regulator: palmas: support for external regulator through control outputs

Palmas device have control outputs like REGEN1, REGEN2, REGEN3,
SYSEN1 and SYSEN2. These control outputs can be used for controlling
external voltage switches to enabled/disable voltage outputs.

Add support of these control outputs through regulator framework.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 89 insertions, 12 deletions

diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
index af2109a73a80..c61c0fa83e22 100644
--- a/drivers/regulator/palmas-regulator.c
+++ b/drivers/regulator/palmas-regulator.c
@@ -165,6 +165,26 @@ static const struct regs_info palmas_regs_info[] = {
 		.vsel_addr	= PALMAS_LDOUSB_VOLTAGE,
 		.ctrl_addr	= PALMAS_LDOUSB_CTRL,
 	},
+	{
+		.name		= "REGEN1",
+		.ctrl_addr	= PALMAS_REGEN1_CTRL,
+	},
+	{
+		.name		= "REGEN2",
+		.ctrl_addr	= PALMAS_REGEN2_CTRL,
+	},
+	{
+		.name		= "REGEN3",
+		.ctrl_addr	= PALMAS_REGEN3_CTRL,
+	},
+	{
+		.name		= "SYSEN1",
+		.ctrl_addr	= PALMAS_SYSEN1_CTRL,
+	},
+	{
+		.name		= "SYSEN2",
+		.ctrl_addr	= PALMAS_SYSEN2_CTRL,
+	},
 };
 
 #define SMPS_CTRL_MODE_OFF		0x00
@@ -422,6 +442,12 @@ static struct regulator_ops palmas_ops_ldo = {
 	.map_voltage		= regulator_map_voltage_linear,
 };
 
+static struct regulator_ops palmas_ops_extreg = {
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+};
+
 /*
  * setup the hardware based sleep configuration of the SMPS/LDO regulators
  * from the platform data. This is different to the software based control
@@ -523,6 +549,28 @@ static int palmas_ldo_init(struct palmas *palmas, int id,
 	return 0;
 }
 
+static int palmas_extreg_init(struct palmas *palmas, int id,
+		struct palmas_reg_init *reg_init)
+{
+	unsigned int addr;
+	int ret;
+	unsigned int val = 0;
+
+	addr = palmas_regs_info[id].ctrl_addr;
+
+	if (reg_init->mode_sleep)
+		val = PALMAS_REGEN1_CTRL_MODE_SLEEP;
+
+	ret = palmas_update_bits(palmas, PALMAS_RESOURCE_BASE,
+			addr, PALMAS_REGEN1_CTRL_MODE_SLEEP, val);
+	if (ret < 0) {
+		dev_err(palmas->dev, "Resource reg 0x%02x update failed %d\n",
+			addr, ret);
+		return ret;
+	}
+	return 0;
+}
+
 static struct of_regulator_match palmas_matches[] = {
 	{ .name = "smps12", },
 	{ .name = "smps123", },
@@ -545,6 +593,11 @@ static struct of_regulator_match palmas_matches[] = {
 	{ .name = "ldo9", },
 	{ .name = "ldoln", },
 	{ .name = "ldousb", },
+	{ .name = "regen1", },
+	{ .name = "regen2", },
+	{ .name = "regen3", },
+	{ .name = "sysen1", },
+	{ .name = "sysen2", },
 };
 
 static void palmas_dt_to_pdata(struct device *dev,
@@ -763,21 +816,34 @@ static int palmas_regulators_probe(struct platform_device *pdev)
 		/* Register the regulators */
 		pmic->desc[id].name = palmas_regs_info[id].name;
 		pmic->desc[id].id = id;
-		pmic->desc[id].n_voltages = PALMAS_LDO_NUM_VOLTAGES;
-
-		pmic->desc[id].ops = &palmas_ops_ldo;
-
 		pmic->desc[id].type = REGULATOR_VOLTAGE;
 		pmic->desc[id].owner = THIS_MODULE;
-		pmic->desc[id].min_uV = 900000;
-		pmic->desc[id].uV_step = 50000;
-		pmic->desc[id].linear_min_sel = 1;
-		pmic->desc[id].vsel_reg = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
+
+		if (id < PALMAS_REG_REGEN1) {
+			pmic->desc[id].n_voltages = PALMAS_LDO_NUM_VOLTAGES;
+			pmic->desc[id].ops = &palmas_ops_ldo;
+			pmic->desc[id].min_uV = 900000;
+			pmic->desc[id].uV_step = 50000;
+			pmic->desc[id].linear_min_sel = 1;
+			pmic->desc[id].vsel_reg =
+					PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
 						palmas_regs_info[id].vsel_addr);
-		pmic->desc[id].vsel_mask = PALMAS_LDO1_VOLTAGE_VSEL_MASK;
-		pmic->desc[id].enable_reg = PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
+			pmic->desc[id].vsel_mask =
+					PALMAS_LDO1_VOLTAGE_VSEL_MASK;
+			pmic->desc[id].enable_reg =
+					PALMAS_BASE_TO_REG(PALMAS_LDO_BASE,
+						palmas_regs_info[id].ctrl_addr);
+			pmic->desc[id].enable_mask =
+					PALMAS_LDO1_CTRL_MODE_ACTIVE;
+		} else {
+			pmic->desc[id].n_voltages = 1;
+			pmic->desc[id].ops = &palmas_ops_extreg;
+			pmic->desc[id].enable_reg =
+					PALMAS_BASE_TO_REG(PALMAS_RESOURCE_BASE,
 						palmas_regs_info[id].ctrl_addr);
-		pmic->desc[id].enable_mask = PALMAS_LDO1_CTRL_MODE_ACTIVE;
+			pmic->desc[id].enable_mask =
+					PALMAS_REGEN1_CTRL_MODE_ACTIVE;
+		}
 
 		if (pdata)
 			config.init_data = pdata->reg_data[id];
@@ -803,7 +869,12 @@ static int palmas_regulators_probe(struct platform_device *pdev)
 		if (pdata) {
 			reg_init = pdata->reg_init[id];
 			if (reg_init) {
-				ret = palmas_ldo_init(palmas, id, reg_init);
+				if (id < PALMAS_REG_REGEN1)
+					ret = palmas_ldo_init(palmas,
+							id, reg_init);
+				else
+					ret = palmas_extreg_init(palmas,
+							id, reg_init);
 				if (ret) {
 					regulator_unregister(pmic->rdev[id]);
 					goto err_unregister_regulator;
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index a4d13d7cd001..44256aa7b46a 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -154,6 +154,12 @@ enum palmas_regulators {
 	PALMAS_REG_LDO9,
 	PALMAS_REG_LDOLN,
 	PALMAS_REG_LDOUSB,
+	/* External regulators */
+	PALMAS_REG_REGEN1,
+	PALMAS_REG_REGEN2,
+	PALMAS_REG_REGEN3,
+	PALMAS_REG_SYSEN1,
+	PALMAS_REG_SYSEN2,
 	/* Total number of regulators */
 	PALMAS_NUM_REGS,
 };