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 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html