[PATCH 0/3] regulator: merge s2mps11 and s2mpa01 drivers

[PATCH 0/3] regulator: merge s2mps11 and s2mpa01 drivers

[Krzysztof Kozlowski]

Hi,


The patchset merges s2mpa01 regulator driver into s2mps11. As a result
the s2mps11 supports:
 - S2MPA01
 - S2MPS11
 - S2MPS14

These PMIC-s are very similar to each other and they are often used
along with Samsung's Exynos SoCs. Merging this into one driver has
two benefits:
 - less code duplication,
 - one PMIC driver can be used in common Exynos default config.


The patchset was tested on Arndale Octa board with S2MPS11 PMIC. I am
kindly asking for testing on some board with S2MPA01.

Patches are rebased against current Mark Brown's regulator tree:
v3.15-rc5-41-g7c603c1c9e33


Best regards,
Krzysztof


Krzysztof Kozlowski (3):
  regulator: s2mps11: Refactor setting ramp delay
  regulator: s2mps11: Merge S2MPA01 driver
  regulator: s2mpa01: Remove driver because it was merged into s2mps11

 Documentation/devicetree/bindings/mfd/s2mpa01.txt |  90 ----
 Documentation/devicetree/bindings/mfd/s2mps11.txt | 106 +++--
 drivers/regulator/Kconfig                         |  11 +-
 drivers/regulator/Makefile                        |   1 -
 drivers/regulator/s2mpa01.c                       | 482 ---------------------
 drivers/regulator/s2mps11.c                       | 483 +++++++++++++++++-----
 6 files changed, 454 insertions(+), 719 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/mfd/s2mpa01.txt
 delete mode 100644 drivers/regulator/s2mpa01.c

-- 
1.9.1

[PATCH 1/3] regulator: s2mps11: Refactor setting ramp delay

[Krzysztof Kozlowski]

Prepare for merging the s2mpa01 regulator driver into s2mps11 by:
1. Adding common id for buck regulators.
2. Splitting shared ramp delay settings to match S2MPA01.
3. Adding a configuration of registers for setting ramp delay for each
   buck regulator.

The functionality of the driver should not change as this patch only
prepares for supporting S2MPA01 device.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
 drivers/regulator/s2mps11.c | 210 ++++++++++++++++++++++++++++++--------------
 1 file changed, 144 insertions(+), 66 deletions(-)

diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
index 02e2fb2fca66..fa12d75b784f 100644
--- a/drivers/regulator/s2mps11.c
+++ b/drivers/regulator/s2mps11.c
@@ -32,13 +32,32 @@
 #include <linux/mfd/samsung/s2mps11.h>
 #include <linux/mfd/samsung/s2mps14.h>
 
+/*
+ * Enum used as a common id of buck regulators on S2MPA01 and S2MPS11.
+ */
+enum s2mpx_bucks {
+	S2MPX_BUCK1,
+	S2MPX_BUCK2,
+	S2MPX_BUCK3,
+	S2MPX_BUCK4,
+	S2MPX_BUCK5,
+	S2MPX_BUCK6,
+	S2MPX_BUCK7,
+	S2MPX_BUCK8,
+	S2MPX_BUCK9,
+	S2MPX_BUCK10,
+};
+
 struct s2mps11_info {
+	enum sec_device_type dev_type;
 	unsigned int rdev_num;
 	int ramp_delay2;
-	int ramp_delay34;
+	int ramp_delay3;
+	int ramp_delay4;
 	int ramp_delay5;
 	int ramp_delay16;
-	int ramp_delay7810;
+	int ramp_delay7;
+	int ramp_delay810;
 	int ramp_delay9;
 	/*
 	 * One bit for each S2MPS14 regulator whether the suspend mode
@@ -49,6 +68,47 @@ struct s2mps11_info {
 	int *ext_control_gpio;
 };
 
+/*
+ * Description of ramp delay register for one buck regulator
+ * on S2MPA01 and S2MPS11.
+ */
+struct s2mpx_ramp_reg {
+	unsigned int ramp_shift;
+	unsigned int ramp_reg;
+	unsigned int enable_shift;
+	bool enable_supported;
+};
+
+#define s2mps11_ramp_reg(r_shift) {					\
+	.ramp_shift		= S2MPS11_ ## r_shift ## _RAMP_SHIFT,	\
+	.ramp_reg		= S2MPS11_REG_RAMP_BUCK,		\
+	.enable_shift		= 0,					\
+	.enable_supported	= false,				\
+}
+#define s2mps11_buck2346_ramp_reg(r_shift, r_reg, e_shift) {		\
+	.ramp_shift		= S2MPS11_ ## r_shift ## _RAMP_SHIFT,	\
+	.ramp_reg		= S2MPS11_REG_ ## r_reg,		\
+	.enable_shift		= S2MPS11_ ## e_shift ## _RAMP_EN_SHIFT,\
+	.enable_supported	= true,					\
+}
+
+static const struct s2mpx_ramp_reg s2mps11_ramp_regs[] = {
+	[S2MPX_BUCK1]	= s2mps11_ramp_reg(BUCK16),
+	[S2MPX_BUCK2]	= s2mps11_buck2346_ramp_reg(BUCK2, RAMP, BUCK2),
+	[S2MPX_BUCK3]	= s2mps11_buck2346_ramp_reg(BUCK34, RAMP, BUCK3),
+	[S2MPX_BUCK4]	= s2mps11_buck2346_ramp_reg(BUCK34, RAMP, BUCK4),
+	[S2MPX_BUCK5]	= s2mps11_ramp_reg(BUCK5),
+	[S2MPX_BUCK6]	= s2mps11_buck2346_ramp_reg(BUCK16, RAMP_BUCK, BUCK6),
+	[S2MPX_BUCK7]	= s2mps11_ramp_reg(BUCK7810),
+	[S2MPX_BUCK8]	= s2mps11_ramp_reg(BUCK7810),
+	[S2MPX_BUCK9]	= s2mps11_ramp_reg(BUCK9),
+	[S2MPX_BUCK10]	= s2mps11_ramp_reg(BUCK7810),
+};
+
+static const struct s2mpx_ramp_reg * const s2mpx_ramp_regs[] = {
+	[S2MPS11X] = s2mps11_ramp_regs,
+};
+
 static int get_ramp_delay(int ramp_delay)
 {
 	unsigned char cnt = 0;
@@ -68,6 +128,23 @@ static int get_ramp_delay(int ramp_delay)
 	return cnt;
 }
 
+/*
+ * Maps a buck regulator id to enum s2mpx_bucks.
+ * Valid only for buck regulators on on S2MPS11.
+ *
+ * Returns a value of enum s2mpx_bucks or -EINVAL.
+ */
+static int get_s2mpx_buck_id(enum sec_device_type dev_type,
+		int rdev_id)
+{
+	switch (dev_type) {
+	case S2MPS11X:
+		return rdev_id - S2MPS11_BUCK1;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int s2mps11_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 				   unsigned int old_selector,
 				   unsigned int new_selector)
@@ -75,29 +152,40 @@ static int s2mps11_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 	struct s2mps11_info *s2mps11 = rdev_get_drvdata(rdev);
 	unsigned int ramp_delay = 0;
 	int old_volt, new_volt;
+	int buck_id = get_s2mpx_buck_id(s2mps11->dev_type, rdev_get_id(rdev));
 
-	switch (rdev_get_id(rdev)) {
-	case S2MPS11_BUCK2:
+	switch (buck_id) {
+	case S2MPX_BUCK2:
 		ramp_delay = s2mps11->ramp_delay2;
 		break;
-	case S2MPS11_BUCK3:
-	case S2MPS11_BUCK4:
-		ramp_delay = s2mps11->ramp_delay34;
+	case S2MPX_BUCK3:
+		ramp_delay = s2mps11->ramp_delay3;
 		break;
-	case S2MPS11_BUCK5:
+	case S2MPX_BUCK4:
+		ramp_delay = s2mps11->ramp_delay4;
+		break;
+	case S2MPX_BUCK5:
 		ramp_delay = s2mps11->ramp_delay5;
 		break;
-	case S2MPS11_BUCK6:
-	case S2MPS11_BUCK1:
+	case S2MPX_BUCK6:
+	case S2MPX_BUCK1:
 		ramp_delay = s2mps11->ramp_delay16;
 		break;
-	case S2MPS11_BUCK7:
-	case S2MPS11_BUCK8:
-	case S2MPS11_BUCK10:
-		ramp_delay = s2mps11->ramp_delay7810;
+	case S2MPX_BUCK7:
+		ramp_delay = s2mps11->ramp_delay7;
 		break;
-	case S2MPS11_BUCK9:
+	case S2MPX_BUCK8:
+	case S2MPX_BUCK10:
+		ramp_delay = s2mps11->ramp_delay810;
+		break;
+	case S2MPX_BUCK9:
 		ramp_delay = s2mps11->ramp_delay9;
+		break;
+	default:
+		dev_err(rdev_get_dev(rdev),
+				"Wrong regulator id %d for set_voltage_time_sel\n",
+				rdev_get_id(rdev));
+		return -EINVAL;
 	}
 
 	if (ramp_delay == 0)
@@ -112,66 +200,55 @@ static int s2mps11_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 {
 	struct s2mps11_info *s2mps11 = rdev_get_drvdata(rdev);
-	unsigned int ramp_val, ramp_shift, ramp_reg = S2MPS11_REG_RAMP_BUCK;
-	unsigned int ramp_enable = 1, enable_shift = 0;
+	const struct s2mpx_ramp_reg *ramp_reg;
+	unsigned int ramp_val;
+	unsigned int ramp_enable = 1;
+	int buck_id;
 	int ret;
 
