leds: lp55xx: Convert to use GPIO descriptors

The LP55xx driver is already using the of_gpio() functions to
pick a global GPIO number for "enable" from the device tree and
request the line. Simplify it by just using a GPIO descriptor.

Make sure to keep the enable GPIO line optional, change the
naming from "lp5523_enable" to "LP55xx enable" to reflect that
this is used on all LP55xx LED drivers.

Cc: Milo Kim <milo.kim@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

drivers/leds/leds-lp55xx-common.c

@@ -17,8 +17,7 @@
 #include <linux/module.h>
 #include <linux/platform_data/leds-lp55xx.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 
 #include "leds-lp55xx-common.h"
 
@@ -395,18 +394,11 @@ int lp55xx_init_device(struct lp55xx_chip *chip)
 	if (!pdata || !cfg)
 		return -EINVAL;
 
-	if (gpio_is_valid(pdata->enable_gpio)) {
-		ret = devm_gpio_request_one(dev, pdata->enable_gpio,
-					    GPIOF_DIR_OUT, "lp5523_enable");
-		if (ret < 0) {
-			dev_err(dev, "could not acquire enable gpio (err=%d)\n",
-				ret);
-			goto err;
-		}
-
-		gpio_set_value(pdata->enable_gpio, 0);
+	if (pdata->enable_gpiod) {
+		gpiod_set_consumer_name(pdata->enable_gpiod, "LP55xx enable");
+		gpiod_set_value(pdata->enable_gpiod, 0);
 		usleep_range(1000, 2000); /* Keep enable down at least 1ms */
-		gpio_set_value(pdata->enable_gpio, 1);
+		gpiod_set_value(pdata->enable_gpiod, 1);
 		usleep_range(1000, 2000); /* 500us abs min. */
 	}
 
@@ -447,8 +439,8 @@ void lp55xx_deinit_device(struct lp55xx_chip *chip)
 	if (chip->clk)
 		clk_disable_unprepare(chip->clk);
 
-	if (gpio_is_valid(pdata->enable_gpio))
-		gpio_set_value(pdata->enable_gpio, 0);
+	if (pdata->enable_gpiod)
+		gpiod_set_value(pdata->enable_gpiod, 0);
 }
 EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
 
@@ -579,7 +571,10 @@ struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
 	of_property_read_string(np, "label", &pdata->label);
 	of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
 
-	pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
+	pdata->enable_gpiod = devm_gpiod_get_optional(dev, "enable",
+						      GPIOD_ASIS);
+	if (IS_ERR(pdata->enable_gpiod))
+		return ERR_CAST(pdata->enable_gpiod);
 
 	/* LP8501 specific */
 	of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);

include/linux/platform_data/leds-lp55xx.h

@@ -12,6 +12,8 @@
 #ifndef _LEDS_LP55XX_H
 #define _LEDS_LP55XX_H
 
+#include <linux/gpio/consumer.h>
+
 /* Clock configuration */
 #define LP55XX_CLOCK_AUTO	0
 #define LP55XX_CLOCK_INT	1
@@ -49,7 +51,7 @@ enum lp8501_pwr_sel {
  * @clock_mode        : Input clock mode. LP55XX_CLOCK_AUTO or _INT or _EXT
  * @setup_resources   : Platform specific function before enabling the chip
  * @release_resources : Platform specific function after  disabling the chip
- * @enable            : EN pin control by platform side
+ * @enable_gpiod      : enable GPIO descriptor
  * @patterns          : Predefined pattern data for RGB channels
  * @num_patterns      : Number of patterns
  * @update_config     : Value of CONFIG register
@@ -65,7 +67,7 @@ struct lp55xx_platform_data {
 	u8 clock_mode;
 
 	/* optional enable GPIO */
-	int enable_gpio;
+	struct gpio_desc *enable_gpiod;
 
 	/* Predefined pattern data */
 	struct lp55xx_predef_pattern *patterns;