[PATCH v2 6/8] regulator: max77686: Add GPIO control
From: Krzysztof Kozlowski
Date: Wed Oct 29 2014 - 11:12:21 EST
Add enable control over GPIO for regulators supporting this: LDO20,
LDO21, LDO22, buck8 and buck9.
This is needed for proper (and full) configuration of the Maxim 77686
PMIC without creating redundant 'regulator-fixed' entries.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
---
drivers/regulator/Kconfig | 1 +
drivers/regulator/max77686.c | 97 ++++++++++++++++++++++++++++++++++++++++----
2 files changed, 90 insertions(+), 8 deletions(-)
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 55d7b7b0f2e0..156ab8032ea4 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -391,6 +391,7 @@ config REGULATOR_MAX8998
config REGULATOR_MAX77686
tristate "Maxim 77686 regulator"
depends on MFD_MAX77686
+ depends on GPIOLIB
help
This driver controls a Maxim 77686 regulator
via I2C bus. The provided regulator is suitable for
diff --git a/drivers/regulator/max77686.c b/drivers/regulator/max77686.c
index 5497e10b9659..9446509e7325 100644
--- a/drivers/regulator/max77686.c
+++ b/drivers/regulator/max77686.c
@@ -26,6 +26,7 @@
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
@@ -46,6 +47,11 @@
#define MAX77686_DVS_UVSTEP 12500
/*
+ * Value for configuring buck[89] and LDO{20,21,22} as GPIO control.
+ * It is the same as 'off' for other regulators.
+ */
+#define MAX77686_GPIO_CONTROL 0x0
+/*
* Values used for configuring LDOs and bucks.
* Forcing low power mode: LDO1, 3-5, 9, 13, 17-26
*/
@@ -82,6 +88,9 @@ enum max77686_ramp_rate {
};
struct max77686_data {
+ /* GPIO control over regulators */
+ int gpio[MAX77686_REGULATORS];
+
/* Array indexed by regulator id */
unsigned int opmode[MAX77686_REGULATORS];
};
@@ -100,6 +109,25 @@ static unsigned int max77686_get_opmode_shift(int id)
}
}
+/*
+ * When regulator is configured for GPIO control then it
+ * replaces "normal" mode. Any change from low power mode to normal
+ * should actually change to GPIO control.
+ * Map normal mode to proper value for such regulators.
+ */
+static int max77686_map_normal_mode(struct max77686_data *max77686, int id)
+{
+ switch (id) {
+ case MAX77686_BUCK8:
+ case MAX77686_BUCK9:
+ case MAX77686_LDO20 ... MAX77686_LDO22:
+ if (gpio_is_valid(max77686->gpio[id]))
+ return MAX77686_GPIO_CONTROL;
+ }
+
+ return MAX77686_NORMAL;
+}
+
/* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
static int max77686_set_suspend_disable(struct regulator_dev *rdev)
{
@@ -136,7 +164,7 @@ static int max77686_set_suspend_mode(struct regulator_dev *rdev,
val = MAX77686_LDO_LOWPOWER_PWRREQ;
break;
case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
- val = MAX77686_NORMAL;
+ val = max77686_map_normal_mode(max77686, id);
break;
default:
pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
@@ -160,7 +188,7 @@ static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
{
unsigned int val;
struct max77686_data *max77686 = rdev_get_drvdata(rdev);
- int ret;
+ int ret, id = rdev_get_id(rdev);
switch (mode) {
case REGULATOR_MODE_STANDBY: /* switch off */
@@ -170,7 +198,7 @@ static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
val = MAX77686_LDO_LOWPOWER_PWRREQ;
break;
case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
- val = MAX77686_NORMAL;
+ val = max77686_map_normal_mode(max77686, id);
break;
default:
pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
@@ -184,7 +212,7 @@ static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
if (ret)
return ret;
- max77686->opmode[rdev_get_id(rdev)] = val;
+ max77686->opmode[id] = val;
return 0;
}
@@ -197,7 +225,7 @@ static int max77686_enable(struct regulator_dev *rdev)
shift = max77686_get_opmode_shift(id);
if (max77686->opmode[id] == MAX77686_OFF_PWRREQ)
- max77686->opmode[id] = MAX77686_NORMAL;
+ max77686->opmode[id] = max77686_map_normal_mode(max77686, id);
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
@@ -428,8 +456,46 @@ static const struct regulator_desc regulators[] = {
regulator_desc_buck(9),
};
+static int max77686_enable_gpio_control(struct regulator_dev *rdev)
+{
+ return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+ rdev->desc->enable_mask,
+ MAX77686_GPIO_CONTROL);
+}
+
+static void max77686_pmic_dt_parse_gpio_control(struct platform_device *pdev,
+ struct max77686_data *max77686,
+ struct of_regulator_match *rdata)
+{
+ unsigned int i;
+ unsigned int valid_regulators[5] = { MAX77686_LDO20, MAX77686_LDO21,
+ MAX77686_LDO22, MAX77686_BUCK8, MAX77686_BUCK9 };
+
+ /*
+ * 0 is a valid GPIO so initialize all GPIOs to negative value
+ * to indicate that GPIO control won't be used for this regulator.
