leds-lp55xx: add device reset function in lp5521/5523

 Use explicit each driver function rather than raw command.
 These function will be merged into the lp55xx common driver.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

drivers/leds/leds-lp5521.c

@@ -687,6 +687,13 @@ static void lp5521_unregister_sysfs(struct i2c_client *client)
 				&lp5521_led_attribute_group);
 }
 
+static void lp5521_reset_device(struct lp5521_chip *chip)
+{
+	struct i2c_client *client = chip->client;
+
+	lp5521_write(client, LP5521_REG_RESET, 0xff);
+}
+
 static int lp5521_init_device(struct lp5521_chip *chip)
 {
 	struct lp5521_platform_data *pdata = chip->pdata;
@@ -707,7 +714,8 @@ static int lp5521_init_device(struct lp5521_chip *chip)
 		usleep_range(1000, 2000); /* 500us abs min. */
 	}
 
-	lp5521_write(client, LP5521_REG_RESET, 0xff);
+	lp5521_reset_device(chip);
+
 	usleep_range(10000, 20000); /*
 				     * Exact value is not available. 10 - 20ms
 				     * appears to be enough for reset.

drivers/leds/leds-lp5523.c

@@ -946,6 +946,13 @@ static void lp5523_unregister_leds(struct lp5523_chip *chip)
 	}
 }
 
+static void lp5523_reset_device(struct lp5523_chip *chip)
+{
+	struct i2c_client *client = chip->client;
+
+	lp5523_write(client, LP5523_REG_RESET, 0xff);
+}
+
 static int lp5523_init_device(struct lp5523_chip *chip)
 {
 	struct lp5523_platform_data *pdata = chip->pdata;
@@ -965,7 +972,8 @@ static int lp5523_init_device(struct lp5523_chip *chip)
 		usleep_range(1000, 2000); /* 500us abs min. */
 	}
 
-	lp5523_write(client, LP5523_REG_RESET, 0xff);
+	lp5523_reset_device(chip);
+
 	usleep_range(10000, 20000); /*
 				     * Exact value is not available. 10 - 20ms
 				     * appears to be enough for reset.