diff options
Diffstat (limited to 'drivers/regulator/lp872x.c')
| -rw-r--r-- | drivers/regulator/lp872x.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/regulator/lp872x.c b/drivers/regulator/lp872x.c index 21c49d871aba..38992112fd6e 100644 --- a/drivers/regulator/lp872x.c +++ b/drivers/regulator/lp872x.c @@ -15,6 +15,7 @@ #include <linux/regmap.h> #include <linux/err.h> #include <linux/gpio.h> +#include <linux/delay.h> #include <linux/regulator/lp872x.h> #include <linux/regulator/driver.h> #include <linux/platform_device.h> @@ -757,6 +758,33 @@ set_default_dvs_mode: default_dvs_mode[lp->chipid]); } +static int lp872x_hw_enable(struct lp872x *lp) +{ + int ret, gpio; + + if (!lp->pdata) + return -EINVAL; + + gpio = lp->pdata->enable_gpio; + if (!gpio_is_valid(gpio)) + return 0; + + /* Always set enable GPIO high. */ + ret = devm_gpio_request_one(lp->dev, gpio, GPIOF_OUT_INIT_HIGH, "LP872X EN"); + if (ret) { + dev_err(lp->dev, "gpio request err: %d\n", ret); + return ret; + } + + /* Each chip has a different enable delay. */ + if (lp->chipid == LP8720) + usleep_range(LP8720_ENABLE_DELAY, 1.5 * LP8720_ENABLE_DELAY); + else + usleep_range(LP8725_ENABLE_DELAY, 1.5 * LP8725_ENABLE_DELAY); + + return 0; +} + static int lp872x_config(struct lp872x *lp) { struct lp872x_platform_data *pdata = lp->pdata; @@ -875,6 +903,8 @@ static struct lp872x_platform_data of_property_read_u8(np, "ti,dvs-state", &dvs_state); pdata->dvs->init_state = dvs_state ? DVS_HIGH : DVS_LOW; + pdata->enable_gpio = of_get_named_gpio(np, "enable-gpios", 0); + if (of_get_child_count(np) == 0) goto out; @@ -948,6 +978,10 @@ static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id) lp->chipid = id->driver_data; i2c_set_clientdata(cl, lp); + ret = lp872x_hw_enable(lp); + if (ret) + return ret; + ret = lp872x_config(lp); if (ret) return ret; |