	int ret;
+
+	if (!dev)
+		return -EINVAL;
+
+	if (dev->flags & DM_FLAG_ACTIVATED)
+		return -EINVAL;
+
+	if (!(dev->flags & DM_FLAG_BOUND))
+		return -EINVAL;
+
+	drv = dev->driver;
+	assert(drv);
+
+	if (drv->unbind) {
+		ret = drv->unbind(dev);
+		if (ret)
+			return ret;
+	}
+
+	ret = device_chld_unbind(dev);
+	if (ret)
+		return ret;
+
+	if (dev->flags & DM_FLAG_ALLOC_PDATA) {
+		free(dev->platdata);
+		dev->platdata = NULL;
+	}
+	if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
+		free(dev->uclass_platdata);
+		dev->uclass_platdata = NULL;
+	}
+	if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
+		free(dev->parent_platdata);
+		dev->parent_platdata = NULL;
+	}
+	ret = uclass_unbind_device(dev);
+	if (ret)
+		return ret;
+
+	if (dev->parent)
+		list_del(&dev->sibling_node);
+
+	devres_release_all(dev);
+
+	if (dev->flags & DM_NAME_ALLOCED)
+		free((char *)dev->name);
+	free(dev);
+
+	return 0;
+}
+
+/**
+ * device_free() - Free memory buffers allocated by a device
+ * @dev:	Device that is to be started
+ */
+void device_free(struct udevice *dev)
+{
+	int size;
+
+	if (dev->driver->priv_auto_alloc_size) {
+		free(dev->priv);
+		dev->priv = NULL;
+	}
+	size = dev->uclass->uc_drv->per_device_auto_alloc_size;
+	if (size) {
+		free(dev->uclass_priv);
+		dev->uclass_priv = NULL;
+	}
+	if (dev->parent) {
+		size = dev->parent->driver->per_child_auto_alloc_size;
+		if (!size) {
+			size = dev->parent->uclass->uc_drv->
+					per_child_auto_alloc_size;
+		}
+		if (size) {
+			free(dev->parent_priv);
+			dev->parent_priv = NULL;
+		}
+	}
+
+	devres_release_probe(dev);
+}
+
+int device_remove(struct udevice *dev)
+{
+	const struct driver *drv;
+	int ret;
+
+	if (!dev)
+		return -EINVAL;
+
+	if (!(dev->flags & DM_FLAG_ACTIVATED))
+		return 0;
+
+	drv = dev->driver;
+	assert(drv);
+
+	ret = uclass_pre_remove_device(dev);
+	if (ret)
+		return ret;
+
+	ret = device_chld_remove(dev);
+	if (ret)
+		goto err;
+
+	if (drv->remove) {
+		ret = drv->remove(dev);
+		if (ret)
+			goto err_remove;
+	}
+
+	if (dev->parent && dev->parent->driver->child_post_remove) {
+		ret = dev->parent->driver->child_post_remove(dev);
+		if (ret) {
+			dm_warn("%s: Device '%s' failed child_post_remove()",
+				__func__, dev->name);
+		}
+	}
+
+	device_free(dev);
+
+	dev->seq = -1;
+	dev->flags &= ~DM_FLAG_ACTIVATED;
+
+	return ret;
+
+err_remove:
+	/* We can't put the children back */
+	dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
+		__func__, dev->name);
+err:
+	ret = uclass_post_probe_device(dev);
+	if (ret) {
+		dm_warn("%s: Device '%s' failed to post_probe on error path\n",
+			__func__, dev->name);
+	}
+
+	return ret;
+}

