power: regulator: tps6287x: Add driver for TPS6287x step down convertors

Add driver for TPS6287x step down convertors

Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Kamlesh Gurudasani <kamlesh@ti.com>

3 files changed, 192 insertions, 0 deletions

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index c346d03507..3893f8d7e0 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -340,6 +340,15 @@ config DM_REGULATOR_TPS62360
 	implements the get/set api for value only, as the power line is
 	always on.
 
+config DM_REGULATOR_TPS6287X
+	bool "Enable driver for TPS6287x Power Regulator"
+	depends on DM_REGULATOR
+	help
+	The TPS6287X is a step down converter with a fast transient
+	response. This driver supports all four variants of the chip
+	(TPS62870, TPS62871, TPS62872, TPS62873). 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
@@ -359,6 +368,15 @@ config DM_REGULATOR_ANATOP
 	regulators. It is recommended that this option be enabled on
 	i.MX6 platform.
 
+config SPL_DM_REGULATOR_TPS6287X
+	bool "Enable driver for TPS6287x Power Regulator"
+	depends on SPL_DM_REGULATOR
+	help
+	The TPS6287X is a step down converter with a fast transient
+	response. This driver supports all four variants of the chip
+	(TPS62870, TPS62871, TPS62872, TPS62873). It implements the
+	get/set api for value only, as the power line is always on.
+
 config SPL_DM_REGULATOR_STPMIC1
 	bool "Enable driver for STPMIC1 regulators in SPL"
 	depends on SPL_DM_REGULATOR && PMIC_STPMIC1
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index 2d97e1033a..2bf63474f9 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -31,6 +31,7 @@ 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_TPS6287X) += tps6287x_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_STPMIC1) += stpmic1.o
 obj-$(CONFIG_DM_REGULATOR_TPS65941) += tps65941_regulator.o
 obj-$(CONFIG_DM_REGULATOR_SCMI) += scmi_regulator.o
diff --git a/drivers/power/regulator/tps6287x_regulator.c b/drivers/power/regulator/tps6287x_regulator.c
new file mode 100644
index 0000000000..5c3828c4cf
--- /dev/null
+++ b/drivers/power/regulator/tps6287x_regulator.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2024 Texas Instruments Incorporated - http://www.ti.com/
+ * Keerthy <j-keerthy@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <dm/device_compat.h>
+#include <power/regulator.h>
+
+#define TPS6287X_REG_VSET			0x0
+#define TPS6287X_REG_CONTROL1			0x1
+#define TPS6287X_REG_CONTROL2			0x2
+#define TPS6287X_REG_CONTROL3			0x3
+#define TPS6287X_REG_STATUS			0x4
+#define TPS6287X_REG_VSET_VSET_MASK		0xff
+#define TPS6287X_REG_CONTROL2_VRANGE_MASK	0xc
+
+struct tps6287x_regulator_config {
+	u32 vmin;
+	u32 vmax;
+};
+
+struct tps6287x_regulator_pdata {
+	u8 vsel_offset;
+	struct udevice *i2c;
+	struct tps6287x_regulator_config *config;
+};
+
+static struct tps6287x_regulator_config tps6287x_data = {
+	.vmin = 400000,
+	.vmax = 3350000,
+};
+
+static int tps6287x_regulator_set_value(struct udevice *dev, int uV)
+{
+	struct tps6287x_regulator_pdata *pdata = dev_get_plat(dev);
+	u8 regval, vset;
+	int ret;
+
+	if (uV < pdata->config->vmin || uV > pdata->config->vmax)
+		return -EINVAL;
+	/*
+	 * Based on the value of VRANGE bit field of CONTROL2 reg the range
