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regulator: lp872x: Add enable GPIO pin support

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LP872x regulators are made active via the EN pin, which might be hooked to a
GPIO. This adds support for driving the GPIO high when the driver is in use.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Paul Kocialkowski
2016-02-05 19:42:19 +01:00
committed by Mark Brown
parent 690f44badf
commit 7e6213f434
3 changed files with 40 additions and 0 deletions
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34
drivers/regulator/lp872x.c
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@@ -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;