u-boot/drivers/core/device.c

@@ -0,0 +1,756 @@
+/*
+ * Device manager
+ *
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <fdt_support.h>
+#include <malloc.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/pinctrl.h>
+#include <dm/platdata.h>
+#include <dm/uclass.h>
+#include <dm/uclass-internal.h>
+#include <dm/util.h>
+#include <linux/err.h>
+#include <linux/list.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int device_bind_common(struct udevice *parent, const struct driver *drv,
+			      const char *name, void *platdata,
+			      ulong driver_data, int of_offset,
+			      struct udevice **devp)
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	int size, ret = 0;
+
+	if (devp)
+		*devp = NULL;
+	if (!name)
+		return -EINVAL;
+
+	ret = uclass_get(drv->id, &uc);
+	if (ret) {
+		debug("Missing uclass for driver %s\n", drv->name);
+		return ret;
+	}
+
+	dev = calloc(1, sizeof(struct udevice));
+	if (!dev)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&dev->sibling_node);
+	INIT_LIST_HEAD(&dev->child_head);
+	INIT_LIST_HEAD(&dev->uclass_node);
+#ifdef CONFIG_DEVRES
+	INIT_LIST_HEAD(&dev->devres_head);
+#endif
+	dev->platdata = platdata;
+	dev->driver_data = driver_data;
+	dev->name = name;
+	dev->of_offset = of_offset;
+	dev->parent = parent;
+	dev->driver = drv;
+	dev->uclass = uc;
+
+	dev->seq = -1;
+	dev->req_seq = -1;
+	if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
+		/*
+		 * Some devices, such as a SPI bus, I2C bus and serial ports
+		 * are numbered using aliases.
+		 *
+		 * This is just a 'requested' sequence, and will be
+		 * resolved (and ->seq updated) when the device is probed.
+		 */
+		if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
+			if (uc->uc_drv->name && of_offset != -1) {
+				fdtdec_get_alias_seq(gd->fdt_blob,
+						uc->uc_drv->name, of_offset,
+						&dev->req_seq);
+			}
+		}
+	}
+
+	if (!dev->platdata && drv->platdata_auto_alloc_size) {
+		dev->flags |= DM_FLAG_ALLOC_PDATA;
+		dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
+		if (!dev->platdata) {
+			ret = -ENOMEM;
+			goto fail_alloc1;
+		}
+	}
+
+	size = uc->uc_drv->per_device_platdata_auto_alloc_size;
+	if (size) {
+		dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
+		dev->uclass_platdata = calloc(1, size);
+		if (!dev->uclass_platdata) {
+			ret = -ENOMEM;
+			goto fail_alloc2;
+		}
+	}
+
+	if (parent) {
+		size = parent->driver->per_child_platdata_auto_alloc_size;
+		if (!size) {
+			size = parent->uclass->uc_drv->
+					per_child_platdata_auto_alloc_size;
+		}
+		if (size) {
+			dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
+			dev->parent_platdata = calloc(1, size);
+			if (!dev->parent_platdata) {
+				ret = -ENOMEM;
+				goto fail_alloc3;
+			}
+		}
+	}
+
+	/* put dev into parent's successor list */
+	if (parent)
+		list_add_tail(&dev->sibling_node, &parent->child_head);
+
+	ret = uclass_bind_device(dev);
+	if (ret)
+		goto fail_uclass_bind;
+
+	/* if we fail to bind we remove device from successors and free it */
+	if (drv->bind) {
+		ret = drv->bind(dev);
+		if (ret)
+			goto fail_bind;
+	}
+	if (parent && parent->driver->child_post_bind) {
+		ret = parent->driver->child_post_bind(dev);
+		if (ret)
+			goto fail_child_post_bind;
+	}
+	if (uc->uc_drv->post_bind) {
+		ret = uc->uc_drv->post_bind(dev);
+		if (ret)
+			goto fail_uclass_post_bind;
+	}
+
+	if (parent)
+		dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
+	if (devp)
+		*devp = dev;
+
+	dev->flags |= DM_FLAG_BOUND;
+
+	return 0;
+
+fail_uclass_post_bind:
+	/* There is no child unbind() method, so no clean-up required */
+fail_child_post_bind:
+	if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+		if (drv->unbind && drv->unbind(dev)) {
+			dm_warn("unbind() method failed on dev '%s' on error path\n",
+				dev->name);
+		}
+	}
+
+fail_bind:
+	if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+		if (uclass_unbind_device(dev)) {
+			dm_warn("Failed to unbind dev '%s' on error path\n",
+				dev->name);
+		}
+	}
+fail_uclass_bind:
+	if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
+		list_del(&dev->sibling_node);
+		if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
+			free(dev->parent_platdata);
+			dev->parent_platdata = NULL;
+		}
+	}
+fail_alloc3:
+	if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
+		free(dev->uclass_platdata);
+		dev->uclass_platdata = NULL;
+	}
+fail_alloc2:
+	if (dev->flags & DM_FLAG_ALLOC_PDATA) {
+		free(dev->platdata);
+		dev->platdata = NULL;
+	}
+fail_alloc1:
+	devres_release_all(dev);
+
+	free(dev);
+
+	return ret;
+}
+
+int device_bind_with_driver_data(struct udevice *parent,
+				 const struct driver *drv, const char *name,
+				 ulong driver_data, int of_offset,
+				 struct udevice **devp)
+{
+	return device_bind_common(parent, drv, name, NULL, driver_data,
+				  of_offset, devp);
+}
+
+int device_bind(struct udevice *parent, const struct driver *drv,
+		const char *name, void *platdata, int of_offset,
+		struct udevice **devp)
+{
+	return device_bind_common(parent, drv, name, platdata, 0, of_offset,
+				  devp);
+}
+
+int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
+			const struct driver_info *info, struct udevice **devp)
+{
+	struct driver *drv;
+
+	drv = lists_driver_lookup_name(info->name);
+	if (!drv)
+		return -ENOENT;
+	if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
+		return -EPERM;
+
+	return device_bind(parent, drv, info->name, (void *)info->platdata,
+			   -1, devp);
+}
+
+static void *alloc_priv(int size, uint flags)
+{
+	void *priv;
+
+	if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
+		priv = memalign(ARCH_DMA_MINALIGN, size);
+		if (priv)
+			memset(priv, '\0', size);
+	} else {
+		priv = calloc(1, size);
+	}
+
+	return priv;
+}
+
+int device_probe(struct udevice *dev)
+{
+	const struct driver *drv;
+	int size = 0;
+	int ret;
+	int seq;
+
+	if (!dev)
+		return -EINVAL;
+
+	if (dev->flags & DM_FLAG_ACTIVATED)
+		return 0;
+
+	drv = dev->driver;
+	assert(drv);
+
+	/* Allocate private data if requested and not reentered */
+	if (drv->priv_auto_alloc_size && !dev->priv) {
+		dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
+		if (!dev->priv) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+	}
+	/* Allocate private data if requested and not reentered */
+	size = dev->uclass->uc_drv->per_device_auto_alloc_size;
+	if (size && !dev->uclass_priv) {
+		dev->uclass_priv = calloc(1, size);
+		if (!dev->uclass_priv) {
+			ret = -ENOMEM;
+			goto fail;
+		}
+	}
+
+	/* Ensure all parents are probed */
+	if (dev->parent) {
+		size = dev->parent->driver->per_child_auto_alloc_size;
+		if (!size) {
+			size = dev->parent->uclass->uc_drv->
+					per_child_auto_alloc_size;
+		}
+		if (size && !dev->parent_priv) {
+			dev->parent_priv = alloc_priv(size, drv->flags);
+			if (!dev->parent_priv) {
+				ret = -ENOMEM;
+				goto fail;
+			}
+		}
+
+		ret = device_probe(dev->parent);
+		if (ret)
+			goto fail;
+
+		/*
+		 * The device might have already been probed during
+		 * the call to device_probe() on its parent device
+		 * (e.g. PCI bridge devices). Test the flags again
+		 * so that we don't mess up the device.
+		 */
+		if (dev->flags & DM_FLAG_ACTIVATED)
+			return 0;
+	}
+
+	seq = uclass_resolve_seq(dev);
+	if (seq < 0) {
+		ret = seq;
+		goto fail;
+	}
+	dev->seq = seq;
+
+	dev->flags |= DM_FLAG_ACTIVATED;
+
+	/*
+	 * Process pinctrl for everything except the root device, and
+	 * continue regardless of the result of pinctrl. Don't process pinctrl
+	 * settings for pinctrl devices since the device may not yet be
+	 * probed.
+	 */
+	if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
+		pinctrl_select_state(dev, "default");
+
+	ret = uclass_pre_probe_device(dev);
+	if (ret)
+		goto fail;
+
+	if (dev->parent && dev->parent->driver->child_pre_probe) {
+		ret = dev->parent->driver->child_pre_probe(dev);
+		if (ret)
+			goto fail;
+	}
+
+	if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
+		ret = drv->ofdata_to_platdata(dev);
+		if (ret)
+			goto fail;
+	}
+
+	if (drv->probe) {
+		ret = drv->probe(dev);
+		if (ret) {
+			dev->flags &= ~DM_FLAG_ACTIVATED;
+			goto fail;
+		}
+	}
+
+	ret = uclass_post_probe_device(dev);
+	if (ret)
+		goto fail_uclass;
+
+	if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
