[PATCH 2/6] hwmon: (pmbus/max20830): add support for enable GPIO

[Alexis Czezar Torreno <alexisczezar.torreno@analog.com>]

Add support for the GPIO controlled EN pin. The EN pin is asserted high
for device to operate.

Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
---
 drivers/hwmon/pmbus/max20830.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hwmon/pmbus/max20830.c b/drivers/hwmon/pmbus/max20830.c
index cb2c23672166d641852199ca07eb716924f4f286..cb3a39d747edee3aefb0fb4051ef957436b3c15b 100644
--- a/drivers/hwmon/pmbus/max20830.c
+++ b/drivers/hwmon/pmbus/max20830.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/errno.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
@@ -29,8 +30,14 @@ static struct pmbus_driver_info max20830_info = {
 static int max20830_probe(struct i2c_client *client)
 {
 	u8 buf[I2C_SMBUS_BLOCK_MAX + 1] = {};
+	struct gpio_desc *enable_gpio;
 	int ret;
 
+	enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH);
+	if (IS_ERR(enable_gpio))
+		return dev_err_probe(&client->dev, PTR_ERR(enable_gpio),
+				     "Failed to get enable GPIO\n");
+
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BLOCK_DATA) &&
 	    !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK))
 		return -ENODEV;

-- 
2.34.1