power: regulator: palmas: Add regulator support

The driver provides regulator set/get voltage
enable/disable functions for palmas family of PMICs.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

drivers/power/regulator/Kconfig

@@ -133,3 +133,11 @@ config REGULATOR_TPS65090
 	regulators, one for each FET. The standard regulator interface is
 	supported, but it is only possible to turn the regulators on or off.
 	There is no voltage/current control.
+
+config DM_REGULATOR_PALMAS
+	bool "Enable driver for PALMAS PMIC regulators"
+       depends on PMIC_PALMAS
+	---help---
+	This enables implementation of driver-model regulator uclass
+	features for REGULATOR PALMAS and the family of PALMAS PMICs.
+	The driver implements get/set api for: value and enable.

drivers/power/regulator/Makefile

@@ -16,3 +16,4 @@ obj-$(CONFIG_REGULATOR_RK808) += rk808.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o
 obj-$(CONFIG_REGULATOR_TPS65090) += tps65090_regulator.o
+obj-$(CONFIG_$(SPL_)DM_REGULATOR_PALMAS) += palmas_regulator.o

drivers/power/regulator/palmas_regulator.c

@@ -0,0 +1,453 @@
+/*
+ * (C) Copyright 2016
+ * Texas Instruments Incorporated, <www.ti.com>
+ *
+ * Keerthy <j-keerthy@ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <power/palmas.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define	REGULATOR_ON		0x1
+#define	REGULATOR_OFF		0x0
+
+#define	SMPS_MODE_MASK		0x3
+#define	SMPS_MODE_SHIFT		0x0
+#define	LDO_MODE_MASK		0x1
+#define	LDO_MODE_SHIFT		0x0
+
+static const char palmas_smps_ctrl[][PALMAS_SMPS_NUM] = {
+	{0x20, 0x24, 0x28, 0x2c, 0x30, 0x34, 0x38, 0x3c},
+	{0x20, 0x24, 0x28, 0x2c, 0x30, 0x34, 0x38},
+	{0x20, 0x24, 0x2c, 0x30, 0x38},
+};
+
+static const char palmas_smps_volt[][PALMAS_SMPS_NUM] = {
+	{0x23, 0x27, 0x2b, 0x2f, 0x33, 0x37, 0x3b, 0x3c},
+	{0x23, 0x27, 0x2b, 0x2f, 0x33, 0x37, 0x3b},
+	{0x23, 0x27, 0x2f, 0x33, 0x3B}
+};
+
+static const char palmas_ldo_ctrl[][PALMAS_LDO_NUM] = {
+	{0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62, 0x64},
+	{0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62, 0x64},
+	{0x50, 0x52, 0x54, 0x5e, 0x62}
+};
+
+static const char palmas_ldo_volt[][PALMAS_LDO_NUM] = {
+	{0x51, 0x53, 0x55, 0x57, 0x59, 0x5b, 0x5d, 0x5f, 0x61, 0x63, 0x65},
+	{0x51, 0x53, 0x55, 0x57, 0x59, 0x5b, 0x5d, 0x5f, 0x61, 0x63, 0x65},
+	{0x51, 0x53, 0x55, 0x5f, 0x63}
+};
+
+static int palmas_smps_enable(struct udevice *dev, int op, bool *enable)
+{
+	int ret;
+	unsigned int adr;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+	adr = uc_pdata->ctrl_reg;
+
+	ret = pmic_reg_read(dev->parent, adr);
+		if (ret < 0)
+			return ret;
+
+	if (op == PMIC_OP_GET) {
+		ret &= PALMAS_SMPS_STATUS_MASK;
+
+		if (ret)
+			*enable = true;
+		else
+			*enable = false;
+
+		return 0;
+	} else if (op == PMIC_OP_SET) {
+		if (*enable)
+			ret |= PALMAS_SMPS_MODE_MASK;
+		else
+			ret &= ~(PALMAS_SMPS_MODE_MASK);
+
+		ret = pmic_reg_write(dev->parent, adr, ret);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int palmas_smps_volt2hex(int uV)
+{
+	if (uV > PALMAS_LDO_VOLT_MAX)
+		return -EINVAL;
+
+	if (uV > 1650000)
+		return (uV - 1000000) / 20000 + 0x6;
+
+	if (uV == 500000)
+		return 0x6;
+	else
+		return 0x6 + ((uV - 500000) / 10000);
+}
+
+static int palmas_smps_hex2volt(int hex, bool range)
+{
+	unsigned int uV = 0;