+		pinctrl_select_state(dev, "default");
+
+	return 0;
+fail_uclass:
+	if (device_remove(dev)) {
+		dm_warn("%s: Device '%s' failed to remove on error path\n",
+			__func__, dev->name);
+	}
+fail:
+	dev->flags &= ~DM_FLAG_ACTIVATED;
+
+	dev->seq = -1;
+	device_free(dev);
+
+	return ret;
+}
+
+void *dev_get_platdata(struct udevice *dev)
+{
+	if (!dev) {
+		dm_warn("%s: null device\n", __func__);
+		return NULL;
+	}
+
+	return dev->platdata;
+}
+
+void *dev_get_parent_platdata(struct udevice *dev)
+{
+	if (!dev) {
+		dm_warn("%s: null device\n", __func__);
+		return NULL;
+	}
+
+	return dev->parent_platdata;
+}
+
+void *dev_get_uclass_platdata(struct udevice *dev)
+{
+	if (!dev) {
+		dm_warn("%s: null device\n", __func__);
+		return NULL;
+	}
+
+	return dev->uclass_platdata;
+}
+
+void *dev_get_priv(struct udevice *dev)
+{
+	if (!dev) {
+		dm_warn("%s: null device\n", __func__);
+		return NULL;
+	}
+
+	return dev->priv;
+}
+
+void *dev_get_uclass_priv(struct udevice *dev)
+{
+	if (!dev) {
+		dm_warn("%s: null device\n", __func__);
+		return NULL;
+	}
+
+	return dev->uclass_priv;
+}
+
+void *dev_get_parent_priv(struct udevice *dev)
+{
+	if (!dev) {
+		dm_warn("%s: null device\n", __func__);
+		return NULL;
+	}
+
+	return dev->parent_priv;
+}
+
+static int device_get_device_tail(struct udevice *dev, int ret,
+				  struct udevice **devp)
+{
+	if (ret)
+		return ret;
+
+	ret = device_probe(dev);
+	if (ret)
+		return ret;
+
+	*devp = dev;
+
+	return 0;
+}
+
+int device_get_child(struct udevice *parent, int index, struct udevice **devp)
+{
+	struct udevice *dev;
+
+	list_for_each_entry(dev, &parent->child_head, sibling_node) {
+		if (!index--)
+			return device_get_device_tail(dev, 0, devp);
+	}
+
+	return -ENODEV;
+}
+
+int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
+			     bool find_req_seq, struct udevice **devp)
+{
+	struct udevice *dev;
+
+	*devp = NULL;
+	if (seq_or_req_seq == -1)
+		return -ENODEV;
+
+	list_for_each_entry(dev, &parent->child_head, sibling_node) {
+		if ((find_req_seq ? dev->req_seq : dev->seq) ==
+				seq_or_req_seq) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+int device_get_child_by_seq(struct udevice *parent, int seq,
+			    struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = device_find_child_by_seq(parent, seq, false, &dev);
+	if (ret == -ENODEV) {
+		/*
+		 * We didn't find it in probed devices. See if there is one
+		 * that will request this seq if probed.
+		 */
+		ret = device_find_child_by_seq(parent, seq, true, &dev);
+	}
+	return device_get_device_tail(dev, ret, devp);
+}
+
+int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
+				   struct udevice **devp)
+{
+	struct udevice *dev;
+
+	*devp = NULL;
+
+	list_for_each_entry(dev, &parent->child_head, sibling_node) {
+		if (dev->of_offset == of_offset) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+int device_get_child_by_of_offset(struct udevice *parent, int node,
+				  struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = device_find_child_by_of_offset(parent, node, &dev);
+	return device_get_device_tail(dev, ret, devp);
+}
+
+static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
+							int of_offset)
+{
+	struct udevice *dev, *found;
+
+	if (parent->of_offset == of_offset)
+		return parent;
+
+	list_for_each_entry(dev, &parent->child_head, sibling_node) {
+		found = _device_find_global_by_of_offset(dev, of_offset);
+		if (found)
+			return found;
+	}
+
+	return NULL;
+}
+
+int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
+{
+	struct udevice *dev;
+
+	dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
+	return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
+}
+
+int device_find_first_child(struct udevice *parent, struct udevice **devp)
+{
+	if (list_empty(&parent->child_head)) {
+		*devp = NULL;
+	} else {
+		*devp = list_first_entry(&parent->child_head, struct udevice,
+					 sibling_node);
+	}
+
+	return 0;
+}
+
+int device_find_next_child(struct udevice **devp)
+{
+	struct udevice *dev = *devp;
+	struct udevice *parent = dev->parent;
+
+	if (list_is_last(&dev->sibling_node, &parent->child_head)) {
+		*devp = NULL;
+	} else {
+		*devp = list_entry(dev->sibling_node.next, struct udevice,
+				   sibling_node);
+	}
+
+	return 0;
+}
+
+struct udevice *dev_get_parent(struct udevice *child)
+{
+	return child->parent;
+}
+
+ulong dev_get_driver_data(struct udevice *dev)
+{
+	return dev->driver_data;
+}
+
+const void *dev_get_driver_ops(struct udevice *dev)
+{
+	if (!dev || !dev->driver->ops)
+		return NULL;
+
+	return dev->driver->ops;
+}
+
+enum uclass_id device_get_uclass_id(struct udevice *dev)
+{
+	return dev->uclass->uc_drv->id;
+}
+
+const char *dev_get_uclass_name(struct udevice *dev)
+{
+	if (!dev)
+		return NULL;
+
+	return dev->uclass->uc_drv->name;
+}
+
+fdt_addr_t dev_get_addr_index(struct udevice *dev, int index)
+{
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	fdt_addr_t addr;
+
+	if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
+		const fdt32_t *reg;
+		int len = 0;
+		int na, ns;
+
+		na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
+		if (na < 1) {
+			debug("bad #address-cells\n");
+			return FDT_ADDR_T_NONE;
+		}
+
+		ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
+		if (ns < 0) {
+			debug("bad #size-cells\n");
+			return FDT_ADDR_T_NONE;
+		}
+
+		reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len);
+		if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
+			debug("Req index out of range\n");
+			return FDT_ADDR_T_NONE;
+		}
+
+		reg += index * (na + ns);
+
+		/*
+		 * Use the full-fledged translate function for complex
+		 * bus setups.
+		 */
+		addr = fdt_translate_address((void *)gd->fdt_blob,
+					     dev->of_offset, reg);
+	} else {
+		/*
+		 * Use the "simple" translate function for less complex
+		 * bus setups.
+		 */
+		addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
+							dev->parent->of_offset,
+							dev->of_offset, "reg",
+							index, NULL);
+		if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
+			if (device_get_uclass_id(dev->parent) ==
+			    UCLASS_SIMPLE_BUS)
+				addr = simple_bus_translate(dev->parent, addr);
+		}
+	}
+
+	/*
+	 * Some platforms need a special address translation. Those
+	 * platforms (e.g. mvebu in SPL) can configure a translation
+	 * offset in the DM by calling dm_set_translation_offset() that
+	 * will get added to all addresses returned by dev_get_addr().
+	 */
+	addr += dm_get_translation_offset();
+
+	return addr;
+#else
+	return FDT_ADDR_T_NONE;
+#endif
+}
+
+fdt_addr_t dev_get_addr_name(struct udevice *dev, const char *name)
+{
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	int index;
+
+	index = fdt_find_string(gd->fdt_blob, dev->of_offset, "reg-names",
+				name);
+	if (index < 0)
+		return index;
+
+	return dev_get_addr_index(dev, index);
+#else
+	return FDT_ADDR_T_NONE;
+#endif
+}
+
+fdt_addr_t dev_get_addr(struct udevice *dev)
+{
+	return dev_get_addr_index(dev, 0);
+}
+
+void *dev_get_addr_ptr(struct udevice *dev)
+{
+	return (void *)(uintptr_t)dev_get_addr_index(dev, 0);
+}
+
+bool device_has_children(struct udevice *dev)
+{
+	return !list_empty(&dev->child_head);
+}
+
+bool device_has_active_children(struct udevice *dev)
+{
+	struct udevice *child;
+
+	for (device_find_first_child(dev, &child);
+	     child;
+	     device_find_next_child(&child)) {
+		if (device_active(child))
+			return true;
+	}
+
+	return false;
+}
+
+bool device_is_last_sibling(struct udevice *dev)
+{
+	struct udevice *parent = dev->parent;
+
+	if (!parent)
+		return false;
+	return list_is_last(&dev->sibling_node, &parent->child_head);
+}
+
+void device_set_name_alloced(struct udevice *dev)
+{
+	dev->flags |= DM_NAME_ALLOCED;
+}
+
+int device_set_name(struct udevice *dev, const char *name)
+{
+	name = strdup(name);
+	if (!name)
+		return -ENOMEM;
+	dev->name = name;
+	device_set_name_alloced(dev);
+
+	return 0;
+}
+
+bool of_device_is_compatible(struct udevice *dev, const char *compat)
+{
+	const void *fdt = gd->fdt_blob;
+
+	return !fdt_node_check_compatible(fdt, dev->of_offset, compat);
+}
+
+bool of_machine_is_compatible(const char *compat)
+{
+	const void *fdt = gd->fdt_blob;
+
+	return !fdt_node_check_compatible(fdt, 0, compat);
+}

