Initial import of qemu-2.4.1HEADmaster

8 files changed, 707 insertions, 0 deletions

diff --git a/roms/u-boot/drivers/power/pmic/Makefile b/roms/u-boot/drivers/power/pmic/Makefile
new file mode 100644
index 00000000..4129bdab
--- /dev/null
+++ b/roms/u-boot/drivers/power/pmic/Makefile
@@ -0,0 +1,14 @@
+#
+# Copyright (C) 2012 Samsung Electronics
+# Lukasz Majewski <l.majewski@samsung.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_POWER_MAX8998) += pmic_max8998.o
+obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
+obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
+obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
+obj-$(CONFIG_POWER_PFUZE100) += pmic_pfuze100.o
+obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
+obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
diff --git a/roms/u-boot/drivers/power/pmic/muic_max8997.c b/roms/u-boot/drivers/power/pmic/muic_max8997.c
new file mode 100644
index 00000000..720342e5
--- /dev/null
+++ b/roms/u-boot/drivers/power/pmic/muic_max8997.c
@@ -0,0 +1,74 @@
+/*
+ *  Copyright (C) 2012 Samsung Electronics
+ *  Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <power/pmic.h>
+#include <power/power_chrg.h>
+#include <power/max8997_muic.h>
+#include <i2c.h>
+#include <errno.h>
+
+static int power_chrg_get_type(struct pmic *p)
+{
+	unsigned int val;
+	unsigned char charge_type, charger;
+
+	if (pmic_probe(p))
+		return CHARGER_NO;
+
+	pmic_reg_read(p, MAX8997_MUIC_STATUS2, &val);
+	charge_type = val & MAX8997_MUIC_CHG_MASK;
+
+	switch (charge_type) {
+	case MAX8997_MUIC_CHG_NO:
+		charger = CHARGER_NO;
+		break;
+	case MAX8997_MUIC_CHG_USB:
+	case MAX8997_MUIC_CHG_USB_D:
+		charger = CHARGER_USB;
+		break;
+	case MAX8997_MUIC_CHG_TA:
+	case MAX8997_MUIC_CHG_TA_1A:
+		charger = CHARGER_TA;
+		break;
+	case MAX8997_MUIC_CHG_TA_500:
+		charger = CHARGER_TA_500;
+		break;
+	default:
+		charger = CHARGER_UNKNOWN;
+		break;
+	}
+
+	return charger;
+}
+
+static struct power_chrg power_chrg_muic_ops = {
+	.chrg_type = power_chrg_get_type,
+};
+
+int power_muic_init(unsigned int bus)
+{
+	static const char name[] = "MAX8997_MUIC";
+	struct pmic *p = pmic_alloc();
+
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	debug("Board Micro USB Interface Controller init\n");
+
+	p->name = name;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = MUIC_NUM_OF_REGS;
+	p->hw.i2c.addr = MAX8997_MUIC_I2C_ADDR;
+	p->hw.i2c.tx_num = 1;
+	p->bus = bus;
+
+	p->chrg = &power_chrg_muic_ops;
+	return 0;
+}
diff --git a/roms/u-boot/drivers/power/pmic/pmic_max77686.c b/roms/u-boot/drivers/power/pmic/pmic_max77686.c
new file mode 100644
index 00000000..d4c430e2
--- /dev/null
+++ b/roms/u-boot/drivers/power/pmic/pmic_max77686.c
@@ -0,0 +1,255 @@
+/*
+ *  Copyright (C) 2012 Samsung Electronics
+ *  Rajeshwari Shinde <rajeshwari.s@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/max77686_pmic.h>
+#include <errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const char max77686_buck_addr[] = {
+	0xff, 0x10, 0x12, 0x1c, 0x26, 0x30, 0x32, 0x34, 0x36, 0x38
+};
+
+static unsigned int max77686_ldo_volt2hex(int ldo, ulong uV)
+{
+	unsigned int hex = 0;
+
+	switch (ldo) {
+	case 1:
+	case 2:
+	case 6:
+	case 7:
+	case 8:
+	case 15:
+		hex = (uV - 800000) / 25000;
+		break;
+	default:
+		hex = (uV - 800000) / 50000;
+	}
+
+	if (hex >= 0 && hex <= MAX77686_LDO_VOLT_MAX_HEX)
+		return hex;
+
+	debug("%s: %ld is wrong voltage value for LDO%d\n", __func__, uV, ldo);
+	return 0;
+}
+
+int max77686_set_ldo_voltage(struct pmic *p, int ldo, ulong uV)
+{
+	unsigned int val, ret, hex, adr;
+
+	if (ldo < 1 && ldo > 26) {
+		printf("%s: %d is wrong ldo number\n", __func__, ldo);
+		return -1;
+	}
+
