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Commit 075d1089 authored by Banajit Goswami's avatar Banajit Goswami Committed by Kukjin Kim
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ARM: SAMSUNG: Add PWM backlight support on Samsung S3C6410 



This patch adds support for LCD backlight using PWM timer for
Samsung SMDK6410 board.

Signed-off-by: default avatarBanajit Goswami <banajit.g@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 2ce30137

arch/arm/mach-s3c64xx/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -143,6 +143,7 @@ config MACH_SMDK6410 
	select S3C_DEV_USB_HSOTG

	select S3C_DEV_WDT

	select SAMSUNG_DEV_KEYPAD

	select SAMSUNG_DEV_PWM

	select HAVE_S3C2410_WATCHDOG if WATCHDOG

	select S3C64XX_SETUP_SDHCI

	select S3C64XX_SETUP_I2C1

arch/arm/mach-s3c64xx/mach-smdk6410.c

+43 −3
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/delay.h>

#include <linux/smsc911x.h>

#include <linux/regulator/fixed.h>

#include <linux/pwm_backlight.h>



#ifdef CONFIG_SMDK6410_WM1190_EV1

#include <linux/mfd/wm8350/core.h>
@@ -48,6 +49,7 @@ 
#include <mach/hardware.h>

#include <mach/regs-fb.h>

#include <mach/map.h>

#include <mach/gpio-bank-f.h>



#include <asm/irq.h>

#include <asm/mach-types.h>
@@ -118,7 +120,6 @@ static void smdk6410_lcd_power_set(struct plat_lcd_data *pd, 
{

	if (power) {

		gpio_direction_output(S3C64XX_GPF(13), 1);

		gpio_direction_output(S3C64XX_GPF(15), 1);



		/* fire nRESET on power up */

		gpio_direction_output(S3C64XX_GPN(5), 0);
@@ -126,7 +127,6 @@ static void smdk6410_lcd_power_set(struct plat_lcd_data *pd, 
		gpio_direction_output(S3C64XX_GPN(5), 1);

		msleep(1);

	} else {

		gpio_direction_output(S3C64XX_GPF(15), 0);

		gpio_direction_output(S3C64XX_GPF(13), 0);

	}

}
@@ -269,6 +269,45 @@ static struct samsung_keypad_platdata smdk6410_keypad_data __initdata = { 
	.cols		= 8,

};



static int smdk6410_backlight_init(struct device *dev)

{

	int ret;



	ret = gpio_request(S3C64XX_GPF(15), "Backlight");

	if (ret) {

		printk(KERN_ERR "failed to request GPF for PWM-OUT1\n");

		return ret;

	}



	/* Configure GPIO pin with S3C64XX_GPF15_PWM_TOUT1 */

	s3c_gpio_cfgpin(S3C64XX_GPF(15), S3C_GPIO_SFN(2));



	return 0;

}



static void smdk6410_backlight_exit(struct device *dev)

{

	s3c_gpio_cfgpin(S3C64XX_GPF(15), S3C_GPIO_OUTPUT);

	gpio_free(S3C64XX_GPF(15));

}



static struct platform_pwm_backlight_data smdk6410_backlight_data = {

	.pwm_id		= 1,

	.max_brightness	= 255,

	.dft_brightness	= 255,

	.pwm_period_ns	= 78770,

	.init		= smdk6410_backlight_init,

	.exit		= smdk6410_backlight_exit,

};



static struct platform_device smdk6410_backlight_device = {

	.name		= "pwm-backlight",

	.dev		= {

		.parent		= &s3c_device_timer[1].dev,

		.platform_data	= &smdk6410_backlight_data,

	},

};



static struct map_desc smdk6410_iodesc[] = {};



static struct platform_device *smdk6410_devices[] __initdata = {
@@ -298,6 +337,8 @@ static struct platform_device *smdk6410_devices[] __initdata = { 
	&s3c_device_rtc,

	&s3c_device_ts,

	&s3c_device_wdt,

	&s3c_device_timer[1],

	&smdk6410_backlight_device,

};



#ifdef CONFIG_REGULATOR
@@ -693,7 +734,6 @@ static void __init smdk6410_machine_init(void) 


	gpio_request(S3C64XX_GPN(5), "LCD power");

	gpio_request(S3C64XX_GPF(13), "LCD power");

	gpio_request(S3C64XX_GPF(15), "LCD power");



	i2c_register_board_info(0, i2c_devs0, ARRAY_SIZE(i2c_devs0));

	i2c_register_board_info(1, i2c_devs1, ARRAY_SIZE(i2c_devs1));