u-boot/drivers/core/devres.c

@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * Based on the original work in Linux by
+ * Copyright (c) 2006  SUSE Linux Products GmbH
+ * Copyright (c) 2006  Tejun Heo <teheo@suse.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/compat.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <dm/device.h>
+#include <dm/root.h>
+#include <dm/util.h>
+
+/**
+ * struct devres - Bookkeeping info for managed device resource
+ * @entry: List to associate this structure with a device
+ * @release: Callback invoked when this resource is released
+ * @probe: Flag to show when this resource was allocated
+	   (true = probe, false = bind)
+ * @name: Name of release function
+ * @size: Size of resource data
+ * @data: Resource data
+ */
+struct devres {
+	struct list_head		entry;
+	dr_release_t			release;
+	bool				probe;
+#ifdef CONFIG_DEBUG_DEVRES
+	const char			*name;
+	size_t				size;
+#endif
+	unsigned long long		data[];
+};
+
+#ifdef CONFIG_DEBUG_DEVRES
+static void set_node_dbginfo(struct devres *dr, const char *name, size_t size)
+{
+	dr->name = name;
+	dr->size = size;
+}
+
+static void devres_log(struct udevice *dev, struct devres *dr,
+		       const char *op)
+{
+	printf("%s: DEVRES %3s %p %s (%lu bytes)\n",
+	       dev->name, op, dr, dr->name, (unsigned long)dr->size);
+}
+#else /* CONFIG_DEBUG_DEVRES */
+#define set_node_dbginfo(dr, n, s)	do {} while (0)
+#define devres_log(dev, dr, op)		do {} while (0)
+#endif
+
+#if CONFIG_DEBUG_DEVRES
+void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
+		     const char *name)
+#else
+void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
+#endif
+{
+	size_t tot_size = sizeof(struct devres) + size;
+	struct devres *dr;
+
+	dr = kmalloc(tot_size, gfp);
+	if (unlikely(!dr))
+		return NULL;
+
+	INIT_LIST_HEAD(&dr->entry);
+	dr->release = release;
+	set_node_dbginfo(dr, name, size);
+
+	return dr->data;
+}
+
+void devres_free(void *res)
+{
+	if (res) {
+		struct devres *dr = container_of(res, struct devres, data);
+
+		BUG_ON(!list_empty(&dr->entry));
+		kfree(dr);
+	}
+}
+
+void devres_add(struct udevice *dev, void *res)
+{
+	struct devres *dr = container_of(res, struct devres, data);
+
+	devres_log(dev, dr, "ADD");
+	BUG_ON(!list_empty(&dr->entry));
+	dr->probe = dev->flags & DM_FLAG_BOUND ? true : false;
+	list_add_tail(&dr->entry, &dev->devres_head);
+}
+
+void *devres_find(struct udevice *dev, dr_release_t release,
+		  dr_match_t match, void *match_data)
+{
+	struct devres *dr;
+
+	list_for_each_entry_reverse(dr, &dev->devres_head, entry) {
+		if (dr->release != release)
+			continue;
+		if (match && !match(dev, dr->data, match_data))
+			continue;
+		return dr->data;
+	}
+
+	return NULL;
+}
+
+void *devres_get(struct udevice *dev, void *new_res,
+		 dr_match_t match, void *match_data)
+{
+	struct devres *new_dr = container_of(new_res, struct devres, data);
+	void *res;
+
+	res = devres_find(dev, new_dr->release, match, match_data);
+	if (!res) {
+		devres_add(dev, new_res);
+		res = new_res;
+		new_res = NULL;
+	}
+	devres_free(new_res);
+
+	return res;
+}
+
+void *devres_remove(struct udevice *dev, dr_release_t release,
+		    dr_match_t match, void *match_data)
+{
+	void *res;
+
+	res = devres_find(dev, release, match, match_data);
+	if (res) {
+		struct devres *dr = container_of(res, struct devres, data);
+
+		list_del_init(&dr->entry);
+		devres_log(dev, dr, "REM");
+	}
+
+	return res;
+}
+
+int devres_destroy(struct udevice *dev, dr_release_t release,
+		   dr_match_t match, void *match_data)
+{
+	void *res;
+
+	res = devres_remove(dev, release, match, match_data);
+	if (unlikely(!res))
+		return -ENOENT;
+
+	devres_free(res);
+	return 0;
+}
+
+int devres_release(struct udevice *dev, dr_release_t release,
+		   dr_match_t match, void *match_data)
+{
+	void *res;
+
+	res = devres_remove(dev, release, match, match_data);
+	if (unlikely(!res))
+		return -ENOENT;
+
+	(*release)(dev, res);
+	devres_free(res);
+	return 0;
+}
+
+static void release_nodes(struct udevice *dev, struct list_head *head,
+			  bool probe_only)
+{
+	struct devres *dr, *tmp;
+
+	list_for_each_entry_safe_reverse(dr, tmp, head, entry)  {
+		if (probe_only && !dr->probe)
+			break;
+		devres_log(dev, dr, "REL");
+		dr->release(dev, dr->data);
+		list_del(&dr->entry);
+		kfree(dr);
+	}
+}
+
+void devres_release_probe(struct udevice *dev)
+{
+	release_nodes(dev, &dev->devres_head, true);
+}
+
+void devres_release_all(struct udevice *dev)
+{
+	release_nodes(dev, &dev->devres_head, false);
+}
+
+#ifdef CONFIG_DEBUG_DEVRES
+static void dump_resources(struct udevice *dev, int depth)
+{
+	struct devres *dr;
+	struct udevice *child;
+
+	printf("- %s\n", dev->name);
+
+	list_for_each_entry(dr, &dev->devres_head, entry)
+		printf("    %p (%lu byte) %s  %s\n", dr,
+		       (unsigned long)dr->size, dr->name,
+		       dr->probe ? "PROBE" : "BIND");
+
+	list_for_each_entry(child, &dev->child_head, sibling_node)
+		dump_resources(child, depth + 1);
+}
+
+void dm_dump_devres(void)
+{
+	struct udevice *root;
+
+	root = dm_root();
+	if (root)
+		dump_resources(root, 0);
+}
+#endif
+
+/*
+ * Managed kmalloc/kfree
+ */
+static void devm_kmalloc_release(struct udevice *dev, void *res)
+{
+	/* noop */
+}
+
+static int devm_kmalloc_match(struct udevice *dev, void *res, void *data)
+{
+	return res == data;
+}
+
+void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
+{
+	void *data;
+
+	data = _devres_alloc(devm_kmalloc_release, size, gfp);
+	if (unlikely(!data))
+		return NULL;
+
+	devres_add(dev, data);
+
+	return data;
+}
+
+void devm_kfree(struct udevice *dev, void *p)
+{
+	int rc;
+
+	rc = devres_destroy(dev, devm_kmalloc_release, devm_kmalloc_match, p);
+	WARN_ON(rc);
+}

u-boot/drivers/core/dump.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <mapmem.h>
+#include <dm/root.h>
+
+static void show_devices(struct udevice *dev, int depth, int last_flag)
+{
+	int i, is_last;
+	struct udevice *child;
+	char class_name[12];
+
+	/* print the first 11 characters to not break the tree-format. */
+	strlcpy(class_name, dev->uclass->uc_drv->name, sizeof(class_name));
+	printf(" %-11s [ %c ]    ", class_name,
+	       dev->flags & DM_FLAG_ACTIVATED ? '+' : ' ');
+
+	for (i = depth; i >= 0; i--) {
+		is_last = (last_flag >> i) & 1;
+		if (i) {
+			if (is_last)
+				printf("    ");
+			else
+				printf("|   ");
+		} else {
+			if (is_last)
+				printf("`-- ");
+			else
+				printf("|-- ");
+		}
+	}
+
+	printf("%s\n", dev->name);
+
+	list_for_each_entry(child, &dev->child_head, sibling_node) {
+		is_last = list_is_last(&child->sibling_node, &dev->child_head);
+		show_devices(child, depth + 1, (last_flag << 1) | is_last);
+	}
+}
+
+void dm_dump_all(void)
+{
+	struct udevice *root;
+
+	root = dm_root();
+	if (root) {
+		printf(" Class       Probed   Name\n");
+		printf("----------------------------------------\n");
+		show_devices(root, -1, 0);
+	}
+}
+
+/**
+ * dm_display_line() - Display information about a single device
+ *
+ * Displays a single line of information with an option prefix
+ *
+ * @dev:	Device to display
+ */
+static void dm_display_line(struct udevice *dev)
+{
+	printf("- %c %s @ %08lx",
+	       dev->flags & DM_FLAG_ACTIVATED ? '*' : ' ',
+	       dev->name, (ulong)map_to_sysmem(dev));
+	if (dev->seq != -1 || dev->req_seq != -1)
+		printf(", seq %d, (req %d)", dev->seq, dev->req_seq);
+	puts("\n");
+}
+
+void dm_dump_uclass(void)
+{
+	struct uclass *uc;
+	int ret;
+	int id;
+
+	for (id = 0; id < UCLASS_COUNT; id++) {
+		struct udevice *dev;
+
+		ret = uclass_get(id, &uc);
+		if (ret)
+			continue;
+
+		printf("uclass %d: %s\n", id, uc->uc_drv->name);
+		if (list_empty(&uc->dev_head))
+			continue;
+		list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+			dm_display_line(dev);
+		}
+		puts("\n");
+	}
+}

