diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2015-04-23 16:10:24 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-05-22 13:47:33 +0100 |
| commit | 69eb0980ab4ced06f7c2b4774575337ce32912fb (patch) | |
| tree | 3aeacd3144999f69e9bd679829f21a0f29abe301 /drivers/regulator/max8973-regulator.c | |
| parent | c2ffa9737878ad9843d1e0e904dc9a086438aff8 (diff) | |
| download | lwn-69eb0980ab4ced06f7c2b4774575337ce32912fb.tar.gz lwn-69eb0980ab4ced06f7c2b4774575337ce32912fb.zip | |
regulator: max8973: add mechanism to enable/disable through GPIO
MAX8973 supports the voltage output enable/disable through its EN
pin. This EN pin can be connected through GPIO from host processor.
Add support to provide GPIO number from platform/DT and if it is
valid GPIO then enable external control default.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/max8973-regulator.c')
| -rw-r--r-- | drivers/regulator/max8973-regulator.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c index 1442f920c80e..00cf91cc4c85 100644 --- a/drivers/regulator/max8973-regulator.c +++ b/drivers/regulator/max8973-regulator.c @@ -96,6 +96,7 @@ struct max8973_chip { struct regulator_desc desc; struct regmap *regmap; bool enable_external_control; + int enable_gpio; int dvs_gpio; int lru_index[MAX8973_MAX_VOUT_REG]; int curr_vout_val[MAX8973_MAX_VOUT_REG]; @@ -379,6 +380,7 @@ static struct max8973_regulator_platform_data *max8973_parse_dt( pdata->enable_ext_control = of_property_read_bool(np, "maxim,externally-enable"); + pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0); pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); @@ -409,6 +411,7 @@ static int max8973_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct max8973_regulator_platform_data *pdata; + struct regulator_init_data *ridata; struct regulator_config config = { }; struct regulator_dev *rdev; struct max8973_chip *max; @@ -427,7 +430,8 @@ static int max8973_probe(struct i2c_client *client, return -EIO; } - if (pdata->dvs_gpio == -EPROBE_DEFER) + if ((pdata->dvs_gpio == -EPROBE_DEFER) || + (pdata->enable_gpio == -EPROBE_DEFER)) return -EPROBE_DEFER; max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); @@ -453,6 +457,15 @@ static int max8973_probe(struct i2c_client *client, max->desc.uV_step = MAX8973_VOLATGE_STEP; max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; + max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; + max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL; + max->enable_external_control = pdata->enable_ext_control; + max->curr_gpio_val = pdata->dvs_def_state; + max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; + + if (gpio_is_valid(max->enable_gpio)) + max->enable_external_control = true; + if (!pdata->enable_ext_control) { max->desc.enable_reg = MAX8973_VOUT; max->desc.enable_mask = MAX8973_VOUT_ENABLE; @@ -461,11 +474,6 @@ static int max8973_probe(struct i2c_client *client, max->ops.is_enabled = regulator_is_enabled_regmap; } - max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; - max->enable_external_control = pdata->enable_ext_control; - max->curr_gpio_val = pdata->dvs_def_state; - max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; - max->lru_index[0] = max->curr_vout_reg; if (gpio_is_valid(max->dvs_gpio)) { @@ -509,6 +517,15 @@ static int max8973_probe(struct i2c_client *client, config.of_node = client->dev.of_node; config.regmap = max->regmap; + if (gpio_is_valid(max->enable_gpio)) { + ridata = pdata->reg_init_data; + config.ena_gpio_flags = GPIOF_OUT_INIT_LOW; + if (ridata && (ridata->constraints.always_on || + ridata->constraints.boot_on)) + config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH; + config.ena_gpio = max->enable_gpio; + } + /* Register the regulators */ rdev = devm_regulator_register(&client->dev, &max->desc, &config); if (IS_ERR(rdev)) { |