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/pmic_tps65910.c

@@ -0,0 +1,83 @@
+/*
+ * (C) Copyright 2011-2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <power/tps65910.h>
+
+/*
+ * tps65910_set_i2c_control() - Set the TPS65910 to be controlled via the I2C
+ * 				interface.
+ * @return:		       0 on success, not 0 on failure
+ */
+int tps65910_set_i2c_control(void)
+{
+	int ret;
+	uchar buf;
+
+	/* VDD1/2 voltage selection register access by control i/f */
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1,
+		       &buf, 1);
+
+	if (ret)
+		return ret;
+
+	buf |= TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C;
+
+	return i2c_write(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1,
+			 &buf, 1);
+}
+
+/*
+ * tps65910_voltage_update() - Voltage switching for MPU frequency switching.
+ * @module:		       mpu - 0, core - 1
+ * @vddx_op_vol_sel:	       vdd voltage to set
+ * @return:		       0 on success, not 0 on failure
+ */
+int tps65910_voltage_update(unsigned int module, unsigned char vddx_op_vol_sel)
+{
+	uchar buf;
+	unsigned int reg_offset;
+	int ret;
+
+	if (module == MPU)
+		reg_offset = TPS65910_VDD1_OP_REG;
+	else
+		reg_offset = TPS65910_VDD2_OP_REG;
+
+	/* Select VDDx OP   */
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	buf &= ~TPS65910_OP_REG_CMD_MASK;
+
+	ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	/* Configure VDDx OP  Voltage */
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	buf &= ~TPS65910_OP_REG_SEL_MASK;
+	buf |= vddx_op_vol_sel;
+
+	ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	if ((buf & TPS65910_OP_REG_SEL_MASK) != vddx_op_vol_sel)
+		return 1;
+
+	return 0;
+}