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/axp152.c

@@ -0,0 +1,92 @@
+/*
+ * (C) Copyright 2012
+ * Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <command.h>
+#include <asm/arch/pmic_bus.h>
+#include <axp_pmic.h>
+
+static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
+{
+	if (mvolt < min)
+		mvolt = min;
+	else if (mvolt > max)
+		mvolt = max;
+
+	return (mvolt - min) / div;
+}
+
+int axp_set_dcdc2(unsigned int mvolt)
+{
+	int rc;
+	u8 current, target;
+
+	target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);
+
+	/* Do we really need to be this gentle? It has built-in voltage slope */
+	while ((rc = pmic_bus_read(AXP152_DCDC2_VOLTAGE, &current)) == 0 &&
+	       current != target) {
+		if (current < target)
+			current++;
+		else
+			current--;
+		rc = pmic_bus_write(AXP152_DCDC2_VOLTAGE, current);
+		if (rc)
+			break;
+	}
+	return rc;
+}
+
+int axp_set_dcdc3(unsigned int mvolt)
+{
+	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 50);
+
+	return pmic_bus_write(AXP152_DCDC3_VOLTAGE, target);
+}
+
+int axp_set_dcdc4(unsigned int mvolt)
+{
+	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
+
+	return pmic_bus_write(AXP152_DCDC4_VOLTAGE, target);
+}
+
+int axp_set_aldo2(unsigned int mvolt)
+{
+	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);
+
+	return pmic_bus_write(AXP152_LDO2_VOLTAGE, target);
+}
+
+int axp_init(void)
+{
+	u8 ver;
+	int rc;
+
+	rc = pmic_bus_init();
+	if (rc)
+		return rc;
+
+	rc = pmic_bus_read(AXP152_CHIP_VERSION, &ver);
+	if (rc)
+		return rc;
+
+	if (ver != 0x05)
+		return -1;
+
+	return 0;
+}
+
+int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	pmic_bus_write(AXP152_SHUTDOWN, AXP152_POWEROFF);
+
+	/* infinite loop during shutdown */
+	while (1) {}
+
+	/* not reached */
+	return 0;
+}