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Commit 5cd435b4 authored by Banajit Goswami's avatar Banajit Goswami Committed by Kukjin Kim
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ARM: SAMSUNG: Add PWM backlight support on Samsung S5PV210 



This patch adds support for LCD backlight control using PWM timer
for Samsung's SMDKV210 board.

Signed-off-by: default avatarBanajit Goswami <banajit.g@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent baa0c060

arch/arm/mach-s5pv210/Kconfig

+1 −0
Original line number Original line Diff line number Diff line
@@ -130,6 +130,7 @@ config MACH_SMDKV210 
	select SAMSUNG_DEV_ADC

	select SAMSUNG_DEV_ADC

	select SAMSUNG_DEV_IDE

	select SAMSUNG_DEV_IDE

	select SAMSUNG_DEV_KEYPAD

	select SAMSUNG_DEV_KEYPAD

	select SAMSUNG_DEV_PWM

	select SAMSUNG_DEV_TS

	select SAMSUNG_DEV_TS

	select S5PV210_SETUP_FB_24BPP

	select S5PV210_SETUP_FB_24BPP

	select S5PV210_SETUP_I2C1

	select S5PV210_SETUP_I2C1

arch/arm/mach-s5pv210/mach-smdkv210.c

+43 −0
Original line number Original line Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/fb.h>

#include <linux/fb.h>

#include <linux/gpio.h>

#include <linux/gpio.h>

#include <linux/delay.h>

#include <linux/delay.h>

#include <linux/pwm_backlight.h>





#include <asm/mach/arch.h>

#include <asm/mach/arch.h>

#include <asm/mach/map.h>

#include <asm/mach/map.h>
@@ -43,6 +44,7 @@ 
#include <plat/keypad.h>

#include <plat/keypad.h>

#include <plat/pm.h>

#include <plat/pm.h>

#include <plat/fb.h>

#include <plat/fb.h>

#include <plat/gpio-cfg.h>





/* Following are default values for UCON, ULCON and UFCON UART registers */

/* Following are default values for UCON, ULCON and UFCON UART registers */

#define SMDKV210_UCON_DEFAULT	(S3C2410_UCON_TXILEVEL |	\

#define SMDKV210_UCON_DEFAULT	(S3C2410_UCON_TXILEVEL |	\
@@ -208,6 +210,45 @@ static struct s3c_fb_platdata smdkv210_lcd0_pdata __initdata = { 
	.setup_gpio	= s5pv210_fb_gpio_setup_24bpp,

	.setup_gpio	= s5pv210_fb_gpio_setup_24bpp,

};

};





static int smdkv210_backlight_init(struct device *dev)

{

	int ret;



	ret = gpio_request(S5PV210_GPD0(3), "Backlight");

	if (ret) {

		printk(KERN_ERR "failed to request GPD for PWM-OUT 3\n");

		return ret;

	}



	/* Configure GPIO pin with S5PV210_GPD_0_3_TOUT_3 */

	s3c_gpio_cfgpin(S5PV210_GPD0(3), S3C_GPIO_SFN(2));



	return 0;

}



static void smdkv210_backlight_exit(struct device *dev)

{

	s3c_gpio_cfgpin(S5PV210_GPD0(3), S3C_GPIO_OUTPUT);

	gpio_free(S5PV210_GPD0(3));

}



static struct platform_pwm_backlight_data smdkv210_backlight_data = {

	.pwm_id		= 3,

	.max_brightness	= 255,

	.dft_brightness	= 255,

	.pwm_period_ns	= 78770,

	.init		= smdkv210_backlight_init,

	.exit		= smdkv210_backlight_exit,

};



static struct platform_device smdkv210_backlight_device = {

	.name		= "pwm-backlight",

	.dev		= {

		.parent		= &s3c_device_timer[3].dev,

		.platform_data	= &smdkv210_backlight_data,

	},

};



static struct platform_device *smdkv210_devices[] __initdata = {

static struct platform_device *smdkv210_devices[] __initdata = {

	&s3c_device_adc,

	&s3c_device_adc,

	&s3c_device_cfcon,

	&s3c_device_cfcon,
@@ -229,6 +270,8 @@ static struct platform_device *smdkv210_devices[] __initdata = { 
	&samsung_device_keypad,

	&samsung_device_keypad,

	&smdkv210_dm9000,

	&smdkv210_dm9000,

	&smdkv210_lcd_lte480wv,

	&smdkv210_lcd_lte480wv,

	&s3c_device_timer[3],

	&smdkv210_backlight_device,

};

};





static void __init smdkv210_dm9000_init(void)

static void __init smdkv210_dm9000_init(void)