Add an optional gpio regulator to support a power-supply control.
If a gpio power-supply regulator is supplied in the device tree, the
gpio is enabled during probe, and disabled on remove.
Signed-off-by: Eliav Farber <farbere@xxxxxxxxxx>
---
V1 -> V2:
Change pointed out by Rob Herring:
- Use a gpio regulator for power-supply control.
drivers/misc/eeprom/at24.c | 41 ++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index dc3537651b80..a5e3fe1403d9 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -25,6 +25,7 @@
#include <linux/platform_data/at24.h>
#include <linux/pm_runtime.h>
#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
/*
* I2C EEPROMs from most vendors are inexpensive and mostly interchangeable.
@@ -78,6 +79,8 @@ struct at24_data {
struct gpio_desc *wp_gpio;
+ struct regulator *supply;
+
/*
* Some chips tie up multiple I2C addresses; dummy devices reserve
* them for us, and we'll use them with SMBus calls.
@@ -615,6 +618,13 @@ static unsigned int at24_get_offset_adj(u8 flags, unsigned int byte_len)
}
}
+static void devm_at24_regulator_disable(void *data)
+{
+ struct at24_data *at24 = data;
+
+ regulator_disable(at24->supply);
+}
+
static int at24_probe(struct i2c_client *client)
{
struct regmap_config regmap_config = { };
@@ -674,6 +684,37 @@ static int at24_probe(struct i2c_client *client)
if (!at24)
return -ENOMEM;
+ at24->supply = devm_regulator_get_optional(dev, "power");
+ if (IS_ERR(at24->supply)) {
+ err = PTR_ERR(at24->supply);
+ if (err == -ENODEV)
+ at24->supply = NULL;
+ else
+ return dev_err_probe(dev, err,
+ "failed to get power-supply regulator\n");
+ }
+
+ if (at24->supply) {
+ err = regulator_enable(at24->supply);
+ if (err < 0) {
+ dev_err(dev,
+ "failed to enable power-supply regulator: %d\n",
+ err);
+ return err;
+ }
+
+ err = devm_add_action_or_reset(dev, devm_at24_regulator_disable,
+ at24);
+ if (err < 0) {
+ dev_err(dev,
+ "failed to adction to disable power-supply regulator: %d\n",
+ err);
+ return err;
+ }
+
+ usleep_range(2000, 3000);
+ }
+
mutex_init(&at24->lock);
at24->byte_len = pdata.byte_len;
at24->page_size = pdata.page_size;
--
2.37.1
