backlight: lms283gf05: Convert to GPIO descriptors

This converts the lms283gf05 backlight driver to use GPIO
descriptors and switches the single PXA Palm Z2 device
over to defining these.

Since the platform data was only used to convey GPIO
information we can delete the platform data header.

Notice that we define the proper active low semantics in
the board file GPIO descriptor table (active low) and
assert the reset line by bringing it to "1" (asserted).

Cc: Marek Vasut <marex@denx.de>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Mack <daniel@zonque.org>
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 17 insertions, 26 deletions

diff --git a/drivers/video/backlight/lms283gf05.c b/drivers/video/backlight/lms283gf05.c
index 0e45685bcc1c..36856962ed83 100644
--- a/drivers/video/backlight/lms283gf05.c
+++ b/drivers/video/backlight/lms283gf05.c
@@ -9,16 +9,16 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/lcd.h>
 
 #include <linux/spi/spi.h>
-#include <linux/spi/lms283gf05.h>
 #include <linux/module.h>
 
 struct lms283gf05_state {
 	struct spi_device	*spi;
 	struct lcd_device	*ld;
+	struct gpio_desc	*reset;
 };
 
 struct lms283gf05_seq {
@@ -90,13 +90,13 @@ static const struct lms283gf05_seq disp_pdwnseq[] = {
 };
 
 
-static void lms283gf05_reset(unsigned long gpio, bool inverted)
+static void lms283gf05_reset(struct gpio_desc *gpiod)
 {
-	gpio_set_value(gpio, !inverted);
+	gpiod_set_value(gpiod, 0); /* De-asserted */
 	mdelay(100);
-	gpio_set_value(gpio, inverted);
+	gpiod_set_value(gpiod, 1); /* Asserted */
 	mdelay(20);
-	gpio_set_value(gpio, !inverted);
+	gpiod_set_value(gpiod, 0); /* De-asserted */
 	mdelay(20);
 }
 
@@ -125,18 +125,15 @@ static int lms283gf05_power_set(struct lcd_device *ld, int power)
 {
 	struct lms283gf05_state *st = lcd_get_data(ld);
 	struct spi_device *spi = st->spi;
-	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
 
 	if (power <= FB_BLANK_NORMAL) {
-		if (pdata)
-			lms283gf05_reset(pdata->reset_gpio,
-					pdata->reset_inverted);
+		if (st->reset)
+			lms283gf05_reset(st->reset);
 		lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 	} else {
 		lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
-		if (pdata)
-			gpio_set_value(pdata->reset_gpio,
-					pdata->reset_inverted);
+		if (st->reset)
+			gpiod_set_value(st->reset, 1); /* Asserted */
 	}
 
 	return 0;
@@ -150,24 +147,18 @@ static struct lcd_ops lms_ops = {
 static int lms283gf05_probe(struct spi_device *spi)
 {
 	struct lms283gf05_state *st;
-	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
 	struct lcd_device *ld;
-	int ret = 0;
-
-	if (pdata != NULL) {
-		ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
-				GPIOF_DIR_OUT | (!pdata->reset_inverted ?
-				GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
-				"LMS283GF05 RESET");
-		if (ret)
-			return ret;
-	}
 
 	st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
 				GFP_KERNEL);
 	if (st == NULL)
 		return -ENOMEM;
 
+	st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(st->reset))
+		return PTR_ERR(st->reset);
+	gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET");
+
 	ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,
 					&lms_ops);
 	if (IS_ERR(ld))
@@ -179,8 +170,8 @@ static int lms283gf05_probe(struct spi_device *spi)
 	spi_set_drvdata(spi, st);
 
 	/* kick in the LCD */
-	if (pdata)
-		lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
+	if (st->reset)
+		lms283gf05_reset(st->reset);
 	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
 
 	return 0;