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ARM: SAMSUNG: Add PWM backlight support on Samsung S5P6450 

This patch adds support for LCD backlight control 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 2011-02-28 23:31:17 +05:30 committed by Kukjin Kim
parent fec524aa05
commit b0fd644f44
2 changed files with 44 additions and 0 deletions
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1
arch/arm/mach-s5p64x0/Kconfig
View File

@ -48,6 +48,7 @@ config MACH_SMDK6450
select S3C_DEV_WDT select S3C_DEV_WDT
select S3C64XX_DEV_SPI select S3C64XX_DEV_SPI
select SAMSUNG_DEV_ADC select SAMSUNG_DEV_ADC
select SAMSUNG_DEV_PWM
select SAMSUNG_DEV_TS select SAMSUNG_DEV_TS
select S5P64X0_SETUP_I2C1 select S5P64X0_SETUP_I2C1
help help

43
arch/arm/mach-s5p64x0/mach-smdk6450.c
View File

@ -22,6 +22,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/gpio.h> #include <linux/gpio.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>
@ -32,6 +33,7 @@
#include <mach/map.h> #include <mach/map.h>
#include <mach/regs-clock.h> #include <mach/regs-clock.h>
#include <mach/i2c.h> #include <mach/i2c.h>
#include <mach/regs-gpio.h>
#include <plat/regs-serial.h> #include <plat/regs-serial.h>
#include <plat/gpio-cfg.h> #include <plat/gpio-cfg.h>
@ -106,6 +108,45 @@ static struct s3c2410_uartcfg smdk6450_uartcfgs[] __initdata = {
#endif #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 = { static struct platform_device *smdk6450_devices[] __initdata = {
&s3c_device_adc, &s3c_device_adc,
&s3c_device_rtc, &s3c_device_rtc,
@ -115,6 +156,8 @@ static struct platform_device *smdk6450_devices[] __initdata = {
&s3c_device_wdt, &s3c_device_wdt,
&samsung_asoc_dma, &samsung_asoc_dma,
&s5p6450_device_iis0, &s5p6450_device_iis0,
&s3c_device_timer[1],
&smdk6450_backlight_device,
/* s5p6450_device_spi0 will be added */ /* s5p6450_device_spi0 will be added */
}; };