-	switch (rdev_get_id(rdev)) {
-	case S2MPS11_BUCK1:
+	buck_id = get_s2mpx_buck_id(s2mps11->dev_type, rdev_get_id(rdev));
+
+	switch (buck_id) {
+	case S2MPX_BUCK1:
 		if (ramp_delay > s2mps11->ramp_delay16)
 			s2mps11->ramp_delay16 = ramp_delay;
 		else
 			ramp_delay = s2mps11->ramp_delay16;
-
-		ramp_shift = S2MPS11_BUCK16_RAMP_SHIFT;
 		break;
-	case S2MPS11_BUCK2:
-		enable_shift = S2MPS11_BUCK2_RAMP_EN_SHIFT;
+	case S2MPX_BUCK2:
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
 		}
 
 		s2mps11->ramp_delay2 = ramp_delay;
-		ramp_shift = S2MPS11_BUCK2_RAMP_SHIFT;
-		ramp_reg = S2MPS11_REG_RAMP;
 		break;
-	case S2MPS11_BUCK3:
-		enable_shift = S2MPS11_BUCK3_RAMP_EN_SHIFT;
+	case S2MPX_BUCK3:
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
 		}
 
-		if (ramp_delay > s2mps11->ramp_delay34)
-			s2mps11->ramp_delay34 = ramp_delay;
+		if (ramp_delay > s2mps11->ramp_delay3)
+			s2mps11->ramp_delay3 = ramp_delay;
 		else
-			ramp_delay = s2mps11->ramp_delay34;
-
-		ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
-		ramp_reg = S2MPS11_REG_RAMP;
+			ramp_delay = s2mps11->ramp_delay3;
 		break;
 	case S2MPS11_BUCK4:
-		enable_shift = S2MPS11_BUCK4_RAMP_EN_SHIFT;
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
 		}
 
-		if (ramp_delay > s2mps11->ramp_delay34)
-			s2mps11->ramp_delay34 = ramp_delay;
+		if (ramp_delay > s2mps11->ramp_delay4)
+			s2mps11->ramp_delay4 = ramp_delay;
 		else
-			ramp_delay = s2mps11->ramp_delay34;
-
-		ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
-		ramp_reg = S2MPS11_REG_RAMP;
+			ramp_delay = s2mps11->ramp_delay4;
 		break;
 	case S2MPS11_BUCK5:
 		s2mps11->ramp_delay5 = ramp_delay;
-		ramp_shift = S2MPS11_BUCK5_RAMP_SHIFT;
 		break;
 	case S2MPS11_BUCK6:
-		enable_shift = S2MPS11_BUCK6_RAMP_EN_SHIFT;
 		if (!ramp_delay) {
 			ramp_enable = 0;
 			break;
@@ -181,36 +258,37 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 			s2mps11->ramp_delay16 = ramp_delay;
 		else
 			ramp_delay = s2mps11->ramp_delay16;
-
-		ramp_shift = S2MPS11_BUCK16_RAMP_SHIFT;
 		break;
 	case S2MPS11_BUCK7:
+		if (ramp_delay > s2mps11->ramp_delay7)
+			s2mps11->ramp_delay7 = ramp_delay;
+		else
+			ramp_delay = s2mps11->ramp_delay7;
+		break;
 	case S2MPS11_BUCK8:
 	case S2MPS11_BUCK10:
-		if (ramp_delay > s2mps11->ramp_delay7810)
-			s2mps11->ramp_delay7810 = ramp_delay;
+		if (ramp_delay > s2mps11->ramp_delay810)
+			s2mps11->ramp_delay810 = ramp_delay;
 		else
-			ramp_delay = s2mps11->ramp_delay7810;
-
-		ramp_shift = S2MPS11_BUCK7810_RAMP_SHIFT;
+			ramp_delay = s2mps11->ramp_delay810;
 		break;
 	case S2MPS11_BUCK9:
 		s2mps11->ramp_delay9 = ramp_delay;
-		ramp_shift = S2MPS11_BUCK9_RAMP_SHIFT;
 		break;
 	default:
 		return 0;
 	}
 
+	ramp_reg = &s2mpx_ramp_regs[s2mps11->dev_type][buck_id];
+
 	if (!ramp_enable)
 		goto ramp_disable;
 
 	/* Ramp delay can be enabled/disabled only for buck[2346] */
-	if ((rdev_get_id(rdev) >= S2MPS11_BUCK2 &&
-			rdev_get_id(rdev) <= S2MPS11_BUCK4) ||
-			rdev_get_id(rdev) == S2MPS11_BUCK6)  {
+	if (ramp_reg->enable_supported) {
 		ret = regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP,
-					 1 << enable_shift, 1 << enable_shift);
+					 1 << ramp_reg->enable_shift,
+					 1 << ramp_reg->enable_shift);
 		if (ret) {
 			dev_err(&rdev->dev, "failed to enable ramp rate\n");
 			return ret;
@@ -219,12 +297,13 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 
 	ramp_val = get_ramp_delay(ramp_delay);
 
-	return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
-				  ramp_val << ramp_shift);
+	return regmap_update_bits(rdev->regmap, ramp_reg->ramp_reg,
+				0x3 << ramp_reg->ramp_shift,
+				ramp_val << ramp_reg->ramp_shift);
 
 ramp_disable:
 	return regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP,
-				  1 << enable_shift, 0);
+				  1 << ramp_reg->enable_shift, 0);
 }
 
 static struct regulator_ops s2mps11_ldo_ops = {
@@ -250,7 +329,7 @@ static struct regulator_ops s2mps11_buck_ops = {
 	.set_ramp_delay		= s2mps11_set_ramp_delay,
 };
 
-#define regulator_desc_s2mps11_ldo1(num)	{		\
+#define regulator_desc_s2mps11_ldo1(num) {		\
 	.name		= "LDO"#num,			\
 	.id		= S2MPS11_LDO##num,		\
 	.ops		= &s2mps11_ldo_ops,		\
@@ -605,8 +684,7 @@ static void s2mps14_pmic_dt_parse_ext_control_gpio(struct platform_device *pdev,
 }
 
 static int s2mps11_pmic_dt_parse(struct platform_device *pdev,
-		struct of_regulator_match *rdata, struct s2mps11_info *s2mps11,
-		enum sec_device_type dev_type)
+		struct of_regulator_match *rdata, struct s2mps11_info *s2mps11)
 {
 	struct device_node *reg_np;
 
@@ -617,7 +695,7 @@ static int s2mps11_pmic_dt_parse(struct platform_device *pdev,
 	}
 
 	of_regulator_match(&pdev->dev, reg_np, rdata, s2mps11->rdev_num);
-	if (dev_type == S2MPS14X)
+	if (s2mps11->dev_type == S2MPS14X)
 		s2mps14_pmic_dt_parse_ext_control_gpio(pdev, rdata, s2mps11);
 
 	of_node_put(reg_np);
@@ -634,15 +712,14 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 	struct s2mps11_info *s2mps11;
 	int i, ret = 0;
 	const struct regulator_desc *regulators;
-	enum sec_device_type dev_type;
 
 	s2mps11 = devm_kzalloc(&pdev->dev, sizeof(struct s2mps11_info),
 				GFP_KERNEL);
 	if (!s2mps11)
 		return -ENOMEM;
 
-	dev_type = platform_get_device_id(pdev)->driver_data;
-	switch (dev_type) {
+	s2mps11->dev_type = platform_get_device_id(pdev)->driver_data;
+	switch (s2mps11->dev_type) {
 	case S2MPS11X:
 		s2mps11->rdev_num = ARRAY_SIZE(s2mps11_regulators);
 		regulators = s2mps11_regulators;
@@ -652,7 +729,8 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 		regulators = s2mps14_regulators;
 		break;
 	default:
-		dev_err(&pdev->dev, "Invalid device type: %u\n", dev_type);
+		dev_err(&pdev->dev, "Invalid device type: %u\n",
+				s2mps11->dev_type);
 		return -EINVAL;
 	};
 
@@ -686,7 +764,7 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 	for (i = 0; i < s2mps11->rdev_num; i++)
 		rdata[i].name = regulators[i].name;
 
-	ret = s2mps11_pmic_dt_parse(pdev, rdata, s2mps11, dev_type);
+	ret = s2mps11_pmic_dt_parse(pdev, rdata, s2mps11);
 	if (ret)
 		goto out;
 
-- 
1.9.1

[PATCH 2/3] regulator: s2mps11: Merge S2MPA01 driver

[Krzysztof Kozlowski]

Add S2MPA01 support to the s2mps11 regulator driver. This obsoletes the
s2mpa01 regulator driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
 Documentation/devicetree/bindings/mfd/s2mps11.txt | 106 ++++----
 drivers/regulator/Kconfig                         |   4 +-
 drivers/regulator/s2mps11.c                       | 283 +++++++++++++++++++---
 3 files changed, 315 insertions(+), 78 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt
index d81ba30c0d8b..63f9b0d7982a 100644
--- a/Documentation/devicetree/bindings/mfd/s2mps11.txt
+++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt
@@ -1,5 +1,5 @@
 
-* Samsung S2MPS11 and S2MPS14 Voltage and Current Regulator
+* Samsung S2MPA01, S2MPS11 and S2MPS14 Voltage and Current Regulator
 
 The Samsung S2MPS11 is a multi-function device which includes voltage and
 current regulators, RTC, charger controller and other sub-blocks. It is
@@ -7,21 +7,23 @@ interfaced to the host controller using an I2C interface. Each sub-block is
 addressed by the host system using different I2C slave addresses.
 
 Required properties:
-- compatible: Should be "samsung,s2mps11-pmic" or "samsung,s2mps14-pmic".
+- compatible: Should be one of: "samsung,s2mps11-pmic", "samsung,s2mps14-pmic",
+              "samsung,s2mpa01-pmic".
 - reg: Specifies the I2C slave address of the pmic block. It should be 0x66.
 
