mirror of https://gitee.com/openkylin/linux.git
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>
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arch/arm/mach-s5p64x0
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@ -48,6 +48,7 @@ config MACH_SMDK6450
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select S3C_DEV_WDT
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select S3C64XX_DEV_SPI
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select SAMSUNG_DEV_ADC
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select SAMSUNG_DEV_PWM
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select SAMSUNG_DEV_TS
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select S5P64X0_SETUP_I2C1
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help
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@ -22,6 +22,7 @@
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#include <linux/module.h>
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#include <linux/clk.h>
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#include <linux/gpio.h>
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#include <linux/pwm_backlight.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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@ -32,6 +33,7 @@
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#include <mach/map.h>
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#include <mach/regs-clock.h>
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#include <mach/i2c.h>
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#include <mach/regs-gpio.h>
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#include <plat/regs-serial.h>
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#include <plat/gpio-cfg.h>
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@ -106,6 +108,45 @@ static struct s3c2410_uartcfg smdk6450_uartcfgs[] __initdata = {
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#endif
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};
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static int smdk6450_backlight_init(struct device *dev)
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{
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int ret;
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ret = gpio_request(S5P6450_GPF(15), "Backlight");
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if (ret) {
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printk(KERN_ERR "failed to request GPF for PWM-OUT1\n");
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return ret;
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}
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/* Configure GPIO pin with S5P6450_GPF15_PWM_TOUT1 */
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s3c_gpio_cfgpin(S5P6450_GPF(15), S3C_GPIO_SFN(2));
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return 0;
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}
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static void smdk6450_backlight_exit(struct device *dev)
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{
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s3c_gpio_cfgpin(S5P6450_GPF(15), S3C_GPIO_OUTPUT);
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gpio_free(S5P6450_GPF(15));
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}
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static struct platform_pwm_backlight_data smdk6450_backlight_data = {
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.pwm_id = 1,
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.max_brightness = 255,
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.dft_brightness = 255,
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.pwm_period_ns = 78770,
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.init = smdk6450_backlight_init,
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.exit = smdk6450_backlight_exit,
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};
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static struct platform_device smdk6450_backlight_device = {
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.name = "pwm-backlight",
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.dev = {
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.parent = &s3c_device_timer[1].dev,
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.platform_data = &smdk6450_backlight_data,
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},
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};
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static struct platform_device *smdk6450_devices[] __initdata = {
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&s3c_device_adc,
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&s3c_device_rtc,
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@ -115,6 +156,8 @@ static struct platform_device *smdk6450_devices[] __initdata = {
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&s3c_device_wdt,
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&samsung_asoc_dma,
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&s5p6450_device_iis0,
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&s3c_device_timer[1],
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&smdk6450_backlight_device,
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/* s5p6450_device_spi0 will be added */
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};
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