+ */
+ for (i = 0; i < MAX77686_REGULATORS; i++)
+ max77686->gpio[i] = -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(valid_regulators); i++) {
+ unsigned int id = valid_regulators[i];
+ int *gpio = &max77686->gpio[id];
+
+ /* Assuming that index of rdata matches 'id' */
+ if (!rdata[id].init_data || !rdata[id].of_node)
+ continue;
+
+ *gpio = of_get_named_gpio(rdata[id].of_node, "gpio", 0);
+ if (gpio_is_valid(*gpio))
+ dev_dbg(&pdev->dev, "Using GPIO %d for ext-control over %d/%s\n",
+ *gpio, id, rdata[id].of_node->name);
+ }
+}
+
static int max77686_pmic_dt_parse(struct platform_device *pdev,
- struct of_regulator_match *rdata)
+ struct max77686_data *max77686,
+ struct of_regulator_match *rdata)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct device_node *pmic_np, *regulators_np;
@@ -444,7 +510,6 @@ static int max77686_pmic_dt_parse(struct platform_device *pdev,
return -EINVAL;
}
-
ret = of_regulator_match(&pdev->dev, regulators_np, rdata,
MAX77686_REGULATORS);
if (ret < 0) {
@@ -454,6 +519,8 @@ static int max77686_pmic_dt_parse(struct platform_device *pdev,
}
/* else: don't care how many regulators were parsed from DTS. */
+ max77686_pmic_dt_parse_gpio_control(pdev, max77686, rdata);
+
of_node_put(regulators_np);
return 0;
@@ -477,6 +544,8 @@ static int max77686_pmic_probe(struct platform_device *pdev)
config.dev = &pdev->dev;
config.regmap = iodev->regmap;
config.driver_data = max77686;
+ config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
+ config.ena_gpio_initialized = true;
platform_set_drvdata(pdev, max77686);
rdata = kzalloc(sizeof(*rdata) * MAX77686_REGULATORS, GFP_KERNEL);
@@ -486,7 +555,7 @@ static int max77686_pmic_probe(struct platform_device *pdev)
for (i = 0; i < MAX77686_REGULATORS; i++)
rdata[i].name = regulators[i].name;
- ret = max77686_pmic_dt_parse(pdev, rdata);
+ ret = max77686_pmic_dt_parse(pdev, max77686, rdata);
if (ret)
goto out;
@@ -496,6 +565,7 @@ static int max77686_pmic_probe(struct platform_device *pdev)
config.init_data = rdata[i].init_data;
config.of_node = rdata[i].of_node;
+ config.ena_gpio = max77686->gpio[id];
max77686->opmode[id] = MAX77686_NORMAL;
@@ -507,6 +577,17 @@ static int max77686_pmic_probe(struct platform_device *pdev)
"regulator init failed for %d: %d\n", i, ret);
goto out;
}
+
+ if (gpio_is_valid(config.ena_gpio)) {
+ ret = max77686_enable_gpio_control(rdev);
+
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "regulator enable ext control failed for %d\n",
+ i);
+ goto out;
+ }
+ }
}
out:
--
1.9.1
--
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