u-boot/drivers/core/lists.c

@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Marek Vasut <marex@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/platdata.h>
+#include <dm/uclass.h>
+#include <dm/util.h>
+#include <fdtdec.h>
+#include <linux/compiler.h>
+
+struct driver *lists_driver_lookup_name(const char *name)
+{
+	struct driver *drv =
+		ll_entry_start(struct driver, driver);
+	const int n_ents = ll_entry_count(struct driver, driver);
+	struct driver *entry;
+
+	for (entry = drv; entry != drv + n_ents; entry++) {
+		if (!strcmp(name, entry->name))
+			return entry;
+	}
+
+	/* Not found */
+	return NULL;
+}
+
+struct uclass_driver *lists_uclass_lookup(enum uclass_id id)
+{
+	struct uclass_driver *uclass =
+		ll_entry_start(struct uclass_driver, uclass);
+	const int n_ents = ll_entry_count(struct uclass_driver, uclass);
+	struct uclass_driver *entry;
+
+	for (entry = uclass; entry != uclass + n_ents; entry++) {
+		if (entry->id == id)
+			return entry;
+	}
+
+	return NULL;
+}
+
+int lists_bind_drivers(struct udevice *parent, bool pre_reloc_only)
+{
+	struct driver_info *info =
+		ll_entry_start(struct driver_info, driver_info);
+	const int n_ents = ll_entry_count(struct driver_info, driver_info);
+	struct driver_info *entry;
+	struct udevice *dev;
+	int result = 0;
+	int ret;
+
+	for (entry = info; entry != info + n_ents; entry++) {
+		ret = device_bind_by_name(parent, pre_reloc_only, entry, &dev);
+		if (ret && ret != -EPERM) {
+			dm_warn("No match for driver '%s'\n", entry->name);
+			if (!result || ret != -ENOENT)
+				result = ret;
+		}
+	}
+
+	return result;
+}
+
+int device_bind_driver(struct udevice *parent, const char *drv_name,
+		       const char *dev_name, struct udevice **devp)
+{
+	return device_bind_driver_to_node(parent, drv_name, dev_name, -1, devp);
+}
+
+int device_bind_driver_to_node(struct udevice *parent, const char *drv_name,
+			       const char *dev_name, int node,
+			       struct udevice **devp)
+{
+	struct driver *drv;
+	int ret;
+
+	drv = lists_driver_lookup_name(drv_name);
+	if (!drv) {
+		debug("Cannot find driver '%s'\n", drv_name);
+		return -ENOENT;
+	}
+	ret = device_bind(parent, drv, dev_name, NULL, node, devp);
+	if (ret) {
+		debug("Cannot create device named '%s' (err=%d)\n",
+		      dev_name, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+/**
+ * driver_check_compatible() - Check if a driver is compatible with this node
+ *
+ * @param blob:		Device tree pointer
+ * @param offset:	Offset of node in device tree
+ * @param of_match:	List of compatible strings to match
+ * @param of_idp:	Returns the match that was found
+ * @return 0 if there is a match, -ENOENT if no match, -ENODEV if the node
+ * does not have a compatible string, other error <0 if there is a device
+ * tree error
+ */
+static int driver_check_compatible(const void *blob, int offset,
+				   const struct udevice_id *of_match,
+				   const struct udevice_id **of_idp)
+{
+	int ret;
+
+	*of_idp = NULL;
+	if (!of_match)
+		return -ENOENT;
+
+	while (of_match->compatible) {
+		ret = fdt_node_check_compatible(blob, offset,
+						of_match->compatible);
+		if (!ret) {
+			*of_idp = of_match;
+			return 0;
+		} else if (ret == -FDT_ERR_NOTFOUND) {
+			return -ENODEV;
+		} else if (ret < 0) {
+			return -EINVAL;
+		}
+		of_match++;
+	}
+
+	return -ENOENT;
+}
+
+int lists_bind_fdt(struct udevice *parent, const void *blob, int offset,
+		   struct udevice **devp)
+{
+	struct driver *driver = ll_entry_start(struct driver, driver);
+	const int n_ents = ll_entry_count(struct driver, driver);
+	const struct udevice_id *id;
+	struct driver *entry;
+	struct udevice *dev;
+	bool found = false;
+	const char *name;
+	int result = 0;
+	int ret = 0;
+
+	dm_dbg("bind node %s\n", fdt_get_name(blob, offset, NULL));
+	if (devp)
+		*devp = NULL;
+	for (entry = driver; entry != driver + n_ents; entry++) {
+		ret = driver_check_compatible(blob, offset, entry->of_match,
+					      &id);
+		name = fdt_get_name(blob, offset, NULL);
+		if (ret == -ENOENT) {
+			continue;
+		} else if (ret == -ENODEV) {
+			dm_dbg("Device '%s' has no compatible string\n", name);
+			break;
+		} else if (ret) {
+			dm_warn("Device tree error at offset %d\n", offset);
+			result = ret;
+			break;
+		}
+
+		dm_dbg("   - found match at '%s'\n", entry->name);
+		ret = device_bind_with_driver_data(parent, entry, name,
+						   id->data, offset, &dev);
+		if (ret == -ENODEV) {
+			dm_dbg("Driver '%s' refuses to bind\n", entry->name);
+			continue;
+		}
+		if (ret) {
+			dm_warn("Error binding driver '%s': %d\n", entry->name,
+				ret);
+			return ret;
+		} else {
+			found = true;
+			if (devp)
+				*devp = dev;
+		}
+		break;
+	}
+
+	if (!found && !result && ret != -ENODEV) {
+		dm_dbg("No match for node '%s'\n",
+		       fdt_get_name(blob, offset, NULL));
+	}
+
+	return result;
+}
+#endif

