[PATCH 1/2] regulator: tps51632: add register property for regmap

[PATCH 1/2] regulator: tps51632: add register property for regmap

[Laxman Dewangan]

All TPS51632 registers are not readable/writable and
non-volatiles.

Add property of the registers whether it is readable/writable
or volatile for regmap framework.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
 drivers/regulator/tps51632-regulator.c |   41 ++++++++++++++++++++++++++++----
 1 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/drivers/regulator/tps51632-regulator.c b/drivers/regulator/tps51632-regulator.c
index ab21133..b96fb0e 100644
--- a/drivers/regulator/tps51632-regulator.c
+++ b/drivers/regulator/tps51632-regulator.c
@@ -205,18 +205,49 @@ skip_pwm_config:
 	return ret;
 }
 
-static bool rd_wr_reg(struct device *dev, unsigned int reg)
+static bool is_volatile_reg(struct device *dev, unsigned int reg)
 {
-	if ((reg >= 0x8) && (reg <= 0x10))
+	switch (reg) {
+	case TPS51632_OFFSET_REG:
+	case TPS51632_FAULT_REG:
+	case TPS51632_IMON_REG:
+		return true;
+	default:
 		return false;
-	return true;
+	}
+}
+
+static bool is_read_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case 0x08 ... 0x0F:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static bool is_write_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case TPS51632_VOLTAGE_SELECT_REG:
+	case TPS51632_VOLTAGE_BASE_REG:
+	case TPS51632_VMAX_REG:
+	case TPS51632_DVFS_CONTROL_REG:
+	case TPS51632_POWER_STATE_REG:
+	case TPS51632_SLEW_REGS:
+		return true;
+	default:
+		return false;
+	}
 }
 
 static const struct regmap_config tps51632_regmap_config = {
 	.reg_bits		= 8,
 	.val_bits		= 8,
-	.writeable_reg		= rd_wr_reg,
-	.readable_reg		= rd_wr_reg,
+	.writeable_reg		= is_write_reg,
+	.readable_reg		= is_read_reg,
+	.volatile_reg		= is_volatile_reg,
 	.max_register		= TPS51632_MAX_REG - 1,
 	.cache_type		= REGCACHE_RBTREE,
 };
-- 
1.7.1.1

[PATCH 2/2] regulator: tps51632: add DT support

[Laxman Dewangan]

Add DT support for the TI TPS51632. Add device binding document also.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
 .../bindings/regulator/tps51632-regulator.txt      |   27 +++++++++
 drivers/regulator/tps51632-regulator.c             |   59 ++++++++++++++++++++
 2 files changed, 86 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/regulator/tps51632-regulator.txt

diff --git a/Documentation/devicetree/bindings/regulator/tps51632-regulator.txt b/Documentation/devicetree/bindings/regulator/tps51632-regulator.txt
new file mode 100644
index 0000000..2f7e44a
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/tps51632-regulator.txt
@@ -0,0 +1,27 @@
+TPS51632 Voltage regulators
+
+Required properties:
+- compatible: Must be "ti,tps51632"
+- reg: I2C slave address
+
+Optional properties:
+- ti,enable-pwm-dvfs: Enable the DVFS voltage control through the PWM interface.
+- ti,dvfs-step-20mV: The 20mV step voltage when PWM DVFS enabled. Missing this
+	will set 10mV step voltage in PWM DVFS mode. In normal mode, the voltage
+	step is 10mV as per datasheet.
+
+Any property defined as part of the core regulator binding, defined in
+regulator.txt, can also be used.
+
+Example:
+
+	tps51632 {
+		compatible = "ti,tps51632";
+		reg =  <0x43>;
+		regulator-name = "tps51632-vout";
+		regulator-min-microvolt = <500000>;
+		regulator-max-microvolt = <1500000>;
+		regulator-boot-on;
+		ti,enable-pwm-dvfs;
+		ti,dvfs-step-20mV;
+	};
diff --git a/drivers/regulator/tps51632-regulator.c b/drivers/regulator/tps51632-regulator.c
index b96fb0e..a3af9c5 100644
--- a/drivers/regulator/tps51632-regulator.c
+++ b/drivers/regulator/tps51632-regulator.c
@@ -28,10 +28,13 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
 #include <linux/regulator/tps51632-regulator.h>
 #include <linux/slab.h>
 
@@ -252,6 +255,49 @@ static const struct regmap_config tps51632_regmap_config = {
 	.cache_type		= REGCACHE_RBTREE,
 };
 
+#if defined(CONFIG_OF)
+static const struct of_device_id tps51632_of_match[] = {
+	{ .compatible = "ti,tps51632",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, tps51632_of_match);
+
+static struct tps51632_regulator_platform_data *
+	of_get_tps51632_platform_data(struct device *dev)
+{
+	struct tps51632_regulator_platform_data *pdata;
+	struct device_node *np = dev->of_node;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		dev_err(dev, "Memory alloc failed for platform data\n");
+		return NULL;
+	}
+
+	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
+	if (!pdata->reg_init_data) {
+		dev_err(dev, "Not able to get OF regulator init data\n");
+		return NULL;
+	}
+
+	pdata->enable_pwm_dvfs =
+			of_property_read_bool(np, "ti,enable-pwm-dvfs");
+	pdata->dvfs_step_20mV = of_property_read_bool(np, "ti,dvfs-step-20mV");
+
+	pdata->base_voltage_uV = pdata->reg_init_data->constraints->min_uV ? :
+					TPS51632_MIN_VOLATGE;
+	pdata->max_voltage_uV = pdata->reg_init_data->constraints->max_uV ? :
+					TPS51632_MAX_VOLATGE;
+	return pdata;
+}
+#else
+static struct tps51632_regulator_platform_data *
+	of_get_tps51632_platform_data(struct device *dev)
+{
+	return NULL;
+}
+#endif
+
 static int tps51632_probe(struct i2c_client *client,
 				const struct i2c_device_id *id)
 {
@@ -261,7 +307,19 @@ static int tps51632_probe(struct i2c_client *client,
 	int ret;
 	struct regulator_config config = { };
 
+	if (client->dev.of_node) {
+		const struct of_device_id *match;
+		match = of_match_device(of_match_ptr(tps51632_of_match),
+				&client->dev);
+		if (!match) {
+			dev_err(&client->dev, "Error: No device match found\n");
+			return -ENODEV;
+		}
+	}
+
 	pdata = client->dev.platform_data;
+	if (!pdata && client->dev.of_node)
+		pdata = of_get_tps51632_platform_data(&client->dev);
 	if (!pdata) {
 		dev_err(&client->dev, "No Platform data\n");
 		return -EINVAL;
@@ -350,6 +408,7 @@ static struct i2c_driver tps51632_i2c_driver = {
 	.driver = {
 		.name = "tps51632",
 		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(tps51632_of_match),
 	},
 	.probe = tps51632_probe,
 	.remove = tps51632_remove,
-- 
1.7.1.1