+	adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
+	hex = max77686_ldo_volt2hex(ldo, uV);
+
+	if (!hex)
+		return -1;
+
+	ret = pmic_reg_read(p, adr, &val);
+	if (ret)
+		return ret;
+
+	val &= ~MAX77686_LDO_VOLT_MASK;
+	val |= hex;
+	ret |= pmic_reg_write(p, adr, val);
+
+	return ret;
+}
+
+int max77686_set_ldo_mode(struct pmic *p, int ldo, char opmode)
+{
+	unsigned int val, ret, adr, mode;
+
+	if (ldo < 1 && 26 < ldo) {
+		printf("%s: %d is wrong ldo number\n", __func__, ldo);
+		return -1;
+	}
+
+	adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
+
+	/* mode */
+	switch (opmode) {
+	case OPMODE_OFF:
+		mode = MAX77686_LDO_MODE_OFF;
+		break;
+	case OPMODE_STANDBY:
+		switch (ldo) {
+		case 2:
+		case 6:
+		case 7:
+		case 8:
+		case 10:
+		case 11:
+		case 12:
+		case 14:
+		case 15:
+		case 16:
+			mode = MAX77686_LDO_MODE_STANDBY;
+			break;
+		default:
+			mode = 0xff;
+		}
+		break;
+	case OPMODE_LPM:
+		mode = MAX77686_LDO_MODE_LPM;
+		break;
+	case OPMODE_ON:
+		mode = MAX77686_LDO_MODE_ON;
+		break;
+	default:
+		mode = 0xff;
+	}
+
+	if (mode == 0xff) {
+		printf("%s: %d is not supported on LDO%d\n",
+		       __func__, opmode, ldo);
+		return -1;
+	}
+
+	ret = pmic_reg_read(p, adr, &val);
+	if (ret)
+		return ret;
+
+	val &= ~MAX77686_LDO_MODE_MASK;
+	val |= mode;
+	ret |= pmic_reg_write(p, adr, val);
+
+	return ret;
+}
+
+int max77686_set_buck_mode(struct pmic *p, int buck, char opmode)
+{
+	unsigned int val, ret, mask, adr, size, mode, mode_shift;
+
+	size = ARRAY_SIZE(max77686_buck_addr);
+	if (buck >= size) {
+		printf("%s: %d is wrong buck number\n", __func__, buck);
+		return -1;
+	}
+
+	adr = max77686_buck_addr[buck];
+
+	/* mask */
+	switch (buck) {
+	case 2:
+	case 3:
+	case 4:
+		mode_shift = MAX77686_BUCK_MODE_SHIFT_2;
+		break;
+	default:
+		mode_shift = MAX77686_BUCK_MODE_SHIFT_1;
+	}
+
+	mask = MAX77686_BUCK_MODE_MASK << mode_shift;
+
+	/* mode */
+	switch (opmode) {
+	case OPMODE_OFF:
+		mode = MAX77686_BUCK_MODE_OFF;
+		break;
+	case OPMODE_STANDBY:
+		switch (buck) {
+		case 1:
+		case 2:
+		case 3:
+		case 4:
+			mode = MAX77686_BUCK_MODE_STANDBY << mode_shift;
+			break;
+		default:
+			mode = 0xff;
+		}
+		break;
+	case OPMODE_LPM:
+		switch (buck) {
+		case 2:
+		case 3:
+		case 4:
+			mode = MAX77686_BUCK_MODE_LPM << mode_shift;
+			break;
+		default:
+			mode = 0xff;
+		}
+		break;
+	case OPMODE_ON:
+		mode = MAX77686_BUCK_MODE_ON << mode_shift;
+		break;
+	default:
+		mode = 0xff;
+	}
+
+	if (mode == 0xff) {
+		printf("%s: %d is not supported on BUCK%d\n",
+		       __func__, opmode, buck);
+		return -1;
+	}
+
+	ret = pmic_reg_read(p, adr, &val);
+	if (ret)
+		return ret;
+
+	val &= ~mask;
+	val |= mode;
+	ret |= pmic_reg_write(p, adr, val);
+
+	return ret;
+}
+
+int pmic_init(unsigned char bus)
+{
+	static const char name[] = "MAX77686_PMIC";
+	struct pmic *p = pmic_alloc();
+
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+#ifdef CONFIG_OF_CONTROL
+	const void *blob = gd->fdt_blob;
+	int node, parent;
+
+	node = fdtdec_next_compatible(blob, 0, COMPAT_MAXIM_MAX77686_PMIC);
+	if (node < 0) {
+		debug("PMIC: No node for PMIC Chip in device tree\n");
+		debug("node = %d\n", node);
+		return -1;
+	}
+
+	parent = fdt_parent_offset(blob, node);
+	if (parent < 0) {
+		debug("%s: Cannot find node parent\n", __func__);
+		return -1;
+	}
+
+	p->bus = i2c_get_bus_num_fdt(parent);
+	if (p->bus < 0) {
+		debug("%s: Cannot find I2C bus\n", __func__);
+		return -1;
+	}
+	p->hw.i2c.addr = fdtdec_get_int(blob, node, "reg", 9);
+#else
+	p->bus = bus;
+	p->hw.i2c.addr = MAX77686_I2C_ADDR;
+#endif
+
+	p->name = name;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = PMIC_NUM_OF_REGS;
+	p->hw.i2c.tx_num = 1;
+
+	puts("Board PMIC init\n");