u-boot/drivers/core/regmap.c

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <libfdt.h>
+#include <malloc.h>
+#include <mapmem.h>
+#include <regmap.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int regmap_init_mem(struct udevice *dev, struct regmap **mapp)
+{
+	const void *blob = gd->fdt_blob;
+	struct regmap_range *range;
+	const fdt32_t *cell;
+	struct regmap *map;
+	int count;
+	int addr_len, size_len, both_len;
+	int parent;
+	int len;
+
+	parent = dev->parent->of_offset;
+	addr_len = fdt_address_cells(blob, parent);
+	size_len = fdt_size_cells(blob, parent);
+	both_len = addr_len + size_len;
+
+	cell = fdt_getprop(blob, dev->of_offset, "reg", &len);
+	len /= sizeof(*cell);
+	count = len / both_len;
+	if (!cell || !count)
+		return -EINVAL;
+
+	map = malloc(sizeof(struct regmap));
+	if (!map)
+		return -ENOMEM;
+
+	if (count <= 1) {
+		map->range = &map->base_range;
+	} else {
+		map->range = malloc(count * sizeof(struct regmap_range));
+		if (!map->range) {
+			free(map);
+			return -ENOMEM;
+		}
+	}
+
+	map->base = fdtdec_get_number(cell, addr_len);
+	map->range_count = count;
+
+	for (range = map->range; count > 0;
+	     count--, cell += both_len, range++) {
+		range->start = fdtdec_get_number(cell, addr_len);
+		range->size = fdtdec_get_number(cell + addr_len, size_len);
+	}
+
+	*mapp = map;
+
+	return 0;
+}
+
+void *regmap_get_range(struct regmap *map, unsigned int range_num)
+{
+	struct regmap_range *range;
+
+	if (range_num >= map->range_count)
+		return NULL;
+	range = &map->range[range_num];
+
+	return map_sysmem(range->start, range->size);
+}
+
+int regmap_uninit(struct regmap *map)
+{
+	if (map->range_count > 1)
+		free(map->range);
+	free(map);
+
+	return 0;
+}

u-boot/drivers/core/root.c

@@ -0,0 +1,273 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <libfdt.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/platdata.h>
+#include <dm/root.h>
+#include <dm/uclass.h>
+#include <dm/util.h>
+#include <linux/list.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct root_priv {
+	fdt_addr_t translation_offset;	/* optional translation offset */
+};
+
+static const struct driver_info root_info = {
+	.name		= "root_driver",
+};
+
+struct udevice *dm_root(void)
+{
+	if (!gd->dm_root) {
+		dm_warn("Virtual root driver does not exist!\n");
+		return NULL;
+	}
+
+	return gd->dm_root;
+}
+
+fdt_addr_t dm_get_translation_offset(void)
+{
+	struct udevice *root = dm_root();
+	struct root_priv *priv = dev_get_priv(root);
+
+	return priv->translation_offset;
+}
+
+void dm_set_translation_offset(fdt_addr_t offs)
+{
+	struct udevice *root = dm_root();
+	struct root_priv *priv = dev_get_priv(root);
+
+	priv->translation_offset = offs;
+}
+
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+void fix_drivers(void)
+{
+	struct driver *drv =
+		ll_entry_start(struct driver, driver);
+	const int n_ents = ll_entry_count(struct driver, driver);
+	struct driver *entry;
+
+	for (entry = drv; entry != drv + n_ents; entry++) {
+		if (entry->of_match)
+			entry->of_match = (const struct udevice_id *)
+				((u32)entry->of_match + gd->reloc_off);
+		if (entry->bind)
+			entry->bind += gd->reloc_off;
+		if (entry->probe)
+			entry->probe += gd->reloc_off;
+		if (entry->remove)
+			entry->remove += gd->reloc_off;
+		if (entry->unbind)
+			entry->unbind += gd->reloc_off;
+		if (entry->ofdata_to_platdata)
+			entry->ofdata_to_platdata += gd->reloc_off;
+		if (entry->child_post_bind)
+			entry->child_post_bind += gd->reloc_off;
+		if (entry->child_pre_probe)
+			entry->child_pre_probe += gd->reloc_off;
+		if (entry->child_post_remove)
+			entry->child_post_remove += gd->reloc_off;
+		/* OPS are fixed in every uclass post_probe function */
+		if (entry->ops)
+			entry->ops += gd->reloc_off;
+	}
+}
+
+void fix_uclass(void)
+{
+	struct uclass_driver *uclass =
+		ll_entry_start(struct uclass_driver, uclass);
+	const int n_ents = ll_entry_count(struct uclass_driver, uclass);
+	struct uclass_driver *entry;
+
+	for (entry = uclass; entry != uclass + n_ents; entry++) {
+		if (entry->post_bind)
+			entry->post_bind += gd->reloc_off;
+		if (entry->pre_unbind)
+			entry->pre_unbind += gd->reloc_off;
+		if (entry->pre_probe)
+			entry->pre_probe += gd->reloc_off;
+		if (entry->post_probe)
+			entry->post_probe += gd->reloc_off;
+		if (entry->pre_remove)
+			entry->pre_remove += gd->reloc_off;
+		if (entry->child_post_bind)
+			entry->child_post_bind += gd->reloc_off;
+		if (entry->child_pre_probe)
+			entry->child_pre_probe += gd->reloc_off;
+		if (entry->init)
+			entry->init += gd->reloc_off;
+		if (entry->destroy)
+			entry->destroy += gd->reloc_off;
+		/* FIXME maybe also need to fix these ops */
+		if (entry->ops)
+			entry->ops += gd->reloc_off;
+	}
+}
+
+void fix_devices(void)
+{
+	struct driver_info *dev =
+		ll_entry_start(struct driver_info, driver_info);
+	const int n_ents = ll_entry_count(struct driver_info, driver_info);
+	struct driver_info *entry;
+
+	for (entry = dev; entry != dev + n_ents; entry++) {
+		if (entry->platdata)
+			entry->platdata += gd->reloc_off;
+	}
+}
+
+#endif
+
+int dm_init(void)
+{
+	int ret;
+
+	if (gd->dm_root) {
+		dm_warn("Virtual root driver already exists!\n");
+		return -EINVAL;
+	}
+	INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
+
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+	fix_drivers();
+	fix_uclass();
+	fix_devices();
+#endif
+
+	ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
+	if (ret)
+		return ret;
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+	DM_ROOT_NON_CONST->of_offset = 0;
+#endif
+	ret = device_probe(DM_ROOT_NON_CONST);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+int dm_uninit(void)
+{
+	device_remove(dm_root());
+	device_unbind(dm_root());
+
+	return 0;
+}
+
+int dm_scan_platdata(bool pre_reloc_only)
+{
+	int ret;
+
+	ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
+	if (ret == -ENOENT) {
+		dm_warn("Some drivers were not found\n");
+		ret = 0;
+	}
+
+	return ret;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
+		     bool pre_reloc_only)
+{
+	int ret = 0, err;
+
+	for (offset = fdt_first_subnode(blob, offset);
+	     offset > 0;
+	     offset = fdt_next_subnode(blob, offset)) {
+		if (pre_reloc_only &&
+		    !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL))
+			continue;
+		if (!fdtdec_get_is_enabled(blob, offset)) {
+			dm_dbg("   - ignoring disabled device\n");
+			continue;
+		}
+		err = lists_bind_fdt(parent, blob, offset, NULL);
+		if (err && !ret) {
+			ret = err;
+			debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
+			      ret);
+		}
+	}
+
+	if (ret)
+		dm_warn("Some drivers failed to bind\n");
+
+	return ret;
+}
+
+int dm_scan_fdt(const void *blob, bool pre_reloc_only)
+{
+	return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
+}
+#endif
+
+__weak int dm_scan_other(bool pre_reloc_only)
+{
+	return 0;
+}
+
+int dm_init_and_scan(bool pre_reloc_only)
+{
+	int ret;
+
+	ret = dm_init();
+	if (ret) {
+		debug("dm_init() failed: %d\n", ret);
+		return ret;
+	}
+	ret = dm_scan_platdata(pre_reloc_only);
+	if (ret) {
+		debug("dm_scan_platdata() failed: %d\n", ret);
+		return ret;
+	}
+
+	if (CONFIG_IS_ENABLED(OF_CONTROL)) {
+		ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
+		if (ret) {
+			debug("dm_scan_fdt() failed: %d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = dm_scan_other(pre_reloc_only);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/* This is the root driver - all drivers are children of this */
+U_BOOT_DRIVER(root_driver) = {
+	.name	= "root_driver",
+	.id	= UCLASS_ROOT,
+	.priv_auto_alloc_size = sizeof(struct root_priv),
+};
+
+/* This is the root uclass */
+UCLASS_DRIVER(root) = {
+	.name	= "root",
+	.id	= UCLASS_ROOT,
+};