 Optional properties:
 - interrupt-parent: Specifies the phandle of the interrupt controller to which
   the interrupts from s2mps11 are delivered to.
-- interrupts: Interrupt specifiers for interrupt sources.
+- interrupts: An interrupt specifier for the sole interrupt generated by the
+  device.
 
 Optional nodes:
-- clocks: s2mps11 and s5m8767 provide three(AP/CP/BT) buffered 32.768 KHz
+- clocks: S2MPS11 and S5M8767 provide three(AP/CP/BT) buffered 32.768 KHz
   outputs, so to register these as clocks with common clock framework
   instantiate a sub-node named "clocks". It uses the common clock binding
   documented in :
   [Documentation/devicetree/bindings/clock/clock-bindings.txt]
-  The s2mps14 provides two (AP/BT) buffered 32.768 KHz outputs.
+  The S2MPS14 provides two (AP/BT) buffered 32.768 KHz outputs.
   - #clock-cells: should be 1.
 
   - The following is the list of clocks generated by the controller. Each clock
@@ -34,7 +36,8 @@ Optional nodes:
     32KhzBT		2            S2MPS11, S2MPS14, S5M8767
 
   - compatible: Should be one of: "samsung,s2mps11-clk", "samsung,s2mps14-clk",
-		"samsung,s5m8767-clk"
+                "samsung,s5m8767-clk"
+
 
 - regulators: The regulators of s2mps11 that have to be instantiated should be
 included in a sub-node named 'regulators'. Regulator nodes included in this
@@ -44,24 +47,61 @@ sub-node should be of the format as listed below.
 		[standard regulator constraints....];
 	};
 
- regulator-ramp-delay for BUCKs = [6250/12500/25000(default)/50000] uV/us
-
- BUCK[2/3/4/6] supports disabling ramp delay on hardware, so explictly
- regulator-ramp-delay = <0> can be used for them to disable ramp delay.
- In the absence of the regulator-ramp-delay property, the default ramp
- delay will be used.
-
-NOTE: Some BUCKs share the ramp rate setting i.e. same ramp value will be set
-for a particular group of BUCKs. So provide same regulator-ramp-delay<value>.
-Grouping of BUCKs sharing ramp rate setting is as follow : BUCK[1, 6],
-BUCK[3, 4], and BUCK[7, 8, 10]
-
-On S2MPS14 the LDO10, LDO11 and LDO12 can be configured to external control
-over GPIO. To turn this feature on this property must be added to the regulator
-sub-node:
-	- samsung,ext-control-gpios: GPIO specifier for one GPIO
-		controlling this regulator (enable/disable);
-Example:
+  The regulator constraints inside the regulator nodes use the standard
+  regulator bindings which are documented elsewhere.
+
+  The following are the names of the regulators that the s2mps11 pmic block
+  supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
+  as per the datasheet of S2MPA01/S2MPS11/S2MPS14.
+
+  - LDOn
+    - valid values for n are:
+      - S2MPA01: 1 to 26
+      - S2MPS11: 1 to 38
+      - S2MPS14: 1 to 25
+    - Example: LDO1, LDO2, LDO28
+
+  - BUCKn
+    - valid values for n are:
+      - S2MPA01: 1 to 10
+      - S2MPS11: 1 to 10
+      - S2MPS14: 1 to 5
+    - Example: BUCK1, BUCK2, BUCK9
+
+  Properties for BUCK regulator nodes, only on S2MPA01 and S2MPS11:
+  - regulator-ramp-delay: ramp delay in uV/us. May be 6250, 12500, 25000
+    or 50000. May be 0 for disabling the ramp delay when this is supported.
+
+    NOTE: Some BUCKs share the ramp rate setting i.e. same ramp value will
+    be set for a particular group of BUCKs. So provide same
+    regulator-ramp-delay=<value>.
+
+    - S2MPA01:
+      Default ramp delay: 12500
+      Ramp delay can be disabled for BUCK{1,2,3,4}.
+      BUCKs sharing ramp settings:
+      - 1 and 6
+      - 2 and 4
+      - 8, 9 and 10
+
+    - S2MPS11:
+      Default ramp delay: 25000
+      Ramp delay can be disabled for BUCK{2,3,4,6}.
+      BUCKs sharing ramp settings:
+      - 1 and 6
+      - 3 and 4
+      - 7, 8 and 9
+
+    In the absence of the regulator-ramp-delay property, the default ramp
+    delay will be used.
+
+  Properties for regulator nodes, only on S2MPS14:
+  - samsung,ext-control-gpios: GPIO specifier for one GPIO
+    controlling this regulator (enable/disable);
+
+    On S2MPS14 the LDO10, LDO11 and LDO12 can be configured to external
+    control over GPIO.
+    Example:
 	LDO12 {
 		regulator-name = "V_EMMC_2.8V";
 		regulator-min-microvolt = <2800000>;
@@ -70,24 +110,6 @@ Example:
 	};
 
 
-The regulator constraints inside the regulator nodes use the standard regulator
-bindings which are documented elsewhere.
-
-The following are the names of the regulators that the s2mps11 pmic block
-supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
-as per the datasheet of s2mps11.
-
-	- LDOn
-		  - valid values for n are:
-			- S2MPS11: 1 to 38
-			- S2MPS14: 1 to 25
-		  - Example: LDO1, LD02, LDO28
-	- BUCKn
-		  - valid values for n are:
-			- S2MPS11: 1 to 10
-			- S2MPS14: 1 to 5
-		  - Example: BUCK1, BUCK2, BUCK9
-
 Example:
 
 	s2mps11_pmic@66 {
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 65e5d7d1b35a..c4aa87fd12af 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -448,10 +448,10 @@ config REGULATOR_S2MPA01
 	 via I2C bus. S2MPA01 has 10 Bucks and 26 LDO outputs.
 
 config REGULATOR_S2MPS11
-	tristate "Samsung S2MPS11/S2MPS14 voltage regulator"
+	tristate "Samsung S2MPA01/S2MPS11/S2MPS14 voltage regulator"
 	depends on MFD_SEC_CORE
 	help
-	 This driver supports a Samsung S2MPS11/S2MPS14 voltage output
+	 This driver supports a Samsung S2MPA01/S2MPS11/S2MPS14 voltage output
 	 regulator via I2C bus. The chip is comprised of high efficient Buck
 	 converters including Dual-Phase Buck converter, Buck-Boost converter,
 	 various LDOs.
diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
index fa12d75b784f..701fd6a687b9 100644
--- a/drivers/regulator/s2mps11.c
+++ b/drivers/regulator/s2mps11.c
@@ -3,6 +3,10 @@
  *
  * Copyright (c) 2012-2014 Samsung Electronics Co., Ltd
  *              http://www.samsung.com
+ * Authors:
+ * - Original driver: Sangbeom Kim <sbkim73@samsung.com>
+ * - Support for S2MPS14: Krzysztof Kozlowski <k.kozlowski@samsung.com>
+ * - Support for S2MPA01 based on work by Sachin Kamat <sachin.kamat@linaro.org>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
@@ -29,6 +33,7 @@
 #include <linux/regulator/of_regulator.h>
 #include <linux/of_gpio.h>
 #include <linux/mfd/samsung/core.h>
+#include <linux/mfd/samsung/s2mpa01.h>
 #include <linux/mfd/samsung/s2mps11.h>
 #include <linux/mfd/samsung/s2mps14.h>
 
@@ -105,7 +110,34 @@ static const struct s2mpx_ramp_reg s2mps11_ramp_regs[] = {
 	[S2MPX_BUCK10]	= s2mps11_ramp_reg(BUCK7810),
 };
 
+#define s2mpa01_ramp_reg(r_shift) {					\
+	.ramp_shift		= S2MPA01_ ## r_shift ## _RAMP_SHIFT,	\
+	.ramp_reg		= S2MPA01_REG_RAMP2,			\
+	.enable_shift		= 0,					\
+	.enable_supported	= false,				\
+}
+#define s2mpa01_buck1234_ramp_reg(r_shift, r_reg, e_shift) {		\
+	.ramp_shift		= S2MPA01_ ## r_shift ## _RAMP_SHIFT,	\
+	.ramp_reg		= S2MPA01_REG_ ## r_reg,		\
+	.enable_shift		= S2MPA01_ ## e_shift ## _RAMP_EN_SHIFT,\
+	.enable_supported	= true,					\
+}
+
+static const struct s2mpx_ramp_reg s2mpa01_ramp_regs[] = {
+	[S2MPX_BUCK1]	= s2mpa01_buck1234_ramp_reg(BUCK16, RAMP2, BUCK1),
+	[S2MPX_BUCK2]	= s2mpa01_buck1234_ramp_reg(BUCK24, RAMP1, BUCK2),
+	[S2MPX_BUCK3]	= s2mpa01_buck1234_ramp_reg(BUCK3, RAMP1, BUCK3),
+	[S2MPX_BUCK4]	= s2mpa01_buck1234_ramp_reg(BUCK24, RAMP1, BUCK4),
+	[S2MPX_BUCK5]	= s2mpa01_ramp_reg(BUCK5),
+	[S2MPX_BUCK6]	= s2mpa01_ramp_reg(BUCK16),
+	[S2MPX_BUCK7]	= s2mpa01_ramp_reg(BUCK7),
+	[S2MPX_BUCK8]	= s2mpa01_ramp_reg(BUCK8910),
+	[S2MPX_BUCK9]	= s2mpa01_ramp_reg(BUCK8910),
+	[S2MPX_BUCK10]	= s2mpa01_ramp_reg(BUCK8910),
+};
+
 static const struct s2mpx_ramp_reg * const s2mpx_ramp_regs[] = {
+	[S2MPA01] = s2mpa01_ramp_regs,
 	[S2MPS11X] = s2mps11_ramp_regs,
 };
 