+	 * varies.
+	 */
+	ret = dm_i2c_read(pdata->i2c, TPS6287X_REG_CONTROL2, &regval, 1);
+	if (ret) {
+		dev_err(dev, "CTRL2 reg read failed: %d\n", ret);
+		return ret;
+	}
+
+	regval &= TPS6287X_REG_CONTROL2_VRANGE_MASK;
+	regval >>= ffs(TPS6287X_REG_CONTROL2_VRANGE_MASK) - 1;
+
+	/*
+	 * VRANGE = 0. Increment step 1250 uV starting with 0 --> 400000 uV
+	 * VRANGE = 1. Increment step 2500 uV starting with 0 --> 400000 uV
+	 * VRANGE = 2. Increment step 5000 uV starting with 0 --> 400000 uV
+	 * VRANGE = 3. Increment step 10000 uV starting with 0 --> 800000 uV
+	 */
+	switch (regval) {
+	case 0:
+		vset = (uV - 400000) / 1250;
+		break;
+	case 1:
+		vset = (uV - 400000) / 2500;
+		break;
+	case 2:
+		vset = (uV - 400000) / 5000;
+		break;
+	case 3:
+		vset = (uV - 800000) / 10000;
+		break;
+	default:
+		pr_err("%s: invalid regval %d\n", dev->name, regval);
+		return -EINVAL;
+	}
+
+	return dm_i2c_write(pdata->i2c, TPS6287X_REG_VSET, &vset, 1);
+}
+
+static int tps6287x_regulator_get_value(struct udevice *dev)
+{
+	u8 regval, vset;
+	int uV;
+	int ret;
+	struct tps6287x_regulator_pdata *pdata = dev_get_plat(dev);
+
+	/*
+	 * Based on the value of VRANGE bit field of CONTROL2 reg the range
+	 * varies.
+	 */
+	ret = dm_i2c_read(pdata->i2c, TPS6287X_REG_CONTROL2, &regval, 1);
+	if (ret) {
+		dev_err(dev, "i2c read failed: %d\n", ret);
+		return ret;
+	}
+
+	regval &= TPS6287X_REG_CONTROL2_VRANGE_MASK;
+	regval >>= ffs(TPS6287X_REG_CONTROL2_VRANGE_MASK) - 1;
+
+	ret = dm_i2c_read(pdata->i2c, TPS6287X_REG_VSET, &vset, 1);
+	if (ret) {
+		dev_err(dev, "i2c VSET read failed: %d\n", ret);
+		return ret;
+	}
+
+	/*
+	 * VRANGE = 0. Increment step 1250 uV starting with 0 --> 400000 uV
+	 * VRANGE = 1. Increment step 2500 uV starting with 0 --> 400000 uV
+	 * VRANGE = 2. Increment step 5000 uV starting with 0 --> 400000 uV
+	 * VRANGE = 3. Increment step 10000 uV starting with 0 --> 800000 uV
+	 */
+	switch (regval) {
+	case 0:
+		uV = 400000 + vset * 1250;
+		break;
+	case 1:
+		uV = 400000 + vset * 2500;
+		break;
+	case 2:
+		uV = 400000 + vset * 5000;
+		break;
+	case 3:
+		uV = 800000 + vset * 10000;
+		break;
+	default:
+		pr_err("%s: invalid regval %d\n", dev->name, regval);
+		return -EINVAL;
+	}
+
+	return uV;
+}
+
+static int tps6287x_regulator_probe(struct udevice *dev)
+{
+	struct tps6287x_regulator_pdata *pdata = dev_get_plat(dev);
+	int ret, slave_id;
+
+	pdata->config = (void *)dev_get_driver_data(dev);
+
+	slave_id = devfdt_get_addr_index(dev, 0);
+
+	ret = i2c_get_chip(dev->parent, slave_id, 1, &pdata->i2c);
+	if (ret) {
+		dev_err(dev, "i2c dev get failed.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dm_regulator_ops tps6287x_regulator_ops = {
+	.get_value  = tps6287x_regulator_get_value,
+	.set_value  = tps6287x_regulator_set_value,
+};
+
+static const struct udevice_id tps6287x_regulator_ids[] = {
+	{ .compatible = "ti,tps6287x", .data = (ulong)&tps6287x_data },
+	{ },
+};
+
+U_BOOT_DRIVER(tps6287x_regulator) = {
+	.name = "tps6287x_regulator",
+	.id = UCLASS_REGULATOR,
+	.ops = &tps6287x_regulator_ops,
+	.of_match = tps6287x_regulator_ids,
+	.plat_auto	= sizeof(struct tps6287x_regulator_pdata),
+	.probe = tps6287x_regulator_probe,
+};