u-boot/drivers/core/simple-bus.c

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/root.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct simple_bus_plat {
+	u32 base;
+	u32 size;
+	u32 target;
+};
+
+fdt_addr_t simple_bus_translate(struct udevice *dev, fdt_addr_t addr)
+{
+	struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
+
+	if (addr >= plat->base && addr < plat->base + plat->size)
+		addr = (addr - plat->base) + plat->target;
+
+	return addr;
+}
+
+static int simple_bus_post_bind(struct udevice *dev)
+{
+	u32 cell[3];
+	int ret;
+
+	ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "ranges",
+				   cell, ARRAY_SIZE(cell));
+	if (!ret) {
+		struct simple_bus_plat *plat = dev_get_uclass_platdata(dev);
+
+		plat->base = cell[0];
+		plat->target = cell[1];
+		plat->size = cell[2];
+	}
+
+	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+}
+
+UCLASS_DRIVER(simple_bus) = {
+	.id		= UCLASS_SIMPLE_BUS,
+	.name		= "simple_bus",
+	.post_bind	= simple_bus_post_bind,
+	.per_device_platdata_auto_alloc_size = sizeof(struct simple_bus_plat),
+};
+
+static const struct udevice_id generic_simple_bus_ids[] = {
+	{ .compatible = "simple-bus" },
+	{ .compatible = "simple-mfd" },
+	{ }
+};
+
+U_BOOT_DRIVER(simple_bus_drv) = {
+	.name	= "generic_simple_bus",
+	.id	= UCLASS_SIMPLE_BUS,
+	.of_match = generic_simple_bus_ids,
+};

u-boot/drivers/core/syscon-uclass.c

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <syscon.h>
+#include <dm.h>
+#include <errno.h>
+#include <regmap.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+#include <linux/err.h>
+
+struct regmap *syscon_get_regmap(struct udevice *dev)
+{
+	struct syscon_uc_info *priv;
+
+	if (device_get_uclass_id(dev) != UCLASS_SYSCON)
+		return ERR_PTR(-ENOEXEC);
+	priv = dev_get_uclass_priv(dev);
+	return priv->regmap;
+}
+
+static int syscon_pre_probe(struct udevice *dev)
+{
+	struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
+
+	return regmap_init_mem(dev, &priv->regmap);
+}
+
+int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_get(UCLASS_SYSCON, &uc);
+	if (ret)
+		return ret;
+	uclass_foreach_dev(dev, uc) {
+		if (dev->driver_data == driver_data) {
+			*devp = dev;
+			return device_probe(dev);
+		}
+	}
+
+	return -ENODEV;
+}
+
+struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
+{
+	struct syscon_uc_info *priv;
+	struct udevice *dev;
+	int ret;
+
+	ret = syscon_get_by_driver_data(driver_data, &dev);
+	if (ret)
+		return ERR_PTR(ret);
+	priv = dev_get_uclass_priv(dev);
+
+	return priv->regmap;
+}
+
+void *syscon_get_first_range(ulong driver_data)
+{
+	struct regmap *map;
+
+	map = syscon_get_regmap_by_driver_data(driver_data);
+	if (IS_ERR(map))
+		return map;
+	return regmap_get_range(map, 0);
+}
+
+UCLASS_DRIVER(syscon) = {
+	.id		= UCLASS_SYSCON,
+	.name		= "syscon",
+	.per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
+	.pre_probe = syscon_pre_probe,
+};