+
+	return 0;
+}
diff --git a/roms/u-boot/drivers/power/pmic/pmic_max8997.c b/roms/u-boot/drivers/power/pmic/pmic_max8997.c
new file mode 100644
index 00000000..ba016923
--- /dev/null
+++ b/roms/u-boot/drivers/power/pmic/pmic_max8997.c
@@ -0,0 +1,107 @@
+/*
+ *  Copyright (C) 2012 Samsung Electronics
+ *  Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <power/pmic.h>
+#include <power/max8997_pmic.h>
+#include <i2c.h>
+#include <errno.h>
+
+unsigned char max8997_reg_ldo(int uV)
+{
+	unsigned char ret;
+	if (uV <= 800000)
+		return 0;
+	if (uV >= 3950000)
+		return MAX8997_LDO_MAX_VAL;
+	ret = (uV - 800000) / 50000;
+	if (ret > MAX8997_LDO_MAX_VAL) {
+		printf("MAX8997 LDO SETTING ERROR (%duV) -> %u\n", uV, ret);
+		ret = MAX8997_LDO_MAX_VAL;
+	}
+
+	return ret;
+}
+
+static int pmic_charger_state(struct pmic *p, int state, int current)
+{
+	unsigned char fc;
+	u32 val = 0;
+
+	if (pmic_probe(p))
+		return -1;
+
+	if (state == CHARGER_DISABLE) {
+		puts("Disable the charger.\n");
+		pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
+		val &= ~(MBCHOSTEN | VCHGR_FC);
+		pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
+
+		return -1;
+	}
+
+	if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
+		printf("%s: Wrong charge current: %d [mA]\n",
+		       __func__, current);
+		return -1;
+	}
+
+	fc = (current - CHARGER_MIN_CURRENT) / CHARGER_CURRENT_RESOLUTION;
+	fc = fc & 0xf; /* up to 950 mA */
+
+	printf("Enable the charger @ %d [mA]\n", fc * CHARGER_CURRENT_RESOLUTION
+	       + CHARGER_MIN_CURRENT);
+
+	val = fc | MBCICHFCSET;
+	pmic_reg_write(p, MAX8997_REG_MBCCTRL4, val);
+
+	pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
+	val = MBCHOSTEN | VCHGR_FC; /* enable charger & fast charge */
+	pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
+
+	return 0;
+}
+
+static int pmic_charger_bat_present(struct pmic *p)
+{
+	u32 val;
+
+	if (pmic_probe(p))
+		return -1;
+
+	pmic_reg_read(p, MAX8997_REG_STATUS4, &val);
+
+	return !(val & DETBAT);
+}
+
+static struct power_chrg power_chrg_pmic_ops = {
+	.chrg_bat_present = pmic_charger_bat_present,
+	.chrg_state = pmic_charger_state,
+};
+
+int pmic_init(unsigned char bus)
+{
+	static const char name[] = "MAX8997_PMIC";
+	struct pmic *p = pmic_alloc();
+
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	debug("Board PMIC init\n");
+
+	p->name = name;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = PMIC_NUM_OF_REGS;
+	p->hw.i2c.addr = MAX8997_I2C_ADDR;
+	p->hw.i2c.tx_num = 1;
+	p->bus = bus;
+
+	p->chrg = &power_chrg_pmic_ops;
+	return 0;
+}
diff --git a/roms/u-boot/drivers/power/pmic/pmic_max8998.c b/roms/u-boot/drivers/power/pmic/pmic_max8998.c
new file mode 100644
index 00000000..ca2f504c
--- /dev/null
+++ b/roms/u-boot/drivers/power/pmic/pmic_max8998.c
@@ -0,0 +1,33 @@
+/*
+ *  Copyright (C) 2011 Samsung Electronics
+ *  Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <power/pmic.h>
+#include <power/max8998_pmic.h>
+#include <errno.h>
+
+int pmic_init(unsigned char bus)
+{
+	static const char name[] = "MAX8998_PMIC";
+	struct pmic *p = pmic_alloc();
+
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	puts("Board PMIC init\n");
+
+	p->name = name;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = PMIC_NUM_OF_REGS;
+	p->hw.i2c.addr = MAX8998_I2C_ADDR;
+	p->hw.i2c.tx_num = 1;
+	p->bus = bus;
+
+	return 0;
+}
diff --git a/roms/u-boot/drivers/power/pmic/pmic_pfuze100.c b/roms/u-boot/drivers/power/pmic/pmic_pfuze100.c
new file mode 100644
index 00000000..22c1f15e
--- /dev/null
+++ b/roms/u-boot/drivers/power/pmic/pmic_pfuze100.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2014 Gateworks Corporation
+ * Tim Harvey <tharvey@gateworks.com>
