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Commit 499d2969 authored by Banajit Goswami's avatar Banajit Goswami Committed by Kukjin Kim
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ARM: S5P64X0: Add PWM backlight support on SMDK6440 



This patch adds support for LCD backlight 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 1cad6766

arch/arm/mach-s5p64x0/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ config MACH_SMDK6440 
	select S3C_DEV_WDT

	select S3C64XX_DEV_SPI

	select SAMSUNG_DEV_ADC

	select SAMSUNG_DEV_BACKLIGHT

	select SAMSUNG_DEV_PWM

	select SAMSUNG_DEV_TS

	select S5P64X0_SETUP_I2C1

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

+13 −41
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ 
#include <plat/adc.h>

#include <plat/ts.h>

#include <plat/s5p-time.h>

#include <plat/backlight.h>



#define SMDK6440_UCON_DEFAULT	(S3C2410_UCON_TXILEVEL |	\

				S3C2410_UCON_RXILEVEL |		\
@@ -91,45 +92,6 @@ 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,
@@ -139,8 +101,6 @@ 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 = {
@@ -175,6 +135,16 @@ static struct s3c2410_ts_mach_info s3c_ts_platform __initdata = { 
	.oversampling_shift	= 2,

};



/* LCD Backlight data */

static struct samsung_bl_gpio_info smdk6440_bl_gpio_info = {

	.no = S5P6440_GPF(15),

	.func = S3C_GPIO_SFN(2),

};



static struct platform_pwm_backlight_data smdk6440_bl_data = {

	.pwm_id = 1,

};



static void __init smdk6440_map_io(void)

{

	s5p_init_io(NULL, 0, S5P64X0_SYS_ID);
@@ -194,6 +164,8 @@ static void __init smdk6440_machine_init(void) 
	i2c_register_board_info(1, smdk6440_i2c_devs1,

			ARRAY_SIZE(smdk6440_i2c_devs1));



	samsung_bl_set(&smdk6440_bl_gpio_info, &smdk6440_bl_data);



	platform_add_devices(smdk6440_devices, ARRAY_SIZE(smdk6440_devices));

}