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ARM: S5P64X0: Add PWM backlight support on SMDK6450 

This patch adds support for LCD backlight using PWM timer for
Samsung SMDK6450 board.

Signed-off-by: Banajit Goswami <banajit.g@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Banajit Goswami 2011-07-20 23:45:22 +09:00 committed by Kukjin Kim
parent 499d296957
commit 543601f526
2 changed files with 14 additions and 41 deletions
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1
arch/arm/mach-s5p64x0/Kconfig
View File

@ -51,6 +51,7 @@ config MACH_SMDK6450
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

54
arch/arm/mach-s5p64x0/mach-smdk6450.c
View File

@ -46,6 +46,7 @@
#include <plat/adc.h>
#include <plat/ts.h>
#include <plat/s5p-time.h>
#include <plat/backlight.h>
#define SMDK6450_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | \
S3C2410_UCON_RXILEVEL | \
@ -109,45 +110,6 @@ static struct s3c2410_uartcfg smdk6450_uartcfgs[] __initdata = {
#endif
};
static int smdk6450_backlight_init(struct device *dev)
{
int ret;
ret = gpio_request(S5P6450_GPF(15), "Backlight");
if (ret) {
printk(KERN_ERR "failed to request GPF for PWM-OUT1\n");
return ret;
}
/* Configure GPIO pin with S5P6450_GPF15_PWM_TOUT1 */
s3c_gpio_cfgpin(S5P6450_GPF(15), S3C_GPIO_SFN(2));
return 0;
}
static void smdk6450_backlight_exit(struct device *dev)
{
s3c_gpio_cfgpin(S5P6450_GPF(15), S3C_GPIO_OUTPUT);
gpio_free(S5P6450_GPF(15));
}
static struct platform_pwm_backlight_data smdk6450_backlight_data = {
.pwm_id = 1,
.max_brightness = 255,
.dft_brightness = 255,
.pwm_period_ns = 78770,
.init = smdk6450_backlight_init,
.exit = smdk6450_backlight_exit,
};
static struct platform_device smdk6450_backlight_device = {
.name = "pwm-backlight",
.dev = {
.parent = &s3c_device_timer[1].dev,
.platform_data = &smdk6450_backlight_data,
},
};
static struct platform_device *smdk6450_devices[] __initdata = {
&s3c_device_adc,
&s3c_device_rtc,
@ -157,8 +119,6 @@ static struct platform_device *smdk6450_devices[] __initdata = {
&s3c_device_wdt,
&samsung_asoc_dma,
&s5p6450_device_iis0,
&s3c_device_timer[1],
&smdk6450_backlight_device,
/* s5p6450_device_spi0 will be added */
};
@ -194,6 +154,16 @@ static struct s3c2410_ts_mach_info s3c_ts_platform __initdata = {
.oversampling_shift = 2,
};
/* LCD Backlight data */
static struct samsung_bl_gpio_info smdk6450_bl_gpio_info = {
.no = S5P6450_GPF(15),
.func = S3C_GPIO_SFN(2),
};
static struct platform_pwm_backlight_data smdk6450_bl_data = {
.pwm_id = 1,
};
static void __init smdk6450_map_io(void)
{
s5p_init_io(NULL, 0, S5P64X0_SYS_ID);
@ -213,6 +183,8 @@ static void __init smdk6450_machine_init(void)
i2c_register_board_info(1, smdk6450_i2c_devs1,
ARRAY_SIZE(smdk6450_i2c_devs1));
samsung_bl_set(&smdk6450_bl_gpio_info, &smdk6450_bl_data);
platform_add_devices(smdk6450_devices, ARRAY_SIZE(smdk6450_devices));
}