linux-kernel - [PATCH] video: backlight: Replace old GPIO APIs with GPIO Consumer APIs for sky81542-backlight driver

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Message-ID: <20190612043229.GA18179@t-1000>
Date:   Tue, 11 Jun 2019 21:32:32 -0700
From:   Shobhit Kukreti <shobhitkukreti@...il.com>
To:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     shobhitkukreti@...il.com
Subject: [PATCH] video: backlight: Replace old GPIO APIs with GPIO Consumer
 APIs for sky81542-backlight driver

Port the sky81452-backlight driver to adhere to new gpio descriptor based
APIs. Modified the file sky81452-backlight.c and sky81452-backlight.h.
The gpio descriptor property in device tree should be "sky81452-en-gpios"

Removed unnecessary header files "linux/gpio.h" and "linux/of_gpio.h".

Signed-off-by: Shobhit Kukreti <shobhitkukreti@...il.com>
---
 drivers/video/backlight/sky81452-backlight.c     | 24 ++++++++++++------------
 include/linux/platform_data/sky81452-backlight.h |  4 +++-
 2 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/video/backlight/sky81452-backlight.c b/drivers/video/backlight/sky81452-backlight.c
index d414c7a..12ef628 100644
--- a/drivers/video/backlight/sky81452-backlight.c
+++ b/drivers/video/backlight/sky81452-backlight.c
@@ -19,12 +19,10 @@
 
 #include <linux/backlight.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/platform_data/sky81452-backlight.h>
@@ -193,7 +191,6 @@ static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
 	pdata->ignore_pwm = of_property_read_bool(np, "skyworks,ignore-pwm");
 	pdata->dpwm_mode = of_property_read_bool(np, "skyworks,dpwm-mode");
 	pdata->phase_shift = of_property_read_bool(np, "skyworks,phase-shift");
-	pdata->gpio_enable = of_get_gpio(np, 0);
 
 	ret = of_property_count_u32_elems(np, "led-sources");
 	if (ret < 0) {
@@ -274,13 +271,17 @@ static int sky81452_bl_probe(struct platform_device *pdev)
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	}
-
-	if (gpio_is_valid(pdata->gpio_enable)) {
-		ret = devm_gpio_request_one(dev, pdata->gpio_enable,
-					GPIOF_OUT_INIT_HIGH, "sky81452-en");
-		if (ret < 0) {
-			dev_err(dev, "failed to request GPIO. err=%d\n", ret);
-			return ret;
+	pdata->gpiod_enable = devm_gpiod_get(dev, "sk81452-en", GPIOD_OUT_HIGH);
+	if (IS_ERR(pdata->gpiod_enable)) {
+		long ret = PTR_ERR(pdata->gpiod_enable);
+
+		/**
+		 * gpiod_enable is optional in device tree.
+		 * Return error only if gpio was assigned in device tree
+		 */
+		if (ret != -ENOENT) {
+			dev_err(dev, "failed to request GPIO. err=%ld\n", ret);
+			return PTR_ERR(pdata->gpiod_enable);
 		}
 	}
 
@@ -323,8 +324,7 @@ static int sky81452_bl_remove(struct platform_device *pdev)
 	bd->props.brightness = 0;
 	backlight_update_status(bd);
 
-	if (gpio_is_valid(pdata->gpio_enable))
-		gpio_set_value_cansleep(pdata->gpio_enable, 0);
+	gpiod_set_value_cansleep(pdata->gpiod_enable, 0);
 
 	return 0;
 }
diff --git a/include/linux/platform_data/sky81452-backlight.h b/include/linux/platform_data/sky81452-backlight.h
index 1231e9b..dc4cb85 100644
--- a/include/linux/platform_data/sky81452-backlight.h
+++ b/include/linux/platform_data/sky81452-backlight.h
@@ -20,6 +20,8 @@
 #ifndef _SKY81452_BACKLIGHT_H
 #define _SKY81452_BACKLIGHT_H
 
+#include <linux/gpio/consumer.h>
+
 /**
  * struct sky81452_platform_data
  * @name:	backlight driver name.
@@ -34,7 +36,7 @@
  */
 struct sky81452_bl_platform_data {
 	const char *name;
-	int gpio_enable;
+	struct gpio_desc *gpiod_enable;
 	unsigned int enable;
 	bool ignore_pwm;
 	bool dpwm_mode;
-- 
2.7.4