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/power/pmic/tps65090.c

@@ -0,0 +1,94 @@
+/*
+ * 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 <fdtdec.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/tps65090.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct pmic_child_info pmic_children_info[] = {
+	{ .prefix = "fet", .driver = TPS65090_FET_DRIVER },
+	{ },
+};
+
+static int tps65090_reg_count(struct udevice *dev)
+{
+	return TPS65090_NUM_REGS;
+}
+
+static int tps65090_write(struct udevice *dev, uint reg, const uint8_t *buff,
+			  int len)
+{
+	if (dm_i2c_write(dev, reg, buff, len)) {
+		error("write error to device: %p register: %#x!", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int tps65090_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+	int ret;
+
+	ret = dm_i2c_read(dev, reg, buff, len);
+	if (ret) {
+		error("read error %d from device: %p register: %#x!", ret, dev,
+		      reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int tps65090_bind(struct udevice *dev)
+{
+	int regulators_node;
+	const void *blob = gd->fdt_blob;
+	int children;
+
+	regulators_node = fdt_subnode_offset(blob, dev->of_offset,
+					     "regulators");
+	if (regulators_node <= 0) {
+		debug("%s: %s regulators subnode not found!", __func__,
+		      dev->name);
+		return -ENXIO;
+	}
+
+	debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
+
+	children = pmic_bind_children(dev, regulators_node, pmic_children_info);
+	if (!children)
+		debug("%s: %s - no child found\n", __func__, dev->name);
+
+	/* Always return success for this device */
+	return 0;
+}
+
+static struct dm_pmic_ops tps65090_ops = {
+	.reg_count = tps65090_reg_count,
+	.read = tps65090_read,
+	.write = tps65090_write,
+};
+
+static const struct udevice_id tps65090_ids[] = {
+	{ .compatible = "ti,tps65090" },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_tps65090) = {
+	.name = "tps65090 pmic",
+	.id = UCLASS_PMIC,
+	.of_match = tps65090_ids,
+	.bind = tps65090_bind,
+	.ops = &tps65090_ops,
+};