+
+	if (hex > PALMAS_SMPS_VOLT_MAX_HEX)
+		return -EINVAL;
+
+	if (hex < 0x7)
+		uV = 500000;
+	else
+		uV = 500000 + (hex - 0x6) * 10000;
+
+	if (range)
+		uV *= 2;
+
+	return uV;
+}
+
+static int palmas_smps_val(struct udevice *dev, int op, int *uV)
+{
+	unsigned int hex, adr;
+	int ret;
+	bool range;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	if (op == PMIC_OP_GET)
+		*uV = 0;
+
+	adr = uc_pdata->volt_reg;
+
+	ret = pmic_reg_read(dev->parent, adr);
+	if (ret < 0)
+		return ret;
+
+	if (op == PMIC_OP_GET) {
+		if (ret & PALMAS_SMPS_RANGE_MASK)
+			range =  true;
+		else
+			range = false;
+
+		ret &= PALMAS_SMPS_VOLT_MASK;
+		ret = palmas_smps_hex2volt(ret, range);
+		if (ret < 0)
+			return ret;
+		*uV = ret;
+
+		return 0;
+	}
+
+	hex = palmas_smps_volt2hex(*uV);
+	if (hex < 0)
+		return hex;
+
+	ret &= ~PALMAS_SMPS_VOLT_MASK;
+	ret |= hex;
+	if (*uV > 1650000)
+		ret |= PALMAS_SMPS_RANGE_MASK;
+
+	return pmic_reg_write(dev->parent, adr, ret);
+}
+
+static int palmas_ldo_enable(struct udevice *dev, int op, bool *enable)
+{
+	int ret;
+	unsigned int adr;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+	adr = uc_pdata->ctrl_reg;
+
+	ret = pmic_reg_read(dev->parent, adr);
+		if (ret < 0)
+			return ret;
+
+	if (op == PMIC_OP_GET) {
+		ret &= PALMAS_LDO_STATUS_MASK;
+
+		if (ret)
+			*enable = true;
+		else
+			*enable = false;
+
+		return 0;
+	} else if (op == PMIC_OP_SET) {
+		if (*enable)
+			ret |= PALMAS_LDO_MODE_MASK;
+		else
+			ret &= ~(PALMAS_LDO_MODE_MASK);
+
+		ret = pmic_reg_write(dev->parent, adr, ret);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int palmas_ldo_volt2hex(int uV)
+{
+	if (uV > PALMAS_LDO_VOLT_MAX)
+		return -EINVAL;
+
+	return (uV - 850000) / 50000;
+}
+
+static int palmas_ldo_hex2volt(int hex)
+{
+	if (hex > PALMAS_LDO_VOLT_MAX_HEX)
+		return -EINVAL;
+
+	if (!hex)
+		return 0;
+
+	return (hex * 50000) + 850000;
+}
+
+static int palmas_ldo_val(struct udevice *dev, int op, int *uV)
+{
+	unsigned int hex, adr;
+	int ret;
+
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	if (op == PMIC_OP_GET)
+		*uV = 0;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	adr = uc_pdata->volt_reg;
+
+	ret = pmic_reg_read(dev->parent, adr);
+	if (ret < 0)
+		return ret;
+
+	if (op == PMIC_OP_GET) {
+		ret &= PALMAS_LDO_VOLT_MASK;
+		ret = palmas_ldo_hex2volt(ret);
+		if (ret < 0)
+			return ret;
+		*uV = ret;
+		return 0;
+	}
+
+	hex = palmas_ldo_volt2hex(*uV);
+	if (hex < 0)
+		return hex;
+
+	ret &= ~PALMAS_LDO_VOLT_MASK;
+	ret |= hex;
+	if (*uV > 1650000)
+		ret |= 0x80;
+
+	return pmic_reg_write(dev->parent, adr, ret);
+}
+
+static int palmas_ldo_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct udevice *parent;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	parent = dev_get_parent(dev);
+	int type = dev_get_driver_data(parent);
+
+	uc_pdata->type = REGULATOR_TYPE_LDO;
+
+	if (dev->driver_data) {
+		u8 idx = dev->driver_data - 1;
+		uc_pdata->ctrl_reg = palmas_ldo_ctrl[type][idx];
+		uc_pdata->volt_reg = palmas_ldo_volt[type][idx];
+	} else {
+		/* check for ldoln and ldousb cases */
+		if (!strcmp("ldoln", dev->name)) {
+			uc_pdata->ctrl_reg = palmas_ldo_ctrl[type][9];
+			uc_pdata->volt_reg = palmas_ldo_volt[type][9];
+		} else if (!strcmp("ldousb", dev->name)) {