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/pfuze100_pmic.h>
+
+int pmic_init(unsigned char bus)
+{
+	static const char name[] = "PFUZE100_PMIC";
+	struct pmic *p = pmic_alloc();
+
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	p->name = name;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = PMIC_NUM_OF_REGS;
+	p->hw.i2c.addr = CONFIG_POWER_PFUZE100_I2C_ADDR;
+	p->hw.i2c.tx_num = 1;
+	p->bus = bus;
+
+	return 0;
+}
diff --git a/roms/u-boot/drivers/power/pmic/pmic_tps65217.c b/roms/u-boot/drivers/power/pmic/pmic_tps65217.c
new file mode 100644
index 00000000..36e9024b
--- /dev/null
+++ b/roms/u-boot/drivers/power/pmic/pmic_tps65217.c
@@ -0,0 +1,109 @@
+/*
+ * (C) Copyright 2011-2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <power/tps65217.h>
+
+/**
+ * tps65217_reg_read() - Generic function that can read a TPS65217 register
+ * @src_reg:		 Source register address
+ * @src_val:		 Address of destination variable
+ * @return:		 0 for success, not 0 on failure.
+ */
+int tps65217_reg_read(uchar src_reg, uchar *src_val)
+{
+	return i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1);
+}
+
+/**
+ *  tps65217_reg_write() - Generic function that can write a TPS65217 PMIC
+ *			   register or bit field regardless of protection
+ *			   level.
+ *
+ *  @prot_level:	   Register password protection.  Use
+ *			   TPS65217_PROT_LEVEL_NONE,
+ *			   TPS65217_PROT_LEVEL_1 or TPS65217_PROT_LEVEL_2
+ *  @dest_reg:		   Register address to write.
+ *  @dest_val:		   Value to write.
+ *  @mask:		   Bit mask (8 bits) to be applied.  Function will only
+ *			   change bits that are set in the bit mask.
+ *
+ *  @return:		   0 for success, not 0 on failure, as per the i2c API
+ */
+int tps65217_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
+		       uchar mask)
+{
+	uchar read_val;
+	uchar xor_reg;
+	int ret;
+
+	/*
+	 * If we are affecting only a bit field, read dest_reg and apply the
+	 * mask
+	 */
+	if (mask != TPS65217_MASK_ALL_BITS) {
+		ret = i2c_read(TPS65217_CHIP_PM, dest_reg, 1, &read_val, 1);
+		if (ret)
+			return ret;
+		read_val &= (~mask);
+		read_val |= (dest_val & mask);
+		dest_val = read_val;
+	}
+
+	if (prot_level > 0) {
+		xor_reg = dest_reg ^ TPS65217_PASSWORD_UNLOCK;
+		ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
+				&xor_reg, 1);
+		if (ret)
+			return ret;
+	}
+
+	ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
+	if (ret)
+		return ret;
+
+	if (prot_level == TPS65217_PROT_LEVEL_2) {
+		ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
+				&xor_reg, 1);
+		if (ret)
+			return ret;
+
+		ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * tps65217_voltage_update() - Function to change a voltage level, as this
+ *			       is a multi-step process.
+ * @dc_cntrl_reg:	       DC voltage control register to change.
+ * @volt_sel:		       New value for the voltage register
+ * @return:		       0 for success, not 0 on failure.
+ */
+int tps65217_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
+{
+	if ((dc_cntrl_reg != TPS65217_DEFDCDC1) &&
+	    (dc_cntrl_reg != TPS65217_DEFDCDC2) &&
+	    (dc_cntrl_reg != TPS65217_DEFDCDC3))
+		return 1;
+
+	/* set voltage level */
+	if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
+			       TPS65217_MASK_ALL_BITS))
+		return 1;
+
+	/* set GO bit to initiate voltage transition */
+	if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, TPS65217_DEFSLEW,
+			       TPS65217_DCDC_GO, TPS65217_DCDC_GO))
+		return 1;
+
+	return 0;
+}
diff --git a/roms/u-boot/drivers/power/pmic/pmic_tps65910.c b/roms/u-boot/drivers/power/pmic/pmic_tps65910.c
new file mode 100644
index 00000000..7ee1160e
--- /dev/null
+++ b/roms/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;
+}