@@ -138,6 +170,8 @@ static int get_s2mpx_buck_id(enum sec_device_type dev_type,
 		int rdev_id)
 {
 	switch (dev_type) {
+	case S2MPA01:
+		return rdev_id - S2MPA01_BUCK1;
 	case S2MPS11X:
 		return rdev_id - S2MPS11_BUCK1;
 	default:
@@ -202,7 +236,7 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 	struct s2mps11_info *s2mps11 = rdev_get_drvdata(rdev);
 	const struct s2mpx_ramp_reg *ramp_reg;
 	unsigned int ramp_val;
-	unsigned int ramp_enable = 1;
+	unsigned int ramp_disable = !ramp_delay;
 	int buck_id;
 	int ret;
 
@@ -216,30 +250,20 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 			ramp_delay = s2mps11->ramp_delay16;
 		break;
 	case S2MPX_BUCK2:
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
-		s2mps11->ramp_delay2 = ramp_delay;
+		if (s2mps11->dev_type == S2MPS11X ||
+				ramp_delay > s2mps11->ramp_delay2)
+			s2mps11->ramp_delay2 = ramp_delay;
+		else /* S2MPA01 && ramp_delay <= s2mpa01->ramp_delay24 */
+			ramp_delay = s2mps11->ramp_delay2;
 		break;
 	case S2MPX_BUCK3:
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
-		if (ramp_delay > s2mps11->ramp_delay3)
+		if (s2mps11->dev_type == S2MPA01 ||
+				ramp_delay > s2mps11->ramp_delay3)
 			s2mps11->ramp_delay3 = ramp_delay;
-		else
+		else /* S2MPS11 && ramp_delay <= s2mpa01->ramp_delay3 */
 			ramp_delay = s2mps11->ramp_delay3;
 		break;
 	case S2MPS11_BUCK4:
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
 		if (ramp_delay > s2mps11->ramp_delay4)
 			s2mps11->ramp_delay4 = ramp_delay;
 		else
@@ -249,20 +273,16 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 		s2mps11->ramp_delay5 = ramp_delay;
 		break;
 	case S2MPS11_BUCK6:
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
 		if (ramp_delay > s2mps11->ramp_delay16)
 			s2mps11->ramp_delay16 = ramp_delay;
 		else
 			ramp_delay = s2mps11->ramp_delay16;
 		break;
 	case S2MPS11_BUCK7:
-		if (ramp_delay > s2mps11->ramp_delay7)
+		if (s2mps11->dev_type == S2MPA01 ||
+				ramp_delay > s2mps11->ramp_delay7)
 			s2mps11->ramp_delay7 = ramp_delay;
-		else
+		else /* S2MPS11 && ramp_delay <= s2mpa01->ramp_delay7 */
 			ramp_delay = s2mps11->ramp_delay7;
 		break;
 	case S2MPS11_BUCK8:
@@ -273,7 +293,11 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 			ramp_delay = s2mps11->ramp_delay810;
 		break;
 	case S2MPS11_BUCK9:
-		s2mps11->ramp_delay9 = ramp_delay;
+		if (s2mps11->dev_type == S2MPS11X ||
+				ramp_delay > s2mps11->ramp_delay9)
+			s2mps11->ramp_delay9 = ramp_delay;
+		else /* S2MPA01 && ramp_delay <= s2mpa01->ramp_delay9 */
+			ramp_delay = s2mps11->ramp_delay9;
 		break;
 	default:
 		return 0;
@@ -281,11 +305,10 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 
 	ramp_reg = &s2mpx_ramp_regs[s2mps11->dev_type][buck_id];
 
-	if (!ramp_enable)
-		goto ramp_disable;
-
-	/* Ramp delay can be enabled/disabled only for buck[2346] */
 	if (ramp_reg->enable_supported) {
+		if (ramp_disable)
+			goto ramp_disable;
+
 		ret = regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP,
 					 1 << ramp_reg->enable_shift,
 					 1 << ramp_reg->enable_shift);
@@ -654,6 +677,193 @@ static const struct regulator_desc s2mps14_regulators[] = {
 	regulator_desc_s2mps14_buck1235(5),
 };
 
+static struct regulator_ops s2mpa01_ldo_ops = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
+};
+
+static struct regulator_ops s2mpa01_buck_ops = {
+	.list_voltage		= regulator_list_voltage_linear,
+	.map_voltage		= regulator_map_voltage_linear,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
+	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
+	.set_voltage_time_sel	= s2mps11_regulator_set_voltage_time_sel,
+	.set_ramp_delay		= s2mps11_set_ramp_delay,
+};
+
+#define regulator_desc_s2mpa01_ldo1(num) {		\
+	.name		= "LDO"#num,			\
+	.id		= S2MPA01_LDO##num,		\
+	.ops		= &s2mpa01_ldo_ops,		\
+	.type		= REGULATOR_VOLTAGE,		\
+	.owner		= THIS_MODULE,			\
+	.min_uV		= S2MPA01_LDO_MIN,		\
+	.uV_step	= S2MPA01_LDO_STEP1,		\
+	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
+	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
+	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK		\
+}
+#define regulator_desc_s2mpa01_ldo2(num) {		\
+	.name		= "LDO"#num,			\
+	.id		= S2MPA01_LDO##num,		\
+	.ops		= &s2mpa01_ldo_ops,		\
+	.type		= REGULATOR_VOLTAGE,		\
+	.owner		= THIS_MODULE,			\
+	.min_uV		= S2MPA01_LDO_MIN,		\
+	.uV_step	= S2MPA01_LDO_STEP2,		\
+	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
+	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
+	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK		\
+}
+
+#define regulator_desc_s2mpa01_buck1_4(num) {			\
+	.name		= "BUCK"#num,				\
+	.id		= S2MPA01_BUCK##num,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN1,			\
+	.uV_step	= S2MPA01_BUCK_STEP1,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B1CTRL2 + (num - 1) * 2,	\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B1CTRL1 + (num - 1) * 2,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_s2mpa01_buck5 {				\
+	.name		= "BUCK5",				\
+	.id		= S2MPA01_BUCK5,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN2,			\
+	.uV_step	= S2MPA01_BUCK_STEP1,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B5CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B5CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_s2mpa01_buck6_7(num) {			\
+	.name		= "BUCK"#num,				\
+	.id		= S2MPA01_BUCK##num,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN1,			\
+	.uV_step	= S2MPA01_BUCK_STEP1,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B6CTRL2 + (num - 6) * 2,	\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B6CTRL1 + (num - 6) * 2,	\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_s2mpa01_buck8 {				\
+	.name		= "BUCK8",				\
+	.id		= S2MPA01_BUCK8,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN2,			\
+	.uV_step	= S2MPA01_BUCK_STEP2,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B8CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B8CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_s2mpa01_buck9 {				\
+	.name		= "BUCK9",				\
+	.id		= S2MPA01_BUCK9,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN4,			\
+	.uV_step	= S2MPA01_BUCK_STEP2,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B9CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B9CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+#define regulator_desc_s2mpa01_buck10 {				\
+	.name		= "BUCK10",				\
+	.id		= S2MPA01_BUCK10,			\
+	.ops		= &s2mpa01_buck_ops,			\
+	.type		= REGULATOR_VOLTAGE,			\
+	.owner		= THIS_MODULE,				\
+	.min_uV		= S2MPA01_BUCK_MIN3,			\
+	.uV_step	= S2MPA01_BUCK_STEP2,			\
+	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
+	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
+	.vsel_reg	= S2MPA01_REG_B10CTRL2,			\
+	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
+	.enable_reg	= S2MPA01_REG_B10CTRL1,			\
+	.enable_mask	= S2MPA01_ENABLE_MASK			\
+}
+
+static struct regulator_desc s2mpa01_regulators[] = {
+	regulator_desc_s2mpa01_ldo2(1),
+	regulator_desc_s2mpa01_ldo1(2),
+	regulator_desc_s2mpa01_ldo1(3),
+	regulator_desc_s2mpa01_ldo1(4),
+	regulator_desc_s2mpa01_ldo1(5),
+	regulator_desc_s2mpa01_ldo2(6),
+	regulator_desc_s2mpa01_ldo1(7),
+	regulator_desc_s2mpa01_ldo1(8),
+	regulator_desc_s2mpa01_ldo1(9),
+	regulator_desc_s2mpa01_ldo1(10),
+	regulator_desc_s2mpa01_ldo2(11),
+	regulator_desc_s2mpa01_ldo1(12),
+	regulator_desc_s2mpa01_ldo1(13),
+	regulator_desc_s2mpa01_ldo1(14),
+	regulator_desc_s2mpa01_ldo1(15),
+	regulator_desc_s2mpa01_ldo1(16),
+	regulator_desc_s2mpa01_ldo1(17),
+	regulator_desc_s2mpa01_ldo1(18),
+	regulator_desc_s2mpa01_ldo1(19),
+	regulator_desc_s2mpa01_ldo1(20),
+	regulator_desc_s2mpa01_ldo1(21),
+	regulator_desc_s2mpa01_ldo2(22),
+	regulator_desc_s2mpa01_ldo2(23),
+	regulator_desc_s2mpa01_ldo1(24),
+	regulator_desc_s2mpa01_ldo1(25),
+	regulator_desc_s2mpa01_ldo1(26),
+	regulator_desc_s2mpa01_buck1_4(1),
+	regulator_desc_s2mpa01_buck1_4(2),
+	regulator_desc_s2mpa01_buck1_4(3),
+	regulator_desc_s2mpa01_buck1_4(4),
+	regulator_desc_s2mpa01_buck5,
+	regulator_desc_s2mpa01_buck6_7(6),
+	regulator_desc_s2mpa01_buck6_7(7),
+	regulator_desc_s2mpa01_buck8,
+	regulator_desc_s2mpa01_buck9,
+	regulator_desc_s2mpa01_buck10,
+};
+
 static int s2mps14_pmic_enable_ext_control(struct s2mps11_info *s2mps11,
 		struct regulator_dev *rdev)
 {
@@ -713,13 +923,16 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 	int i, ret = 0;
 	const struct regulator_desc *regulators;
 