+			uc_pdata->ctrl_reg = palmas_ldo_ctrl[type][10];
+			uc_pdata->volt_reg = palmas_ldo_volt[type][10];
+		}
+	}
+
+	return 0;
+}
+
+static int ldo_get_value(struct udevice *dev)
+{
+	int uV;
+	int ret;
+
+	ret = palmas_ldo_val(dev, PMIC_OP_GET, &uV);
+	if (ret)
+		return ret;
+
+	return uV;
+}
+
+static int ldo_set_value(struct udevice *dev, int uV)
+{
+	return palmas_ldo_val(dev, PMIC_OP_SET, &uV);
+}
+
+static bool ldo_get_enable(struct udevice *dev)
+{
+	bool enable = false;
+	int ret;
+
+	ret = palmas_ldo_enable(dev, PMIC_OP_GET, &enable);
+	if (ret)
+		return ret;
+
+	return enable;
+}
+
+static int ldo_set_enable(struct udevice *dev, bool enable)
+{
+	return palmas_ldo_enable(dev, PMIC_OP_SET, &enable);
+}
+
+static int palmas_smps_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct udevice *parent;
+	int idx;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	parent = dev_get_parent(dev);
+	int type = dev_get_driver_data(parent);
+
+	uc_pdata->type = REGULATOR_TYPE_BUCK;
+
+	switch (type) {
+	case PALMAS:
+	case TPS659038:
+		switch (dev->driver_data) {
+		case 123:
+		case 12:
+			uc_pdata->ctrl_reg = palmas_smps_ctrl[type][0];
+			uc_pdata->volt_reg = palmas_smps_volt[type][0];
+			break;
+		case 3:
+			uc_pdata->ctrl_reg = palmas_smps_ctrl[type][1];
+			uc_pdata->volt_reg = palmas_smps_volt[type][1];
+			break;
+		case 45:
+			uc_pdata->ctrl_reg = palmas_smps_ctrl[type][2];
+			uc_pdata->volt_reg = palmas_smps_volt[type][2];
+			break;
+		case 6:
+		case 7:
+		case 8:
+		case 9:
+		case 10:
+			idx = dev->driver_data - 4;
+			uc_pdata->ctrl_reg = palmas_smps_ctrl[type][idx];
+			uc_pdata->volt_reg = palmas_smps_volt[type][idx];
+			break;
+
+		default:
+			printf("Wrong ID for regulator\n");
+		}
+		break;
+
+	case TPS65917:
+		switch (dev->driver_data) {
+		case 1:
+		case 2:
+		case 3:
+		case 4:
+		case 5:
+			idx = dev->driver_data - 1;
+			uc_pdata->ctrl_reg = palmas_smps_ctrl[type][idx];
+			uc_pdata->volt_reg = palmas_smps_volt[type][idx];
+			break;
+
+		default:
+			printf("Wrong ID for regulator\n");
+		}
+		break;
+
+	default:
+			printf("Invalid PMIC ID\n");
+	}
+
+	return 0;
+}
+
+static int smps_get_value(struct udevice *dev)
+{
+	int uV;
+	int ret;
+
+	ret = palmas_smps_val(dev, PMIC_OP_GET, &uV);
+	if (ret)
+		return ret;
+
+	return uV;
+}
+
+static int smps_set_value(struct udevice *dev, int uV)
+{
+	return palmas_smps_val(dev, PMIC_OP_SET, &uV);
+}
+
+static bool smps_get_enable(struct udevice *dev)
+{
+	bool enable = false;
+	int ret;
+
+	ret = palmas_smps_enable(dev, PMIC_OP_GET, &enable);
+	if (ret)
+		return ret;
+
+	return enable;
+}
+
+static int smps_set_enable(struct udevice *dev, bool enable)
+{
+	return palmas_smps_enable(dev, PMIC_OP_SET, &enable);
+}
+
+static const struct dm_regulator_ops palmas_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(palmas_ldo) = {
+	.name = PALMAS_LDO_DRIVER,
+	.id = UCLASS_REGULATOR,
+	.ops = &palmas_ldo_ops,
+	.probe = palmas_ldo_probe,
+};
+
+static const struct dm_regulator_ops palmas_smps_ops = {
+	.get_value  = smps_get_value,
+	.set_value  = smps_set_value,
+	.get_enable = smps_get_enable,
+	.set_enable = smps_set_enable,
+};
+
+U_BOOT_DRIVER(palmas_smps) = {
+	.name = PALMAS_SMPS_DRIVER,
+	.id = UCLASS_REGULATOR,
+	.ops = &palmas_smps_ops,
+	.probe = palmas_smps_probe,
+};