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Commit fec524aa authored by Banajit Goswami's avatar Banajit Goswami Committed by Kukjin Kim
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ARM: SAMSUNG: Add PWM backlight support on Samsung S5P6440 



This patch adds support for LCD backlight control using PWM timer
for Samsung SMDK6440 board.

Signed-off-by: default avatarBanajit Goswami <banajit.g@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 075d1089

arch/arm/mach-s5p64x0/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ config MACH_SMDK6440 
	select S3C_DEV_WDT

	select S3C64XX_DEV_SPI

	select SAMSUNG_DEV_ADC

	select SAMSUNG_DEV_PWM

	select SAMSUNG_DEV_TS

	select S5P64X0_SETUP_I2C1

	help

arch/arm/mach-s5p64x0/mach-smdk6440.c

+43 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/module.h>

#include <linux/clk.h>

#include <linux/gpio.h>

#include <linux/pwm_backlight.h>



#include <asm/mach/arch.h>

#include <asm/mach/map.h>
@@ -32,6 +33,7 @@ 
#include <mach/map.h>

#include <mach/regs-clock.h>

#include <mach/i2c.h>

#include <mach/regs-gpio.h>



#include <plat/regs-serial.h>

#include <plat/gpio-cfg.h>
@@ -88,6 +90,45 @@ static struct s3c2410_uartcfg smdk6440_uartcfgs[] __initdata = { 
	},

};



static int smdk6440_backlight_init(struct device *dev)

{

	int ret;



	ret = gpio_request(S5P6440_GPF(15), "Backlight");

	if (ret) {

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

		return ret;

	}



	/* Configure GPIO pin with S5P6440_GPF15_PWM_TOUT1 */

	s3c_gpio_cfgpin(S5P6440_GPF(15), S3C_GPIO_SFN(2));



	return 0;

}



static void smdk6440_backlight_exit(struct device *dev)

{

	s3c_gpio_cfgpin(S5P6440_GPF(15), S3C_GPIO_OUTPUT);

	gpio_free(S5P6440_GPF(15));

}



static struct platform_pwm_backlight_data smdk6440_backlight_data = {

	.pwm_id		= 1,

	.max_brightness	= 255,

	.dft_brightness	= 255,

	.pwm_period_ns	= 78770,

	.init		= smdk6440_backlight_init,

	.exit		= smdk6440_backlight_exit,

};



static struct platform_device smdk6440_backlight_device = {

	.name		= "pwm-backlight",

	.dev		= {

		.parent		= &s3c_device_timer[1].dev,

		.platform_data	= &smdk6440_backlight_data,

	},

};



static struct platform_device *smdk6440_devices[] __initdata = {

	&s3c_device_adc,

	&s3c_device_rtc,
@@ -97,6 +138,8 @@ static struct platform_device *smdk6440_devices[] __initdata = { 
	&s3c_device_wdt,

	&samsung_asoc_dma,

	&s5p6440_device_iis,

	&s3c_device_timer[1],

	&smdk6440_backlight_device,

};



static struct s3c2410_platform_i2c s5p6440_i2c0_data __initdata = {