-	s2mps11 = devm_kzalloc(&pdev->dev, sizeof(struct s2mps11_info),
-				GFP_KERNEL);
+	s2mps11 = devm_kzalloc(&pdev->dev, sizeof(*s2mps11), GFP_KERNEL);
 	if (!s2mps11)
 		return -ENOMEM;
 
 	s2mps11->dev_type = platform_get_device_id(pdev)->driver_data;
 	switch (s2mps11->dev_type) {
+	case S2MPA01:
+		s2mps11->rdev_num = ARRAY_SIZE(s2mpa01_regulators);
+		regulators = s2mpa01_regulators;
+		break;
 	case S2MPS11X:
 		s2mps11->rdev_num = ARRAY_SIZE(s2mps11_regulators);
 		regulators = s2mps11_regulators;
@@ -817,6 +1030,7 @@ out:
 static const struct platform_device_id s2mps11_pmic_id[] = {
 	{ "s2mps11-pmic", S2MPS11X},
 	{ "s2mps14-pmic", S2MPS14X},
+	{ "s2mpa01-pmic", S2MPA01},
 	{ },
 };
 MODULE_DEVICE_TABLE(platform, s2mps11_pmic_id);
@@ -844,5 +1058,6 @@ module_exit(s2mps11_pmic_exit);
 
 /* Module information */
 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
-MODULE_DESCRIPTION("SAMSUNG S2MPS11/S2MPS14 Regulator Driver");
+MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
+MODULE_DESCRIPTION("SAMSUNG S2MPA01/S2MPS11/S2MPS14 Regulator Driver");
 MODULE_LICENSE("GPL");
-- 
1.9.1

[PATCH 3/3] regulator: s2mpa01: Remove driver because it was merged into s2mps11

[Krzysztof Kozlowski]

The s2mpa01 regulator driver can be safely removed since it was merged
into s2mps11 driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
---
 Documentation/devicetree/bindings/mfd/s2mpa01.txt |  90 ----
 drivers/regulator/Kconfig                         |   7 -
 drivers/regulator/Makefile                        |   1 -
 drivers/regulator/s2mpa01.c                       | 482 ----------------------
 4 files changed, 580 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/mfd/s2mpa01.txt
 delete mode 100644 drivers/regulator/s2mpa01.c

diff --git a/Documentation/devicetree/bindings/mfd/s2mpa01.txt b/Documentation/devicetree/bindings/mfd/s2mpa01.txt
deleted file mode 100644
index c13d3d8c3947..000000000000
--- a/Documentation/devicetree/bindings/mfd/s2mpa01.txt
+++ /dev/null
@@ -1,90 +0,0 @@
-
-* Samsung S2MPA01 Voltage and Current Regulator
-
-The Samsung S2MPA01 is a multi-function device which includes high
-efficiency buck converters including Dual-Phase buck converter, various LDOs,
-and an RTC. It is interfaced to the host controller using an I2C interface.
-Each sub-block is addressed by the host system using different I2C slave
-addresses.
-
-Required properties:
-- compatible: Should be "samsung,s2mpa01-pmic".
-- reg: Specifies the I2C slave address of the PMIC block. It should be 0x66.
-
-Optional properties:
-- interrupt-parent: Specifies the phandle of the interrupt controller to which
-  the interrupts from s2mpa01 are delivered to.
-- interrupts: An interrupt specifier for the sole interrupt generated by the
-  device.
-
-Optional nodes:
-- regulators: The regulators of s2mpa01 that have to be instantiated should be
-  included in a sub-node named 'regulators'. Regulator nodes and constraints
-  included in this sub-node use the standard regulator bindings which are
-  documented elsewhere.
-
-Properties for BUCK regulator nodes:
-- regulator-ramp-delay: ramp delay in uV/us. May be 6250, 12500
-  (default), 25000, or 50000. May be 0 for disabling the ramp delay on
-  BUCK{1,2,3,4}.
-
- In the absence of the regulator-ramp-delay property, the default ramp
- delay will be used.
-
-  NOTE: Some BUCKs share the ramp rate setting i.e. same ramp value will be set
-  for a particular group of BUCKs. So provide same regulator-ramp-delay=<value>.
-
-  The following BUCKs share ramp settings:
-  * 1 and 6
-  * 2 and 4
-  * 8, 9, and 10
-
-The following are the names of the regulators that the s2mpa01 PMIC block
-supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
-as per the datasheet of s2mpa01.
-
-	- LDOn
-		  - valid values for n are 1 to 26
-		  - Example: LDO1, LD02, LDO26
-	- BUCKn
-		  - valid values for n are 1 to 10.
-		  - Example: BUCK1, BUCK2, BUCK9
-
-Example:
-
-	s2mpa01_pmic@66 {
-		compatible = "samsung,s2mpa01-pmic";
-		reg = <0x66>;
-
-		regulators {
-			ldo1_reg: LDO1 {
-				regulator-name = "VDD_ALIVE";
-				regulator-min-microvolt = <1000000>;
-				regulator-max-microvolt = <1000000>;
-			};
-
-			ldo2_reg: LDO2 {
-				regulator-name = "VDDQ_MMC2";
-				regulator-min-microvolt = <2800000>;
-				regulator-max-microvolt = <2800000>;
-				regulator-always-on;
-			};
-
-			buck1_reg: BUCK1 {
-				regulator-name = "vdd_mif";
-				regulator-min-microvolt = <950000>;
-				regulator-max-microvolt = <1350000>;
-				regulator-always-on;
-				regulator-boot-on;
-			};
-
-			buck2_reg: BUCK2 {
-				regulator-name = "vdd_arm";
-				regulator-min-microvolt = <950000>;
-				regulator-max-microvolt = <1350000>;
-				regulator-always-on;
-				regulator-boot-on;
-				regulator-ramp-delay = <50000>;
-			};
-		};
-	};
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index c4aa87fd12af..d735ffb36c21 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -440,13 +440,6 @@ config REGULATOR_RC5T583
 	  through regulator interface. The device supports multiple DCDC/LDO
 	  outputs which can be controlled by i2c communication.
 
