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authorPaul Kocialkowski <contact@paulk.fr>2016-02-05 18:42:19 (GMT)
committerMark Brown <broonie@kernel.org>2016-02-05 18:57:09 (GMT)
commit7e6213f4345c3798b7fb7af41d221e2fd77ec6a6 (patch)
treedb5025cf16488f9b37c8b67785c991ce64185302 /drivers/regulator
parent690f44badf2f44b8ec09098118b74f789f95e2c8 (diff)
downloadlinux-7e6213f4345c3798b7fb7af41d221e2fd77ec6a6.tar.xz
regulator: lp872x: Add enable GPIO pin support
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>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/lp872x.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/regulator/lp872x.c b/drivers/regulator/lp872x.c
index 21c49d8..3899211 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;