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/spmi/spmi-uclass.c

@@ -0,0 +1,48 @@
+/*
+ * SPMI bus uclass driver
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <dm/root.h>
+#include <spmi/spmi.h>
+#include <linux/ctype.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int spmi_reg_read(struct udevice *dev, int usid, int pid, int reg)
+{
+	const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
+
+	if (!ops || !ops->read)
+		return -ENOSYS;
+
+	return ops->read(dev, usid, pid, reg);
+}
+
+int spmi_reg_write(struct udevice *dev, int usid, int pid, int reg,
+		   uint8_t value)
+{
+	const struct dm_spmi_ops *ops = dev_get_driver_ops(dev);
+
+	if (!ops || !ops->write)
+		return -ENOSYS;
+
+	return ops->write(dev, usid, pid, reg, value);
+}
+
+static int spmi_post_bind(struct udevice *dev)
+{
+	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
+}
+
+UCLASS_DRIVER(spmi) = {
+	.id		= UCLASS_SPMI,
+	.name		= "spmi",
+	.post_bind	= spmi_post_bind,
+};