-config REGULATOR_S2MPA01
-	tristate "Samsung S2MPA01 voltage regulator"
-	depends on MFD_SEC_CORE
-	help
-	 This driver controls Samsung S2MPA01 voltage output regulator
-	 via I2C bus. S2MPA01 has 10 Bucks and 26 LDO outputs.
-
 config REGULATOR_S2MPS11
 	tristate "Samsung S2MPA01/S2MPS11/S2MPS14 voltage regulator"
 	depends on MFD_SEC_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index c14696b290c0..f479b91e7a32 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -60,7 +60,6 @@ obj-$(CONFIG_REGULATOR_PBIAS) += pbias-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_RC5T583)  += rc5t583-regulator.o
-obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_REGULATOR_ST_PWM) += st-pwm.o
diff --git a/drivers/regulator/s2mpa01.c b/drivers/regulator/s2mpa01.c
deleted file mode 100644
index ee83b4876420..000000000000
--- a/drivers/regulator/s2mpa01.c
+++ /dev/null
@@ -1,482 +0,0 @@
-/*
- * Copyright (c) 2013 Samsung Electronics Co., Ltd
- *		http://www.samsung.com
- *
- *  This program is free software; you can redistribute  it and/or modify it
- *  under  the terms of  the GNU General  Public License as published by the
- *  Free Software Foundation;  either version 2 of the  License, or (at your
- *  option) any later version.
- *
- */
-
-#include <linux/bug.h>
-#include <linux/err.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/regmap.h>
-#include <linux/platform_device.h>
-#include <linux/regulator/driver.h>
-#include <linux/regulator/machine.h>
-#include <linux/regulator/of_regulator.h>
-#include <linux/mfd/samsung/core.h>
-#include <linux/mfd/samsung/s2mpa01.h>
-
-#define S2MPA01_REGULATOR_CNT ARRAY_SIZE(regulators)
-
-struct s2mpa01_info {
-	int ramp_delay24;
-	int ramp_delay3;
-	int ramp_delay5;
-	int ramp_delay16;
-	int ramp_delay7;
-	int ramp_delay8910;
-};
-
-static int get_ramp_delay(int ramp_delay)
-{
-	unsigned char cnt = 0;
-
-	ramp_delay /= 6250;
-
-	while (true) {
-		ramp_delay = ramp_delay >> 1;
-		if (ramp_delay == 0)
-			break;
-		cnt++;
-	}
-
-	if (cnt > 3)
-		cnt = 3;
-
-	return cnt;
-}
-
-static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
-				   unsigned int old_selector,
-				   unsigned int new_selector)
-{
-	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
-	unsigned int ramp_delay = 0;
-	int old_volt, new_volt;
-
-	switch (rdev_get_id(rdev)) {
-	case S2MPA01_BUCK2:
-	case S2MPA01_BUCK4:
-		ramp_delay = s2mpa01->ramp_delay24;
-		break;
-	case S2MPA01_BUCK3:
-		ramp_delay = s2mpa01->ramp_delay3;
-		break;
-	case S2MPA01_BUCK5:
-		ramp_delay = s2mpa01->ramp_delay5;
-		break;
-	case S2MPA01_BUCK1:
-	case S2MPA01_BUCK6:
-		ramp_delay = s2mpa01->ramp_delay16;
-		break;
-	case S2MPA01_BUCK7:
-		ramp_delay = s2mpa01->ramp_delay7;
-		break;
-	case S2MPA01_BUCK8:
-	case S2MPA01_BUCK9:
-	case S2MPA01_BUCK10:
-		ramp_delay = s2mpa01->ramp_delay8910;
-		break;
-	}
-
-	if (ramp_delay == 0)
-		ramp_delay = rdev->desc->ramp_delay;
-
-	old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
-	new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);
-
-	return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
-}
-
-static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
-{
-	struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
-	unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
-	unsigned int ramp_enable = 1, enable_shift = 0;
-	int ret;
-
-	switch (rdev_get_id(rdev)) {
-	case S2MPA01_BUCK1:
-		enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
-		if (ramp_delay > s2mpa01->ramp_delay16)
-			s2mpa01->ramp_delay16 = ramp_delay;
-		else
-			ramp_delay = s2mpa01->ramp_delay16;
-
-		ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
-		break;
-	case S2MPA01_BUCK2:
-		enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
-		if (ramp_delay > s2mpa01->ramp_delay24)
-			s2mpa01->ramp_delay24 = ramp_delay;
-		else
-			ramp_delay = s2mpa01->ramp_delay24;
-
-		ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
-		ramp_reg = S2MPA01_REG_RAMP1;
-		break;
-	case S2MPA01_BUCK3:
-		enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
-		s2mpa01->ramp_delay3 = ramp_delay;
-		ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
-		ramp_reg = S2MPA01_REG_RAMP1;
-		break;
-	case S2MPA01_BUCK4:
-		enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
-		if (!ramp_delay) {
-			ramp_enable = 0;
-			break;
-		}
-
-		if (ramp_delay > s2mpa01->ramp_delay24)
-			s2mpa01->ramp_delay24 = ramp_delay;
-		else
-			ramp_delay = s2mpa01->ramp_delay24;
-
-		ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
-		ramp_reg = S2MPA01_REG_RAMP1;
-		break;
-	case S2MPA01_BUCK5:
-		s2mpa01->ramp_delay5 = ramp_delay;
-		ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
-		break;
-	case S2MPA01_BUCK6:
-		if (ramp_delay > s2mpa01->ramp_delay16)
-			s2mpa01->ramp_delay16 = ramp_delay;
-		else
-			ramp_delay = s2mpa01->ramp_delay16;
-
-		ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
-		break;
-	case S2MPA01_BUCK7:
-		s2mpa01->ramp_delay7 = ramp_delay;
-		ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
-		break;
-	case S2MPA01_BUCK8:
-	case S2MPA01_BUCK9:
-	case S2MPA01_BUCK10:
-		if (ramp_delay > s2mpa01->ramp_delay8910)
-			s2mpa01->ramp_delay8910 = ramp_delay;
-		else
-			ramp_delay = s2mpa01->ramp_delay8910;
-
-		ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
-		break;
-	default:
-		return 0;
-	}
-
-	if (!ramp_enable)
-		goto ramp_disable;
-
-	/* Ramp delay can be enabled/disabled only for buck[1234] */
-	if (rdev_get_id(rdev) >= S2MPA01_BUCK1 &&
-			rdev_get_id(rdev) <= S2MPA01_BUCK4) {
-		ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
-					 1 << enable_shift, 1 << enable_shift);
-		if (ret) {
-			dev_err(&rdev->dev, "failed to enable ramp rate\n");
-			return ret;
-		}
-	}
-
-	ramp_val = get_ramp_delay(ramp_delay);
-
-	return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
-				  ramp_val << ramp_shift);
-
-ramp_disable:
-	return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
-				  1 << enable_shift, 0);
-}
-
-static struct regulator_ops s2mpa01_ldo_ops = {
-	.list_voltage		= regulator_list_voltage_linear,
-	.map_voltage		= regulator_map_voltage_linear,
-	.is_enabled		= regulator_is_enabled_regmap,
-	.enable			= regulator_enable_regmap,
-	.disable		= regulator_disable_regmap,
-	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
-	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
-	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
-};
-
-static struct regulator_ops s2mpa01_buck_ops = {
-	.list_voltage		= regulator_list_voltage_linear,
-	.map_voltage		= regulator_map_voltage_linear,
-	.is_enabled		= regulator_is_enabled_regmap,
-	.enable			= regulator_enable_regmap,
-	.disable		= regulator_disable_regmap,
-	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
-	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
-	.set_voltage_time_sel	= s2mpa01_regulator_set_voltage_time_sel,
-	.set_ramp_delay		= s2mpa01_set_ramp_delay,
-};
-
-#define regulator_desc_ldo1(num)	{		\
-	.name		= "LDO"#num,			\
-	.id		= S2MPA01_LDO##num,		\
-	.ops		= &s2mpa01_ldo_ops,		\
-	.type		= REGULATOR_VOLTAGE,		\
-	.owner		= THIS_MODULE,			\
-	.min_uV		= S2MPA01_LDO_MIN,		\
-	.uV_step	= S2MPA01_LDO_STEP1,		\
-	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
-	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
-	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
-	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
-	.enable_mask	= S2MPA01_ENABLE_MASK		\
-}
-#define regulator_desc_ldo2(num)	{		\
-	.name		= "LDO"#num,			\
-	.id		= S2MPA01_LDO##num,		\
-	.ops		= &s2mpa01_ldo_ops,		\
-	.type		= REGULATOR_VOLTAGE,		\
-	.owner		= THIS_MODULE,			\
-	.min_uV		= S2MPA01_LDO_MIN,		\
-	.uV_step	= S2MPA01_LDO_STEP2,		\
-	.n_voltages	= S2MPA01_LDO_N_VOLTAGES,	\
-	.vsel_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
-	.vsel_mask	= S2MPA01_LDO_VSEL_MASK,	\
-	.enable_reg	= S2MPA01_REG_L1CTRL + num - 1,	\
-	.enable_mask	= S2MPA01_ENABLE_MASK		\
-}
-
-#define regulator_desc_buck1_4(num)	{			\
-	.name		= "BUCK"#num,				\
-	.id		= S2MPA01_BUCK##num,			\
-	.ops		= &s2mpa01_buck_ops,			\
-	.type		= REGULATOR_VOLTAGE,			\
-	.owner		= THIS_MODULE,				\
-	.min_uV		= S2MPA01_BUCK_MIN1,			\
-	.uV_step	= S2MPA01_BUCK_STEP1,			\
-	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
-	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
-	.vsel_reg	= S2MPA01_REG_B1CTRL2 + (num - 1) * 2,	\
-	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
-	.enable_reg	= S2MPA01_REG_B1CTRL1 + (num - 1) * 2,	\
-	.enable_mask	= S2MPA01_ENABLE_MASK			\
-}
-
-#define regulator_desc_buck5	{				\
-	.name		= "BUCK5",				\
-	.id		= S2MPA01_BUCK5,			\
-	.ops		= &s2mpa01_buck_ops,			\
-	.type		= REGULATOR_VOLTAGE,			\
-	.owner		= THIS_MODULE,				\
-	.min_uV		= S2MPA01_BUCK_MIN2,			\
-	.uV_step	= S2MPA01_BUCK_STEP1,			\
-	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
-	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
-	.vsel_reg	= S2MPA01_REG_B5CTRL2,			\
-	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
-	.enable_reg	= S2MPA01_REG_B5CTRL1,			\
-	.enable_mask	= S2MPA01_ENABLE_MASK			\
-}
-
-#define regulator_desc_buck6_7(num)	{			\
-	.name		= "BUCK"#num,				\
-	.id		= S2MPA01_BUCK##num,			\
-	.ops		= &s2mpa01_buck_ops,			\
-	.type		= REGULATOR_VOLTAGE,			\
-	.owner		= THIS_MODULE,				\
-	.min_uV		= S2MPA01_BUCK_MIN1,			\
-	.uV_step	= S2MPA01_BUCK_STEP1,			\
-	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
-	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
-	.vsel_reg	= S2MPA01_REG_B6CTRL2 + (num - 6) * 2,	\
-	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
-	.enable_reg	= S2MPA01_REG_B6CTRL1 + (num - 6) * 2,	\
-	.enable_mask	= S2MPA01_ENABLE_MASK			\
-}
-
-#define regulator_desc_buck8	{				\
-	.name		= "BUCK8",				\
-	.id		= S2MPA01_BUCK8,			\
-	.ops		= &s2mpa01_buck_ops,			\
-	.type		= REGULATOR_VOLTAGE,			\
-	.owner		= THIS_MODULE,				\
-	.min_uV		= S2MPA01_BUCK_MIN2,			\
-	.uV_step	= S2MPA01_BUCK_STEP2,			\
-	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
-	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
-	.vsel_reg	= S2MPA01_REG_B8CTRL2,			\
-	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
-	.enable_reg	= S2MPA01_REG_B8CTRL1,			\
-	.enable_mask	= S2MPA01_ENABLE_MASK			\
-}
-
-#define regulator_desc_buck9	{				\
-	.name		= "BUCK9",				\
-	.id		= S2MPA01_BUCK9,			\
-	.ops		= &s2mpa01_buck_ops,			\
-	.type		= REGULATOR_VOLTAGE,			\
-	.owner		= THIS_MODULE,				\
-	.min_uV		= S2MPA01_BUCK_MIN4,			\
-	.uV_step	= S2MPA01_BUCK_STEP2,			\
-	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
-	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
-	.vsel_reg	= S2MPA01_REG_B9CTRL2,			\
-	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
-	.enable_reg	= S2MPA01_REG_B9CTRL1,			\
-	.enable_mask	= S2MPA01_ENABLE_MASK			\
-}
-
-#define regulator_desc_buck10	{				\
-	.name		= "BUCK10",				\
-	.id		= S2MPA01_BUCK10,			\
-	.ops		= &s2mpa01_buck_ops,			\
-	.type		= REGULATOR_VOLTAGE,			\
-	.owner		= THIS_MODULE,				\
-	.min_uV		= S2MPA01_BUCK_MIN3,			\
-	.uV_step	= S2MPA01_BUCK_STEP2,			\
-	.n_voltages	= S2MPA01_BUCK_N_VOLTAGES,		\
-	.ramp_delay	= S2MPA01_RAMP_DELAY,			\
-	.vsel_reg	= S2MPA01_REG_B10CTRL2,			\
-	.vsel_mask	= S2MPA01_BUCK_VSEL_MASK,		\
-	.enable_reg	= S2MPA01_REG_B10CTRL1,			\
-	.enable_mask	= S2MPA01_ENABLE_MASK			\
-}
-
-static struct regulator_desc regulators[] = {
-	regulator_desc_ldo2(1),
-	regulator_desc_ldo1(2),
-	regulator_desc_ldo1(3),
-	regulator_desc_ldo1(4),
-	regulator_desc_ldo1(5),
-	regulator_desc_ldo2(6),
-	regulator_desc_ldo1(7),
-	regulator_desc_ldo1(8),
-	regulator_desc_ldo1(9),
-	regulator_desc_ldo1(10),
-	regulator_desc_ldo2(11),
-	regulator_desc_ldo1(12),
-	regulator_desc_ldo1(13),
-	regulator_desc_ldo1(14),
-	regulator_desc_ldo1(15),
-	regulator_desc_ldo1(16),
-	regulator_desc_ldo1(17),
-	regulator_desc_ldo1(18),
-	regulator_desc_ldo1(19),
-	regulator_desc_ldo1(20),
-	regulator_desc_ldo1(21),
-	regulator_desc_ldo2(22),
-	regulator_desc_ldo2(23),
-	regulator_desc_ldo1(24),
-	regulator_desc_ldo1(25),
-	regulator_desc_ldo1(26),
-	regulator_desc_buck1_4(1),
-	regulator_desc_buck1_4(2),
-	regulator_desc_buck1_4(3),
-	regulator_desc_buck1_4(4),
-	regulator_desc_buck5,
-	regulator_desc_buck6_7(6),
-	regulator_desc_buck6_7(7),
-	regulator_desc_buck8,
-	regulator_desc_buck9,
-	regulator_desc_buck10,
-};
-
-static int s2mpa01_pmic_probe(struct platform_device *pdev)
-{
-	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
-	struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
-	struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
-	struct device_node *reg_np = NULL;
-	struct regulator_config config = { };
-	struct s2mpa01_info *s2mpa01;
-	int i;
-
-	s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
-	if (!s2mpa01)
-		return -ENOMEM;
-
-	for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
-		rdata[i].name = regulators[i].name;
-
-	if (iodev->dev->of_node) {
-		reg_np = of_get_child_by_name(iodev->dev->of_node,
-							"regulators");
-			if (!reg_np) {
-				dev_err(&pdev->dev,
-					"could not find regulators sub-node\n");
-				return -EINVAL;
-			}
-
-		of_regulator_match(&pdev->dev, reg_np, rdata,
-						S2MPA01_REGULATOR_MAX);
-		of_node_put(reg_np);
-	}
-
-	platform_set_drvdata(pdev, s2mpa01);
-
-	config.dev = &pdev->dev;
-	config.regmap = iodev->regmap_pmic;
-	config.driver_data = s2mpa01;
-
-	for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
-		struct regulator_dev *rdev;
-		if (pdata)
-			config.init_data = pdata->regulators[i].initdata;
-		else
-			config.init_data = rdata[i].init_data;
-
-		if (reg_np)
-			config.of_node = rdata[i].of_node;
-
-		rdev = devm_regulator_register(&pdev->dev,
-						&regulators[i], &config);
-		if (IS_ERR(rdev)) {
-			dev_err(&pdev->dev, "regulator init failed for %d\n",
-				i);
-			return PTR_ERR(rdev);
-		}
-	}
-
-	return 0;
-}
-
-static const struct platform_device_id s2mpa01_pmic_id[] = {
-	{ "s2mpa01-pmic", 0},
-	{ },
-};
-MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);
-
-static struct platform_driver s2mpa01_pmic_driver = {
-	.driver = {
-		.name = "s2mpa01-pmic",
-		.owner = THIS_MODULE,
-	},
-	.probe = s2mpa01_pmic_probe,
-	.id_table = s2mpa01_pmic_id,
-};
-
-module_platform_driver(s2mpa01_pmic_driver);
-
-/* Module information */
-MODULE_AUTHOR("Sangbeom Kim <sbkim73-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>");
-MODULE_AUTHOR("Sachin Kamat <sachin.kamat-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>");
-MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
-MODULE_LICENSE("GPL");
-- 
1.9.1