u-boot/drivers/core/uclass.c

@@ -0,0 +1,550 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <dm/device.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/uclass.h>
+#include <dm/uclass-internal.h>
+#include <dm/util.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct uclass *uclass_find(enum uclass_id key)
+{
+	struct uclass *uc;
+
+	if (!gd->dm_root)
+		return NULL;
+	/*
+	 * TODO(sjg@chromium.org): Optimise this, perhaps moving the found
+	 * node to the start of the list, or creating a linear array mapping
+	 * id to node.
+	 */
+	list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
+		if (uc->uc_drv->id == key)
+			return uc;
+	}
+
+	return NULL;
+}
+
+/**
+ * uclass_add() - Create new uclass in list
+ * @id: Id number to create
+ * @ucp: Returns pointer to uclass, or NULL on error
+ * @return 0 on success, -ve on error
+ *
+ * The new uclass is added to the list. There must be only one uclass for
+ * each id.
+ */
+static int uclass_add(enum uclass_id id, struct uclass **ucp)
+{
+	struct uclass_driver *uc_drv;
+	struct uclass *uc;
+	int ret;
+
+	*ucp = NULL;
+	uc_drv = lists_uclass_lookup(id);
+	if (!uc_drv) {
+		debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
+		      id);
+		/*
+		 * Use a strange error to make this case easier to find. When
+		 * a uclass is not available it can prevent driver model from
+		 * starting up and this failure is otherwise hard to debug.
+		 */
+		return -EPFNOSUPPORT;
+	}
+	uc = calloc(1, sizeof(*uc));
+	if (!uc)
+		return -ENOMEM;
+	if (uc_drv->priv_auto_alloc_size) {
+		uc->priv = calloc(1, uc_drv->priv_auto_alloc_size);
+		if (!uc->priv) {
+			ret = -ENOMEM;
+			goto fail_mem;
+		}
+	}
+	uc->uc_drv = uc_drv;
+	INIT_LIST_HEAD(&uc->sibling_node);
+	INIT_LIST_HEAD(&uc->dev_head);
+	list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST);
+
+	if (uc_drv->init) {
+		ret = uc_drv->init(uc);
+		if (ret)
+			goto fail;
+	}
+
+	*ucp = uc;
+
+	return 0;
+fail:
+	if (uc_drv->priv_auto_alloc_size) {
+		free(uc->priv);
+		uc->priv = NULL;
+	}
+	list_del(&uc->sibling_node);
+fail_mem:
+	free(uc);
+
+	return ret;
+}
+
+int uclass_destroy(struct uclass *uc)
+{
+	struct uclass_driver *uc_drv;
+	struct udevice *dev;
+	int ret;
+
+	/*
+	 * We cannot use list_for_each_entry_safe() here. If a device in this
+	 * uclass has a child device also in this uclass, it will be also be
+	 * unbound (by the recursion in the call to device_unbind() below).
+	 * We can loop until the list is empty.
+	 */
+	while (!list_empty(&uc->dev_head)) {
+		dev = list_first_entry(&uc->dev_head, struct udevice,
+				       uclass_node);
+		ret = device_remove(dev);
+		if (ret)
+			return ret;
+		ret = device_unbind(dev);
+		if (ret)
+			return ret;
+	}
+
+	uc_drv = uc->uc_drv;
+	if (uc_drv->destroy)
+		uc_drv->destroy(uc);
+	list_del(&uc->sibling_node);
+	if (uc_drv->priv_auto_alloc_size)
+		free(uc->priv);
+	free(uc);
+
+	return 0;
+}
+
+int uclass_get(enum uclass_id id, struct uclass **ucp)
+{
+	struct uclass *uc;
+
+	*ucp = NULL;
+	uc = uclass_find(id);
+	if (!uc)
+		return uclass_add(id, ucp);
+	*ucp = uc;
+
+	return 0;
+}
+
+int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
+{
+	struct uclass *uc;
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+	if (list_empty(&uc->dev_head))
+		return -ENODEV;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		if (!index--) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
+{
+	struct uclass *uc;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+	if (list_empty(&uc->dev_head))
+		return 0;
+
+	*devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
+
+	return 0;
+}
+
+int uclass_find_next_device(struct udevice **devp)
+{
+	struct udevice *dev = *devp;
+
+	*devp = NULL;
+	if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
+		return 0;
+
+	*devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
+
+	return 0;
+}
+
+int uclass_find_device_by_name(enum uclass_id id, const char *name,
+			       struct udevice **devp)
+{
+	struct uclass *uc;
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	if (!name)
+		return -EINVAL;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		if (!strncmp(dev->name, name, strlen(name))) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
+			      bool find_req_seq, struct udevice **devp)
+{
+	struct uclass *uc;
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq);
+	if (seq_or_req_seq == -1)
+		return -ENODEV;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		debug("   - %d %d\n", dev->req_seq, dev->seq);
+		if ((find_req_seq ? dev->req_seq : dev->seq) ==
+				seq_or_req_seq) {
+			*devp = dev;
+			debug("   - found\n");
+			return 0;
+		}
+	}
+	debug("   - not found\n");
+
+	return -ENODEV;
+}
+
+int uclass_find_device_by_of_offset(enum uclass_id id, int node,
+				    struct udevice **devp)
+{
+	struct uclass *uc;
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	if (node < 0)
+		return -ENODEV;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		if (dev->of_offset == node) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+static int uclass_find_device_by_phandle(enum uclass_id id,
+					 struct udevice *parent,
+					 const char *name,
+					 struct udevice **devp)
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	int find_phandle;
+	int ret;
+
+	*devp = NULL;
+	find_phandle = fdtdec_get_int(gd->fdt_blob, parent->of_offset, name,
+				      -1);
+	if (find_phandle <= 0)
+		return -ENOENT;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		uint phandle = fdt_get_phandle(gd->fdt_blob, dev->of_offset);
+
+		if (phandle == find_phandle) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+#endif
+
+int uclass_get_device_tail(struct udevice *dev, int ret,
+				  struct udevice **devp)
+{
+	if (ret)
+		return ret;
+
+	assert(dev);
+	ret = device_probe(dev);
+	if (ret)
+		return ret;
+
+	*devp = dev;
+
+	return 0;
+}
+
+int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_device(id, index, &dev);
+	return uclass_get_device_tail(dev, ret, devp);
+}
+
+int uclass_get_device_by_name(enum uclass_id id, const char *name,
+			      struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_device_by_name(id, name, &dev);
+	return uclass_get_device_tail(dev, ret, devp);
+}
+
+int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_device_by_seq(id, seq, false, &dev);
+	if (ret == -ENODEV) {
+		/*
+		 * We didn't find it in probed devices. See if there is one
+		 * that will request this seq if probed.
+		 */
+		ret = uclass_find_device_by_seq(id, seq, true, &dev);
+	}
+	return uclass_get_device_tail(dev, ret, devp);
+}
+
+int uclass_get_device_by_of_offset(enum uclass_id id, int node,
+				   struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_device_by_of_offset(id, node, &dev);
+	return uclass_get_device_tail(dev, ret, devp);
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
+				 const char *name, struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_device_by_phandle(id, parent, name, &dev);
+	return uclass_get_device_tail(dev, ret, devp);
+}
+#endif
+
+int uclass_first_device(enum uclass_id id, struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_first_device(id, &dev);
+	if (!dev)
+		return 0;
+	return uclass_get_device_tail(dev, ret, devp);
+}
+
+int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
+{
+	int ret;
+
+	ret = uclass_first_device(id, devp);
+	if (ret)
+		return ret;
+	else if (!*devp)
+		return -ENODEV;
+
+	return 0;
+}
+
+int uclass_next_device(struct udevice **devp)
+{
+	struct udevice *dev = *devp;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_next_device(&dev);
+	if (!dev)
+		return 0;
+	return uclass_get_device_tail(dev, ret, devp);
+}
+
+int uclass_bind_device(struct udevice *dev)
+{
+	struct uclass *uc;
+	int ret;
+
+	uc = dev->uclass;
+	list_add_tail(&dev->uclass_node, &uc->dev_head);
+
+	if (dev->parent) {
+		struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
+
+		if (uc_drv->child_post_bind) {
+			ret = uc_drv->child_post_bind(dev);
+			if (ret)
+				goto err;
+		}
+	}
+
+	return 0;
+err:
+	/* There is no need to undo the parent's post_bind call */
+	list_del(&dev->uclass_node);
+
+	return ret;
+}
+
+#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
+int uclass_unbind_device(struct udevice *dev)
+{
+	struct uclass *uc;
+	int ret;
+
+	uc = dev->uclass;
+	if (uc->uc_drv->pre_unbind) {
+		ret = uc->uc_drv->pre_unbind(dev);
+		if (ret)
+			return ret;
+	}
+
+	list_del(&dev->uclass_node);
+	return 0;
+}
+#endif
+
+int uclass_resolve_seq(struct udevice *dev)
+{
+	struct udevice *dup;
+	int seq;
+	int ret;
+
+	assert(dev->seq == -1);
+	ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
+					false, &dup);
+	if (!ret) {
+		dm_warn("Device '%s': seq %d is in use by '%s'\n",
+			dev->name, dev->req_seq, dup->name);
+	} else if (ret == -ENODEV) {
+		/* Our requested sequence number is available */
+		if (dev->req_seq != -1)
+			return dev->req_seq;
+	} else {
+		return ret;
+	}
+
+	for (seq = 0; seq < DM_MAX_SEQ; seq++) {
+		ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
+						false, &dup);
+		if (ret == -ENODEV)
+			break;
+		if (ret)
+			return ret;
+	}
+	return seq;
+}
+
+int uclass_pre_probe_device(struct udevice *dev)
+{
+	struct uclass_driver *uc_drv;
+	int ret;
+
+	uc_drv = dev->uclass->uc_drv;
+	if (uc_drv->pre_probe) {
+		ret = uc_drv->pre_probe(dev);
+		if (ret)
+			return ret;
+	}
+
+	if (!dev->parent)
+		return 0;
+	uc_drv = dev->parent->uclass->uc_drv;
+	if (uc_drv->child_pre_probe)
+		return uc_drv->child_pre_probe(dev);
+
+	return 0;
+}
+
+int uclass_post_probe_device(struct udevice *dev)
+{
+	struct uclass_driver *uc_drv = dev->uclass->uc_drv;
+
+	if (uc_drv->post_probe)
+		return uc_drv->post_probe(dev);
+
+	return 0;
+}
+
+#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
+int uclass_pre_remove_device(struct udevice *dev)
+{
+	struct uclass *uc;
+	int ret;
+
+	uc = dev->uclass;
+	if (uc->uc_drv->pre_remove) {
+		ret = uc->uc_drv->pre_remove(dev);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+#endif

u-boot/drivers/core/util.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <vsprintf.h>
+
+void dm_warn(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	vprintf(fmt, args);
+	va_end(args);
+}
+
+void dm_dbg(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	vprintf(fmt, args);
+	va_end(args);
+}
+
+int list_count_items(struct list_head *head)
+{
+	struct list_head *node;
+	int count = 0;
+
+	list_for_each(node, head)
+		count++;
+
+	return count;
+}