regulator: add driver for the TPS65219 BUCK & LDO regulators

The TPS65219 I2S PMIC features 3 Buck converters and 4 linear regulators,
2 GPOs, 1 GPIO, and 3 multi-function-pin.

This adds the driver for the Buck converters & linear regulators.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

3 files changed, 390 insertions, 0 deletions

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index cd253b9..9145408 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -371,3 +371,12 @@ config DM_REGULATOR_SCMI
         help
           Enable this option if you want to support regulators exposed through
 	  the SCMI voltage domain protocol by a SCMI server.
+
+config DM_REGULATOR_TPS65219
+	bool "Enable driver for TPS65219 PMIC regulators"
+        depends on PMIC_TPS65219
+	help
+	This enables implementation of driver-model regulator uclass
+	features for REGULATOR TPS65219 and the family of TPS65219 PMICs.
+	TPS65219 series of PMICs have 3 single phase BUCKs & 4 LDOs.
+	The driver implements get/set api for value and enable.
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index 4efb32a..b9883df 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -32,3 +32,4 @@ obj-$(CONFIG_$(SPL_)DM_REGULATOR_STPMIC1) += stpmic1.o
 obj-$(CONFIG_DM_REGULATOR_TPS65941) += tps65941_regulator.o
 obj-$(CONFIG_DM_REGULATOR_SCMI) += scmi_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_ANATOP) += anatop_regulator.o
+obj-$(CONFIG_DM_REGULATOR_TPS65219) += tps65219_regulator.o
diff --git a/drivers/power/regulator/tps65219_regulator.c b/drivers/power/regulator/tps65219_regulator.c
new file mode 100644
index 0000000..023cf21
--- /dev/null
+++ b/drivers/power/regulator/tps65219_regulator.c
@@ -0,0 +1,380 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2022 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ *
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <log.h>
+#include <linux/delay.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <power/tps65219.h>
+
+static const unsigned int tps65219_buck_vout[TPS65219_BUCK_NUM] = {
+	[0] = TPS65219_BUCK1_VOUT_REG,
+	[1] = TPS65219_BUCK2_VOUT_REG,
+	[2] = TPS65219_BUCK3_VOUT_REG
+};
+
+static const unsigned int tps65219_ldo_vout[TPS65219_LDO_NUM] = {
+	[0] = TPS65219_LDO1_VOUT_REG,
+	[1] = TPS65219_LDO2_VOUT_REG,
+	[2] = TPS65219_LDO3_VOUT_REG,
+	[3] = TPS65219_LDO4_VOUT_REG,
+};
+
+static int tps65219_reg_enable(struct udevice *dev, unsigned int adr, int idx,
+			       int op, bool *enable)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, adr);
+	if (ret < 0)
+		return ret;
+
+	if (op == PMIC_OP_GET) {
+		if (ret & BIT(idx))
+			*enable = true;
+		else
+			*enable = false;
+
+		return 0;
+	} else if (op == PMIC_OP_SET) {
+		if (*enable)
+			ret |= BIT(idx);
+		else
+			ret &= ~BIT(idx);
+
+		ret = pmic_reg_write(dev->parent, adr, ret);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int tps65219_buck_enable(struct udevice *dev, int op, bool *enable)
+{
+	unsigned int adr;
+	struct dm_regulator_uclass_plat *uc_pdata;
+	int idx;
+
+	idx = dev->driver_data - 1;
+	uc_pdata = dev_get_uclass_plat(dev);
+	adr = uc_pdata->ctrl_reg;
+
+	return tps65219_reg_enable(dev, adr, idx, op, enable);