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Re: [PATCH 1/3] regulator: s2mps11: Refactor setting ramp delay

[Yadwinder Singh Brar]

Hi Krzysztof,


On Mon, May 26, 2014 at 6:50 PM, Krzysztof Kozlowski
<k.kozlowski@samsung.com> wrote:
> Prepare for merging the s2mpa01 regulator driver into s2mps11 by:
> 1. Adding common id for buck regulators.
> 2. Splitting shared ramp delay settings to match S2MPA01.
> 3. Adding a configuration of registers for setting ramp delay for each
>    buck regulator.
>
> The functionality of the driver should not change as this patch only
> prepares for supporting S2MPA01 device.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> ---
>  drivers/regulator/s2mps11.c | 210 ++++++++++++++++++++++++++++++--------------
>  1 file changed, 144 insertions(+), 66 deletions(-)
>

[snip]

>
> -               if (ramp_delay > s2mps11->ramp_delay34)
> -                       s2mps11->ramp_delay34 = ramp_delay;
> +               if (ramp_delay > s2mps11->ramp_delay3)
> +                       s2mps11->ramp_delay3 = ramp_delay;
>                 else
> -                       ramp_delay = s2mps11->ramp_delay34;
> -
> -               ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
> -               ramp_reg = S2MPS11_REG_RAMP;
> +                       ramp_delay = s2mps11->ramp_delay3;
>                 break;
>         case S2MPS11_BUCK4:
> -               enable_shift = S2MPS11_BUCK4_RAMP_EN_SHIFT;
>                 if (!ramp_delay) {
>                         ramp_enable = 0;
>                         break;
>                 }
>
> -               if (ramp_delay > s2mps11->ramp_delay34)
> -                       s2mps11->ramp_delay34 = ramp_delay;
> +               if (ramp_delay > s2mps11->ramp_delay4)
> +                       s2mps11->ramp_delay4 = ramp_delay;
>                 else
> -                       ramp_delay = s2mps11->ramp_delay34;
> -
> -               ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
> -               ramp_reg = S2MPS11_REG_RAMP;
> +                       ramp_delay = s2mps11->ramp_delay4;

Main rationale behind shared value is completely omitted here, in
other cases also,
after just giving a NOTE in documentation asking user to make sure to
pass same value.
It doesn't seem safe, simply leaving a scope of stability issue (in
case ramp_delay3 > ramp_delay4).

Regards,
Yadwinder

Re: [PATCH 2/3] regulator: s2mps11: Merge S2MPA01 driver

[Yadwinder Singh Brar]

On Mon, May 26, 2014 at 6:50 PM, Krzysztof Kozlowski
<k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org> wrote:
> Add S2MPA01 support to the s2mps11 regulator driver. This obsoletes the
> s2mpa01 regulator driver.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

> @@ -216,30 +250,20 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
>                         ramp_delay = s2mps11->ramp_delay16;
>                 break;
>         case S2MPX_BUCK2:
> -               if (!ramp_delay) {
> -                       ramp_enable = 0;
> -                       break;
> -               }
> -

What if we want to disable ramp_delay from DT ?

> -               s2mps11->ramp_delay2 = ramp_delay;
> +               if (s2mps11->dev_type == S2MPS11X ||
> +                               ramp_delay > s2mps11->ramp_delay2)
> +                       s2mps11->ramp_delay2 = ramp_delay;
> +               else /* S2MPA01 && ramp_delay <= s2mpa01->ramp_delay24 */
> +                       ramp_delay = s2mps11->ramp_delay2;

Here ramp_delay = 0(ramp_disable case) is also getting over written,
if required to take care of it later.

>                 break;
>         case S2MPX_BUCK3:
> -               if (!ramp_delay) {
> -                       ramp_enable = 0;
> -                       break;
> -               }

[snip]

>
> -       if (!ramp_enable)
> -               goto ramp_disable;
> -
> -       /* Ramp delay can be enabled/disabled only for buck[2346] */
>         if (ramp_reg->enable_supported) {
> +               if (ramp_disable)

typo ?    if (!ramp_enable) / if (!ramp_delay) ?

> +                       goto ramp_disable;
> +


Also TBH, I can't get rationale behind this merge, As i can't see
considerable reduction in no of C code lines in comp of added
complexity.
 Is there considerable advantage in binary stats of single driver as
compare to independent drivers?


Regards,
Yadwinder
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Re: [PATCH 1/3] regulator: s2mps11: Refactor setting ramp delay

[Krzysztof Kozlowski]

On wto, 2014-05-27 at 11:56 +0530, Yadwinder Singh Brar wrote:
> Hi Krzysztof,
> 
> 
> On Mon, May 26, 2014 at 6:50 PM, Krzysztof Kozlowski
> <k.kozlowski@samsung.com> wrote:
> > Prepare for merging the s2mpa01 regulator driver into s2mps11 by:
> > 1. Adding common id for buck regulators.
> > 2. Splitting shared ramp delay settings to match S2MPA01.
> > 3. Adding a configuration of registers for setting ramp delay for each
> >    buck regulator.
> >
> > The functionality of the driver should not change as this patch only
> > prepares for supporting S2MPA01 device.
> >
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> > ---
> >  drivers/regulator/s2mps11.c | 210 ++++++++++++++++++++++++++++++--------------
> >  1 file changed, 144 insertions(+), 66 deletions(-)
> >
> 
> [snip]
> 
> >
> > -               if (ramp_delay > s2mps11->ramp_delay34)
> > -                       s2mps11->ramp_delay34 = ramp_delay;
> > +               if (ramp_delay > s2mps11->ramp_delay3)
> > +                       s2mps11->ramp_delay3 = ramp_delay;
> >                 else
> > -                       ramp_delay = s2mps11->ramp_delay34;
> > -
> > -               ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
> > -               ramp_reg = S2MPS11_REG_RAMP;
> > +                       ramp_delay = s2mps11->ramp_delay3;
> >                 break;
> >         case S2MPS11_BUCK4:
> > -               enable_shift = S2MPS11_BUCK4_RAMP_EN_SHIFT;
> >                 if (!ramp_delay) {
> >                         ramp_enable = 0;
> >                         break;
> >                 }
> >
> > -               if (ramp_delay > s2mps11->ramp_delay34)
> > -                       s2mps11->ramp_delay34 = ramp_delay;
> > +               if (ramp_delay > s2mps11->ramp_delay4)
> > +                       s2mps11->ramp_delay4 = ramp_delay;
> >                 else
> > -                       ramp_delay = s2mps11->ramp_delay34;
> > -
> > -               ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
> > -               ramp_reg = S2MPS11_REG_RAMP;
> > +                       ramp_delay = s2mps11->ramp_delay4;
> 
> Main rationale behind shared value is completely omitted here, in
> other cases also,
> after just giving a NOTE in documentation asking user to make sure to
> pass same value.
> It doesn't seem safe, simply leaving a scope of stability issue (in
> case ramp_delay3 > ramp_delay4).

