From fec8c900c8b2a08661f6ac3e1e71d6af6aaa67cd Mon Sep 17 00:00:00 2001 From: Konstantin Porotchkin Date: Mon, 29 May 2017 15:59:38 +0300 Subject: [PATCH] power: regulator: Add support for regulator-force-boot-off Add support for regulator-force-boot-off DT property. This property can be used by the board/device drivers for turning off regulators on early init stages as pre-requisite for the other components initialization. Signed-off-by: Konstantin Porotchkin Signed-off-by: Stefan Roese Cc: Jaehoon Chung Cc: Simon Glass Reviewed-by: Jaehoon Chung --- drivers/power/regulator/regulator-uclass.c | 38 ++++++++++++++++++++++ include/power/regulator.h | 23 +++++++++++++ 2 files changed, 61 insertions(+) diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c index 4d2e730271..fac9606823 100644 --- a/drivers/power/regulator/regulator-uclass.c +++ b/drivers/power/regulator/regulator-uclass.c @@ -311,6 +311,17 @@ int regulator_autoset(struct udevice *dev) return ret; } +int regulator_unset(struct udevice *dev) +{ + struct dm_regulator_uclass_plat *uc_pdata; + + uc_pdata = dev_get_uclass_plat(dev); + if (uc_pdata && uc_pdata->force_off) + return regulator_set_enable(dev, false); + + return -EMEDIUMTYPE; +} + static void regulator_show(struct udevice *dev, int ret) { struct dm_regulator_uclass_plat *uc_pdata; @@ -443,6 +454,7 @@ static int regulator_pre_probe(struct udevice *dev) uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on"); uc_pdata->ramp_delay = dev_read_u32_default(dev, "regulator-ramp-delay", 0); + uc_pdata->force_off = dev_read_bool(dev, "regulator-force-boot-off"); node = dev_read_subnode(dev, "regulator-state-mem"); if (ofnode_valid(node)) { @@ -495,6 +507,32 @@ int regulators_enable_boot_on(bool verbose) return ret; } +int regulators_enable_boot_off(bool verbose) +{ + struct udevice *dev; + struct uclass *uc; + int ret; + + ret = uclass_get(UCLASS_REGULATOR, &uc); + if (ret) + return ret; + for (uclass_first_device(UCLASS_REGULATOR, &dev); + dev; + uclass_next_device(&dev)) { + ret = regulator_unset(dev); + if (ret == -EMEDIUMTYPE) { + ret = 0; + continue; + } + if (verbose) + regulator_show(dev, ret); + if (ret == -ENOSYS) + ret = 0; + } + + return ret; +} + UCLASS_DRIVER(regulator) = { .id = UCLASS_REGULATOR, .name = "regulator", diff --git a/include/power/regulator.h b/include/power/regulator.h index da9a065bdd..fad87c99e5 100644 --- a/include/power/regulator.h +++ b/include/power/regulator.h @@ -151,6 +151,7 @@ enum regulator_flag { * @max_uA* - maximum amperage (micro Amps) * @always_on* - bool type, true or false * @boot_on* - bool type, true or false + * @force_off* - bool type, true or false * TODO(sjg@chromium.org): Consider putting the above two into @flags * @ramp_delay - Time to settle down after voltage change (unit: uV/us) * @flags: - flags value (see REGULATOR_FLAG_...) @@ -176,6 +177,7 @@ struct dm_regulator_uclass_plat { unsigned int ramp_delay; bool always_on; bool boot_on; + bool force_off; const char *name; int flags; u8 ctrl_reg; @@ -420,6 +422,15 @@ int regulator_set_mode(struct udevice *dev, int mode_id); */ int regulators_enable_boot_on(bool verbose); +/** + * regulators_enable_boot_off() - disable regulators needed for boot + * + * This disables all regulators which are marked to be off at boot time. + * + * This effectively calls regulator_unset() for every regulator. + */ +int regulators_enable_boot_off(bool verbose); + /** * regulator_autoset: setup the voltage/current on a regulator * @@ -439,6 +450,18 @@ int regulators_enable_boot_on(bool verbose); */ int regulator_autoset(struct udevice *dev); +/** + * regulator_unset: turn off a regulator + * + * The setup depends on constraints found in device's uclass's platform data + * (struct dm_regulator_uclass_platdata): + * + * - Disable - will set - if 'force_off' is set to true, + * + * The function returns on the first-encountered error. + */ +int regulator_unset(struct udevice *dev); + /** * regulator_autoset_by_name: setup the regulator given by its uclass's * platform data name field. The setup depends on constraints found in device's -- 2.39.5