+}
+
+static int tps65219_buck_volt2val(int uV)
+{
+	if (uV > TPS65219_BUCK_VOLT_MAX)
+		return -EINVAL;
+	else if (uV >= 1400000)
+		return (uV - 1400000) / 100000 + 0x20;
+	else if (uV >= 600000)
+		return (uV - 600000) / 25000 + 0x00;
+	else
+		return -EINVAL;
+}
+
+static int tps65219_buck_val2volt(int val)
+{
+	if (val > TPS65219_VOLT_MASK)
+		return -EINVAL;
+	else if (val > 0x34)
+		return TPS65219_BUCK_VOLT_MAX;
+	else if (val > 0x20)
+		return 1400000 + (val - 0x20) * 100000;
+	else if (val >= 0)
+		return 600000 + val * 25000;
+	else
+		return -EINVAL;
+}
+
+static int tps65219_buck_val(struct udevice *dev, int op, int *uV)
+{
+	unsigned int adr;
+	int ret, val;
+	struct dm_regulator_uclass_plat *uc_pdata;
+
+	uc_pdata = dev_get_uclass_plat(dev);
+	adr = uc_pdata->volt_reg;
+
+	ret = pmic_reg_read(dev->parent, adr);
+	if (ret < 0)
+		return ret;
+
+	if (op == PMIC_OP_GET) {
+		*uV = 0;
+
+		ret &= TPS65219_VOLT_MASK;
+		ret = tps65219_buck_val2volt(ret);
+		if (ret < 0)
+			return ret;
+
+		*uV = ret;
+		return 0;
+	}
+
+	val = tps65219_buck_volt2val(*uV);
+	if (val < 0)
+		return val;
+
+	ret &= ~TPS65219_VOLT_MASK;
+	ret |= val;
+
+	ret = pmic_reg_write(dev->parent, adr, ret);
+
+	udelay(100);
+
+	return ret;
+}
+
+static int tps65219_ldo_enable(struct udevice *dev, int op, bool *enable)
+{
+	unsigned int adr;
+	struct dm_regulator_uclass_plat *uc_pdata;
+	int idx;
+
+	idx = TPS65219_BUCK_NUM + (dev->driver_data - 1);
+	uc_pdata = dev_get_uclass_plat(dev);
+	adr = uc_pdata->ctrl_reg;
+
+	return tps65219_reg_enable(dev, adr, idx, op, enable);
+}
+
+static int tps65219_ldo_volt2val(int idx, int uV)
+{
+	int base = TPS65219_LDO12_VOLT_MIN;
+	int max = TPS65219_LDO12_VOLT_MAX;
+
+	if (idx > 1) {
+		base = TPS65219_LDO34_VOLT_MIN;
+		max = TPS65219_LDO34_VOLT_MAX;
+	}
+
+	if (uV > max)
+		return -EINVAL;
+	else if (uV >= base)
+		return (uV - TPS65219_LDO12_VOLT_MIN) / 50000;
+	else
+		return -EINVAL;
+}
+
+static int tps65219_ldo_val2volt(int idx, int val)
+{
+	int reg_base = TPS65219_LDO12_VOLT_REG_MIN;
+	int reg_max = TPS65219_LDO12_VOLT_REG_MAX;
+	int base = TPS65219_LDO12_VOLT_MIN;
+	int max = TPS65219_LDO12_VOLT_MAX;
+
+	if (idx > 1) {
+		base = TPS65219_LDO34_VOLT_MIN;
+		max = TPS65219_LDO34_VOLT_MAX;
+		reg_base = TPS65219_LDO34_VOLT_REG_MIN;
+		reg_max = TPS65219_LDO34_VOLT_REG_MAX;
+	}
+
+	if (val > TPS65219_VOLT_MASK || val < 0)
+		return -EINVAL;
+	else if (val >= reg_max)
+		return max;
+	else if (val <= reg_base)
+		return base;
+	else if (val >= 0)
+		return TPS65219_LDO12_VOLT_MIN + (50000 * val);
+	else
+		return -EINVAL;
+}
+
+static int tps65219_ldo_val(struct udevice *dev, int op, int *uV)
+{
+	unsigned int adr;
+	int ret, val;
+	struct dm_regulator_uclass_plat *uc_pdata;
+	int idx;
+
+	idx = dev->driver_data - 1;
+	uc_pdata = dev_get_uclass_plat(dev);
+	adr = uc_pdata->volt_reg;
+
+	ret = pmic_reg_read(dev->parent, adr);
+	if (ret < 0)
+		return ret;
+
+	if (op == PMIC_OP_GET) {
+		*uV = 0;
+
+		ret &= TPS65219_VOLT_MASK;
+		ret = tps65219_ldo_val2volt(idx, ret);
+		if (ret < 0)
+			return ret;
+
+		*uV = ret;
+		return 0;
+	}
+
+	/* LDO1 & LDO2 in BYPASS mode only supports 1.5V max */
+	if (idx < 2 &&
