regulator: max77686: Add GPIO control
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@samsung.com> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Krzysztof Kozlowski
Mark Brown
parent
bfa21a0dfe
commit
3307e9025d
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@ -26,6 +26,7 @@
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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@ -45,6 +46,11 @@
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#define MAX77686_DVS_MINUV 600000
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#define MAX77686_DVS_UVSTEP 12500
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/*
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* Value for configuring buck[89] and LDO{20,21,22} as GPIO control.
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* It is the same as 'off' for other regulators.
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*/
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#define MAX77686_GPIO_CONTROL 0x0
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/*
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* Values used for configuring LDOs and bucks.
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* Forcing low power mode: LDO1, 3-5, 9, 13, 17-26
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@ -82,6 +88,8 @@ enum max77686_ramp_rate {
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};
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struct max77686_data {
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u64 gpio_enabled:MAX77686_REGULATORS;
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/* Array indexed by regulator id */
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unsigned int opmode[MAX77686_REGULATORS];
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};
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@ -100,6 +108,26 @@ static unsigned int max77686_get_opmode_shift(int id)
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}
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}
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/*
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* When regulator is configured for GPIO control then it
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* replaces "normal" mode. Any change from low power mode to normal
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* should actually change to GPIO control.
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* Map normal mode to proper value for such regulators.
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*/
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static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
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int id)
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{
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switch (id) {
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case MAX77686_BUCK8:
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case MAX77686_BUCK9:
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case MAX77686_LDO20 ... MAX77686_LDO22:
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if (max77686->gpio_enabled & (1 << id))
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return MAX77686_GPIO_CONTROL;
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}
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return MAX77686_NORMAL;
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}
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/* Some BUCKs and LDOs supports Normal[ON/OFF] mode during suspend */
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static int max77686_set_suspend_disable(struct regulator_dev *rdev)
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{
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@ -136,7 +164,7 @@ static int max77686_set_suspend_mode(struct regulator_dev *rdev,
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val = MAX77686_LDO_LOWPOWER_PWRREQ;
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break;
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case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
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val = MAX77686_NORMAL;
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val = max77686_map_normal_mode(max77686, id);
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break;
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default:
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pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
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@ -160,7 +188,7 @@ static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
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{
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unsigned int val;
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struct max77686_data *max77686 = rdev_get_drvdata(rdev);
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int ret;
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int ret, id = rdev_get_id(rdev);
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switch (mode) {
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case REGULATOR_MODE_STANDBY: /* switch off */
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@ -170,7 +198,7 @@ static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
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val = MAX77686_LDO_LOWPOWER_PWRREQ;
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break;
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case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
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val = MAX77686_NORMAL;
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val = max77686_map_normal_mode(max77686, id);
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break;
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default:
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pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
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@ -184,7 +212,7 @@ static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
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if (ret)
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return ret;
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max77686->opmode[rdev_get_id(rdev)] = val;
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max77686->opmode[id] = val;
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return 0;
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}
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@ -197,7 +225,7 @@ static int max77686_enable(struct regulator_dev *rdev)
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shift = max77686_get_opmode_shift(id);
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if (max77686->opmode[id] == MAX77686_OFF_PWRREQ)
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max77686->opmode[id] = MAX77686_NORMAL;
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max77686->opmode[id] = max77686_map_normal_mode(max77686, id);
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return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
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rdev->desc->enable_mask,
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@ -229,6 +257,36 @@ static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
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MAX77686_RAMP_RATE_MASK, ramp_value << 6);
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}
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static int max77686_of_parse_cb(struct device_node *np,
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const struct regulator_desc *desc,
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struct regulator_config *config)
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{
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struct max77686_data *max77686 = config->driver_data;
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switch (desc->id) {
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case MAX77686_BUCK8:
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case MAX77686_BUCK9:
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case MAX77686_LDO20 ... MAX77686_LDO22:
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config->ena_gpio = of_get_named_gpio(np,
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"maxim,ena-gpios", 0);
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config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
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config->ena_gpio_initialized = true;
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break;
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default:
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return 0;
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}
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if (gpio_is_valid(config->ena_gpio)) {
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max77686->gpio_enabled |= (1 << desc->id);
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return regmap_update_bits(config->regmap, desc->enable_reg,
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desc->enable_mask,
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MAX77686_GPIO_CONTROL);
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}
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return 0;
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}
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static struct regulator_ops max77686_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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@ -283,6 +341,7 @@ static struct regulator_ops max77686_buck_dvs_ops = {
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.name = "LDO"#num, \
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.of_match = of_match_ptr("LDO"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.of_parse_cb = max77686_of_parse_cb, \
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.id = MAX77686_LDO##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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@ -355,6 +414,7 @@ static struct regulator_ops max77686_buck_dvs_ops = {
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.name = "BUCK"#num, \
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.of_match = of_match_ptr("BUCK"#num), \
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.regulators_node = of_match_ptr("voltage-regulators"), \
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.of_parse_cb = max77686_of_parse_cb, \
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.id = MAX77686_BUCK##num, \
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.ops = &max77686_ops, \
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.type = REGULATOR_VOLTAGE, \
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