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.kozlow...@samsung.com>
---
drivers/regulator/max77686.c | 83 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 78 insertions(+), 5 deletions(-)
diff --git a/drivers/regulator/max77686.c b/drivers/regulator/max77686.c
index 2c276d147c90..9108cde069fe 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];
bool missing_of_node;
@@ -101,6 +110,25 @@ 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)
{
@@ -137,7 +165,7 @@ 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",
@@ -161,7 +189,7 @@ 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 */
@@ -171,7 +199,7 @@ 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",
@@ -185,7 +213,7 @@ 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;
}
@@ -198,7 +226,7 @@ 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,
@@ -436,6 +464,33 @@ 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,
+ int *gpio)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int i;
+
+ /*
+ * 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++)
+ gpio[i] = -EINVAL;
+
+ gpio[MAX77686_LDO20] = of_get_named_gpio(np, "ldo20-gpio", 0);
+ gpio[MAX77686_LDO21] = of_get_named_gpio(np, "ldo21-gpio", 0);
+ gpio[MAX77686_LDO22] = of_get_named_gpio(np, "ldo22-gpio", 0);
+ gpio[MAX77686_BUCK8] = of_get_named_gpio(np, "buck8-gpio", 0);
+ gpio[MAX77686_BUCK9] = of_get_named_gpio(np, "buck9-gpio", 0);
+}
+
static int max77686_pmic_probe(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
@@ -467,12 +522,17 @@ 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);
+ max77686_pmic_dt_parse_gpio_control(pdev, max77686->gpio);
+
for (i = 0; i < MAX77686_REGULATORS; i++) {
struct regulator_dev *rdev;
int id = regulators[i].id;
+ config.ena_gpio = max77686->gpio[id];
max77686->opmode[id] = MAX77686_NORMAL;
rdev = devm_regulator_register(&pdev->dev,
@@ -485,6 +545,19 @@ static int max77686_pmic_probe(struct platform_device
*pdev)
of_node_put(pdev->dev.of_node);
return ret;
}
+
+ if (gpio_is_valid(config.ena_gpio)) {
+ int ret = max77686_enable_gpio_control(rdev);
+
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "regulator enable ext control failed
for %d\n",
+ i);
+ if (max77686->missing_of_node)
+ of_node_put(pdev->dev.of_node);
+ return ret;
+ }
+ }
}
return 0;
--
1.9.1
--
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