linux-kernel - [PATCH 4/4] s3c2440: mini2440: Enable the backlight LED earlier at boot time.

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Message-Id: <1301380363-3282-5-git-send-email-marek.belisko@open-nandra.com>
Date:	Tue, 29 Mar 2011 08:32:43 +0200
From:	Marek Belisko <marek.belisko@...n-nandra.com>
To:	ben-linux@...ff.org
Cc:	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, rpurdie@...ys.net,
	esta1ien@...il.com, buserror@...il.com,
	Marek Belisko <marek.belisko@...n-nandra.com>
Subject: [PATCH 4/4] s3c2440: mini2440: Enable the backlight LED earlier at boot time.

Code overtaken from:
http://repo.or.cz/w/linux-2.6/mini2440.git

Use flag that allows s3c24xx LED to start in the "on" state.
This is necesary to enable LCD backlight during early boot stage.

Signed-off-by: Marek Belisko <marek.belisko@...n-nandra.com>
Signed-off-by: Michel Pollet <buserror@...il.com>
---
 arch/arm/mach-s3c2410/include/mach/leds-gpio.h |    1 +
 arch/arm/mach-s3c2440/mach-mini2440.c          |    1 +
 drivers/leds/leds-s3c24xx.c                    |    6 +++++-
 3 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-s3c2410/include/mach/leds-gpio.h b/arch/arm/mach-s3c2410/include/mach/leds-gpio.h
index d8a7672..c3ae81f 100644
--- a/arch/arm/mach-s3c2410/include/mach/leds-gpio.h
+++ b/arch/arm/mach-s3c2410/include/mach/leds-gpio.h
@@ -16,6 +16,7 @@
 
 #define S3C24XX_LEDF_ACTLOW	(1<<0)		/* LED is on when GPIO low */
 #define S3C24XX_LEDF_TRISTATE	(1<<1)		/* tristate to turn off */
+#define S3C24XX_LEDF_STARTON    (1<<2)          /* Initialise 'on' */
 
 struct s3c24xx_led_platdata {
 	unsigned int		 gpio;
diff --git a/arch/arm/mach-s3c2440/mach-mini2440.c b/arch/arm/mach-s3c2440/mach-mini2440.c
index 163d318..46f2034 100644
--- a/arch/arm/mach-s3c2440/mach-mini2440.c
+++ b/arch/arm/mach-s3c2440/mach-mini2440.c
@@ -451,6 +451,7 @@ static struct s3c24xx_led_platdata mini2440_led4_pdata = {
 static struct s3c24xx_led_platdata mini2440_led_backlight_pdata = {
 	.name		= "backlight",
 	.gpio		= S3C2410_GPG(4),
+	.flags		= S3C24XX_LEDF_STARTON,
 	.def_trigger	= "backlight",
 };
 
diff --git a/drivers/leds/leds-s3c24xx.c b/drivers/leds/leds-s3c24xx.c
index a77771d..42d0a08 100644
--- a/drivers/leds/leds-s3c24xx.c
+++ b/drivers/leds/leds-s3c24xx.c
@@ -95,7 +95,11 @@ static int s3c24xx_led_probe(struct platform_device *dev)
 		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
 	} else {
 		s3c2410_gpio_pullup(pdata->gpio, 0);
-		s3c2410_gpio_setpin(pdata->gpio, 0);
+
+		if (pdata->flags & S3C24XX_LEDF_STARTON)
+			s3c2410_gpio_setpin(pdata->gpio, 1);
+		else
+			s3c2410_gpio_setpin(pdata->gpio, 0);
 		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
 	}
 
-- 
1.7.1

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