+	    (ret & BIT(TPS65219_LDO12_BYP_CONFIG)) &&
+	    *uV < TPS65219_LDO12_VOLT_BYP_MIN)
+		return -EINVAL;
+
+	val = tps65219_ldo_volt2val(idx, *uV);
+	if (val < 0)
+		return val;
+
+	ret &= ~TPS65219_VOLT_MASK;
+	ret |= val;
+
+	ret = pmic_reg_write(dev->parent, adr, ret);
+
+	udelay(100);
+
+	return ret;
+}
+
+static int tps65219_ldo_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_plat *uc_pdata;
+	int idx;
+
+	uc_pdata = dev_get_uclass_plat(dev);
+	uc_pdata->type = REGULATOR_TYPE_LDO;
+
+	/* idx must be in 1..TPS65219_LDO_NUM */
+	idx = dev->driver_data;
+	if (idx < 1 || idx > TPS65219_LDO_NUM) {
+		printf("Wrong ID for regulator\n");
+		return -EINVAL;
+	}
+
+	uc_pdata->ctrl_reg = TPS65219_ENABLE_CTRL_REG;
+	uc_pdata->volt_reg = tps65219_ldo_vout[idx - 1];
+
+	return 0;
+}
+
+static int tps65219_buck_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_plat *uc_pdata;
+	int idx;
+
+	uc_pdata = dev_get_uclass_plat(dev);
+	uc_pdata->type = REGULATOR_TYPE_BUCK;
+
+	/* idx must be in 1..TPS65219_BUCK_NUM */
+	idx = dev->driver_data;
+	if (idx < 1 || idx > TPS65219_BUCK_NUM) {
+		printf("Wrong ID for regulator\n");
+		return -EINVAL;
+	}
+
+	uc_pdata->ctrl_reg = TPS65219_ENABLE_CTRL_REG;
+	uc_pdata->volt_reg = tps65219_buck_vout[idx - 1];
+
+	return 0;
+}
+
+static int ldo_get_value(struct udevice *dev)
+{
+	int uV;
+	int ret;
+
+	ret = tps65219_ldo_val(dev, PMIC_OP_GET, &uV);
+	if (ret)
+		return ret;
+
+	return uV;
+}
+
+static int ldo_set_value(struct udevice *dev, int uV)
+{
+	return tps65219_ldo_val(dev, PMIC_OP_SET, &uV);
+}
+
+static int ldo_get_enable(struct udevice *dev)
+{
+	bool enable = false;
+	int ret;
+
+	ret = tps65219_ldo_enable(dev, PMIC_OP_GET, &enable);
+	if (ret)
+		return ret;
+
+	return enable;
+}
+
+static int ldo_set_enable(struct udevice *dev, bool enable)
+{
+	return tps65219_ldo_enable(dev, PMIC_OP_SET, &enable);
+}
+
+static int buck_get_value(struct udevice *dev)
+{
+	int uV;
+	int ret;
+
+	ret = tps65219_buck_val(dev, PMIC_OP_GET, &uV);
+	if (ret)
+		return ret;
+
+	return uV;
+}
+
+static int buck_set_value(struct udevice *dev, int uV)
+{
+	return tps65219_buck_val(dev, PMIC_OP_SET, &uV);
+}
+
+static int buck_get_enable(struct udevice *dev)
+{
+	bool enable = false;
+	int ret;
+
+	ret = tps65219_buck_enable(dev, PMIC_OP_GET, &enable);
+	if (ret)
+		return ret;
+
+	return enable;
+}
+
+static int buck_set_enable(struct udevice *dev, bool enable)
+{
+	return tps65219_buck_enable(dev, PMIC_OP_SET, &enable);
+}
+
+static const struct dm_regulator_ops tps65219_ldo_ops = {
+	.get_value  = ldo_get_value,
+	.set_value  = ldo_set_value,
+	.get_enable = ldo_get_enable,
+	.set_enable = ldo_set_enable,
+};
+
+U_BOOT_DRIVER(tps65219_ldo) = {
+	.name = TPS65219_LDO_DRIVER,
+	.id = UCLASS_REGULATOR,
+	.ops = &tps65219_ldo_ops,
+	.probe = tps65219_ldo_probe,
+};
+
+static const struct dm_regulator_ops tps65219_buck_ops = {
+	.get_value  = buck_get_value,
+	.set_value  = buck_set_value,
+	.get_enable = buck_get_enable,
+	.set_enable = buck_set_enable,
+};
+
+U_BOOT_DRIVER(tps65219_buck) = {
+	.name = TPS65219_BUCK_DRIVER,
+	.id = UCLASS_REGULATOR,
+	.ops = &tps65219_buck_ops,
+	.probe = tps65219_buck_probe,
+};