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/max77686.c | 58 ++++++++++++++++++++++++++++++++++++++++----
1 file changed, 53 insertions(+), 5 deletions(-)
diff --git a/drivers/regulator/max77686.c b/drivers/regulator/max77686.c
index 10d206266ac2..0d6bddad0ef4 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 +88,8 @@ enum max77686_ramp_rate {
};
struct max77686_data {
+ unsigned long long gpio_enabled:MAX77686_REGULATORS;
+
/* Array indexed by regulator id */
unsigned int opmode[MAX77686_REGULATORS];
};
@@ -100,6 +108,26 @@ 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 unsigned 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 (max77686->gpio_enabled & (1 << 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,
@@ -229,6 +257,25 @@ static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
MAX77686_RAMP_RATE_MASK, ramp_value << 6);
}
+static int max77686_enable_gpio_control(struct regulator_dev *rdev)
+{
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ int id = rdev_get_id(rdev);
+
+ switch (id) {
+ case MAX77686_BUCK8:
+ case MAX77686_BUCK9:
+ case MAX77686_LDO20 ... MAX77686_LDO22:
+ max77686->gpio_enabled |= (1 << id);
+
+ return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+ rdev->desc->enable_mask,
+ MAX77686_GPIO_CONTROL);
+ }
+
+ return -EINVAL;
+}
+
static struct regulator_ops max77686_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
@@ -239,6 +286,7 @@ static struct regulator_ops max77686_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_mode = max77686_set_suspend_mode,
+ .set_ena_gpio = max77686_enable_gpio_control,
};
static struct regulator_ops max77686_ldo_ops = {
--
1.9.1
--
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