power: regulator: tps6236x: add support for tps6236x regulators

TPS6236x is a family of step down DC-DC converters optimized for battery
powered portable applications for a small solution size. Add a regulator
driver for supporting these devices.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>

drivers/power/regulator/Kconfig

@@ -273,6 +273,16 @@ config DM_REGULATOR_TPS65910
 	regulator types of the TPS65910 (BUCK, BOOST and LDO). It implements
 	the get/set api for value and enable.
 
+config DM_REGULATOR_TPS62360
+	bool "Enable driver for TPS6236x Power Regulator"
+	depends on DM_REGULATOR
+	help
+	The TPS6236X DC/DC step down converter provides a single output
+	power line peaking at 3A current. This driver supports all four
+	variants of the chip (TPS62360, TPS62361, TPS62362, TPS62363). It
+	implements the get/set api for value only, as the power line is
+	always on.
+
 config DM_REGULATOR_STPMIC1
 	bool "Enable driver for STPMIC1 regulators"
 	depends on DM_REGULATOR && PMIC_STPMIC1

drivers/power/regulator/Makefile

@@ -26,4 +26,5 @@ obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP873X) += lp873x_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP87565) += lp87565_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
 obj-$(CONFIG_DM_REGULATOR_TPS65910) += tps65910_regulator.o
+obj-$(CONFIG_DM_REGULATOR_TPS62360) += tps62360_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_STPMIC1) += stpmic1.o

drivers/power/regulator/tps62360_regulator.c

@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+ *      Tero Kristo <t-kristo@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <power/regulator.h>
+
+#define TPS62360_REG_SET0	0
+
+#define TPS62360_I2C_CHIP	0x60
+
+#define TPS62360_VSEL_STEPSIZE	10000 /* In uV */
+
+struct tps62360_regulator_config {
+	u32 vmin;
+	u32 vmax;
+};
+
+struct tps62360_regulator_pdata {
+	u8 vsel_offset;
+	struct udevice *i2c;
+	struct tps62360_regulator_config *config;
+};
+
+/*
+ * TPS62362/TPS62363 are just re-using these values for now, their preset
+ * voltage values are just different compared to TPS62360/TPS62361.
+ */
+static struct tps62360_regulator_config tps62360_data = {
+	.vmin = 770000,
+	.vmax = 1400000,
+};
+
+static struct tps62360_regulator_config tps62361_data = {
+	.vmin = 500000,
+	.vmax = 1770000,
+};
+
+static int tps62360_regulator_set_value(struct udevice *dev, int uV)
+{
+	struct tps62360_regulator_pdata *pdata = dev_get_platdata(dev);
+	u8 regval;
+
+	if (uV < pdata->config->vmin || uV > pdata->config->vmax)
+		return -EINVAL;
+
+	uV -= pdata->config->vmin;
+
+	uV = DIV_ROUND_UP(uV, TPS62360_VSEL_STEPSIZE);
+
+	if (uV > U8_MAX)
+		return -EINVAL;
+
+	regval = (u8)uV;
+
+	return dm_i2c_write(pdata->i2c, TPS62360_REG_SET0 + pdata->vsel_offset,
+			    &regval, 1);
+}
+
+static int tps62360_regulator_get_value(struct udevice *dev)
+{
+	u8 regval;
+	int ret;
+	struct tps62360_regulator_pdata *pdata = dev_get_platdata(dev);
+
+	ret = dm_i2c_read(pdata->i2c, TPS62360_REG_SET0 + pdata->vsel_offset,
+			  &regval, 1);
+	if (ret) {
+		dev_err(dev, "i2c read failed: %d\n", ret);
+		return ret;
+	}
+
+	return (u32)regval * TPS62360_VSEL_STEPSIZE + pdata->config->vmin;
+}
+
+static int tps62360_regulator_ofdata_to_platdata(struct udevice *dev)
+{
+	struct tps62360_regulator_pdata *pdata = dev_get_platdata(dev);
+	u8 vsel0;
+	u8 vsel1;
+	int ret;
+
+	pdata->config = (void *)dev_get_driver_data(dev);
+
+	vsel0 = dev_read_bool(dev, "ti,vsel0-state-high");
+	vsel1 = dev_read_bool(dev, "ti,vsel1-state-high");
+
+	pdata->vsel_offset = vsel0 + vsel1 * 2;
+
+	ret = i2c_get_chip(dev->parent, TPS62360_I2C_CHIP, 1, &pdata->i2c);
+	if (ret) {
+		dev_err(dev, "i2c dev get failed.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dm_regulator_ops tps62360_regulator_ops = {
+	.get_value  = tps62360_regulator_get_value,
+	.set_value  = tps62360_regulator_set_value,
+};
+
+static const struct udevice_id tps62360_regulator_ids[] = {
+	{ .compatible = "ti,tps62360", .data = (ulong)&tps62360_data },
+	{ .compatible = "ti,tps62361", .data = (ulong)&tps62361_data },
+	{ .compatible = "ti,tps62362", .data = (ulong)&tps62360_data },
+	{ .compatible = "ti,tps62363", .data = (ulong)&tps62361_data },
+	{ },
+};
+
+U_BOOT_DRIVER(tps62360_regulator) = {
+	.name = "tps62360_regulator",
+	.id = UCLASS_REGULATOR,
+	.ops = &tps62360_regulator_ops,
+	.of_match = tps62360_regulator_ids,
+	.platdata_auto_alloc_size = sizeof(struct tps62360_regulator_pdata),
+	.ofdata_to_platdata = tps62360_regulator_ofdata_to_platdata,
+};