The documentation already states that these bucks (e.g. 3 and 4) share
the ramp delay setting and 'regulator-ramp-delay' should be the same.
However you're right that patch is not safe against changing shared ramp
delays to different values. Previously the code was safe so this is not
entirely "non-functional" change. I'll fix it to retain the same
behavior.

Best regards,
Krzysztof

Re: [PATCH 2/3] regulator: s2mps11: Merge S2MPA01 driver

[Krzysztof Kozlowski]

On wto, 2014-05-27 at 12:00 +0530, Yadwinder Singh Brar wrote:
> On Mon, May 26, 2014 at 6:50 PM, Krzysztof Kozlowski
> <k.kozlowski@samsung.com> wrote:
> > Add S2MPA01 support to the s2mps11 regulator driver. This obsoletes the
> > s2mpa01 regulator driver.
> >
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> 
> > @@ -216,30 +250,20 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
> >                         ramp_delay = s2mps11->ramp_delay16;
> >                 break;
> >         case S2MPX_BUCK2:
> > -               if (!ramp_delay) {
> > -                       ramp_enable = 0;
> > -                       break;
> > -               }
> > -
> 
> What if we want to disable ramp_delay from DT ?

It will work OK because at the beginning of s2mps11_set_ramp_delay():
	unsigned int ramp_disable = !ramp_delay;
This 'ramp_disable' is later used if enable/disable is supported.
> 
> > -               s2mps11->ramp_delay2 = ramp_delay;
> > +               if (s2mps11->dev_type == S2MPS11X ||
> > +                               ramp_delay > s2mps11->ramp_delay2)
> > +                       s2mps11->ramp_delay2 = ramp_delay;
> > +               else /* S2MPA01 && ramp_delay <= s2mpa01->ramp_delay24 */
> > +                       ramp_delay = s2mps11->ramp_delay2;
> 
> Here ramp_delay = 0(ramp_disable case) is also getting over written,
> if required to take care of it later.

The same, it is already stored as 'ramp_disable' local variable.

> 
> >                 break;
> >         case S2MPX_BUCK3:
> > -               if (!ramp_delay) {
> > -                       ramp_enable = 0;
> > -                       break;
> > -               }
> 
> [snip]
> 
> >
> > -       if (!ramp_enable)
> > -               goto ramp_disable;
> > -
> > -       /* Ramp delay can be enabled/disabled only for buck[2346] */
> >         if (ramp_reg->enable_supported) {
> > +               if (ramp_disable)
> 
> typo ?    if (!ramp_enable) / if (!ramp_delay) ?

I think it is good. I changed the 'ramp_enable' into 'ramp_disable'.

Anyway while reviewing the code I found that I didn't updated the case
statements with new BUCKX enum values and the register for
enable/disable is hard-coded. I'll fix it.
> 
> > +                       goto ramp_disable;
> > +
> 
> 
> Also TBH, I can't get rationale behind this merge, As i can't see
> considerable reduction in no of C code lines in comp of added
> complexity.
>  Is there considerable advantage in binary stats of single driver as
> compare to independent drivers?

Overall more code is removed than added:
6 files changed, 454 insertions(+), 719 deletions(-)
but you are right that the code for ramp delay is now more complex. What
is worth noting now most of ramp delay settings are moved to an array:

static const struct s2mpx_ramp_reg s2mps11_ramp_regs[] = {
	[S2MPX_BUCK1]   = s2mps11_ramp_reg(BUCK16),
	[S2MPX_BUCK2]   = s2mps11_buck2346_ramp_reg(BUCK2, RAMP, BUCK2),
	[S2MPX_BUCK3]   = s2mps11_buck2346_ramp_reg(BUCK34, RAMP, BUCK3)

instead of being hard-coded into the big switch statement like it was
before.

Alternative solution to complex ramp delay setting is to just use
original functions: s2mps11_set_ramp_delay and s2mpa01_set_ramp_delay.

These chips are really similar so having two drivers seems like doubling
the effort for maintaining them.

Thanks for comments.

Best regards,
Krzysztof

Re: [PATCH 2/3] regulator: s2mps11: Merge S2MPA01 driver

[Yadwinder Singh Brar]

On Tue, May 27, 2014 at 1:26 PM, Krzysztof Kozlowski
<k.kozlowski@samsung.com> wrote:
> On wto, 2014-05-27 at 12:00 +0530, Yadwinder Singh Brar wrote:
>> On Mon, May 26, 2014 at 6:50 PM, Krzysztof Kozlowski
>> <k.kozlowski@samsung.com> wrote:
>> > Add S2MPA01 support to the s2mps11 regulator driver. This obsoletes the
>> > s2mpa01 regulator driver.
>> >
>> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
>>
>> > @@ -216,30 +250,20 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
>> >                         ramp_delay = s2mps11->ramp_delay16;
>> >                 break;
>> >         case S2MPX_BUCK2:
>> > -               if (!ramp_delay) {
>> > -                       ramp_enable = 0;
>> > -                       break;
>> > -               }
>> > -
>>
>> What if we want to disable ramp_delay from DT ?
>
> It will work OK because at the beginning of s2mps11_set_ramp_delay():
>         unsigned int ramp_disable = !ramp_delay;
> This 'ramp_disable' is later used if enable/disable is supported.
>>

Oh! I missed you defined a new variable "ramp_disable",
 since ramp_disable is already a label defined in same function.
It should be different, i think.

>> > -               s2mps11->ramp_delay2 = ramp_delay;
>> > +               if (s2mps11->dev_type == S2MPS11X ||
>> > +                               ramp_delay > s2mps11->ramp_delay2)
>> > +                       s2mps11->ramp_delay2 = ramp_delay;
>> > +               else /* S2MPA01 && ramp_delay <= s2mpa01->ramp_delay24 */
>> > +                       ramp_delay = s2mps11->ramp_delay2;
>>
>> Here ramp_delay = 0(ramp_disable case) is also getting over written,
>> if required to take care of it later.
>
> The same, it is already stored as 'ramp_disable' local variable.
>
>>
>> >                 break;
>> >         case S2MPX_BUCK3:
>> > -               if (!ramp_delay) {
>> > -                       ramp_enable = 0;
>> > -                       break;
>> > -               }
>>
>> [snip]
>>
>> >
>> > -       if (!ramp_enable)
>> > -               goto ramp_disable;
>> > -
>> > -       /* Ramp delay can be enabled/disabled only for buck[2346] */
>> >         if (ramp_reg->enable_supported) {
>> > +               if (ramp_disable)
>>
>> typo ?    if (!ramp_enable) / if (!ramp_delay) ?
>
> I think it is good. I changed the 'ramp_enable' into 'ramp_disable'.
>

ok, but very next statement is
             goto ramp_disable;

which seems odd and obfuscated me.

> Anyway while reviewing the code I found that I didn't updated the case
> statements with new BUCKX enum values and the register for
> enable/disable is hard-coded. I'll fix it.
>>
>> > +                       goto ramp_disable;
>> > +
>>
>>
>> Also TBH, I can't get rationale behind this merge, As i can't see
>> considerable reduction in no of C code lines in comp of added
>> complexity.
>>  Is there considerable advantage in binary stats of single driver as
>> compare to independent drivers?
>
> Overall more code is removed than added:
> 6 files changed, 454 insertions(+), 719 deletions(-)
> but you are right that the code for ramp delay is now more complex. What
> is worth noting now most of ramp delay settings are moved to an array:
>
> static const struct s2mpx_ramp_reg s2mps11_ramp_regs[] = {
>         [S2MPX_BUCK1]   = s2mps11_ramp_reg(BUCK16),
>         [S2MPX_BUCK2]   = s2mps11_buck2346_ramp_reg(BUCK2, RAMP, BUCK2),
>         [S2MPX_BUCK3]   = s2mps11_buck2346_ramp_reg(BUCK34, RAMP, BUCK3)
>
> instead of being hard-coded into the big switch statement like it was
> before.
>
> Alternative solution to complex ramp delay setting is to just use
> original functions: s2mps11_set_ramp_delay and s2mpa01_set_ramp_delay.
>
> These chips are really similar so having two drivers seems like doubling
> the effort for maintaining them.
>

I think maintaining a complex or a big file(in case we keep original
functions), itself will be an effort consuming thing and moreover
binary size of a single driver will also increase considerable as
compare to independent drivers (if its not case of multiplatform
kernel).

Anyways, i think its matter of preference of all, It will be OK, if
for others( especially maintainers, Mark ?), its OK.


Best Regards,
Yadwinder

> Thanks for comments.
>
> Best regards,
> Krzysztof
>