[PATCH V2 2/6] ARM: SAMSUNG: Add PWM backlight support on Samsung S3C6410

@@ -143,6 +143,7 @@ config MACH_SMDK6410
 	select S3C_DEV_USB_HSOTG
 	select S3C_DEV_WDT
 	select SAMSUNG_DEV_KEYPAD
+	select SAMSUNG_DEV_PWM
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
 	select S3C64XX_SETUP_SDHCI
 	select S3C64XX_SETUP_I2C1

@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/smsc911x.h>
 #include <linux/regulator/fixed.h>
+#include <linux/pwm_backlight.h>
 
 #ifdef CONFIG_SMDK6410_WM1190_EV1
 #include <linux/mfd/wm8350/core.h>

@@ -48,6 +49,7 @@
 #include <mach/hardware.h>
 #include <mach/regs-fb.h>
 #include <mach/map.h>
+#include <mach/gpio-bank-f.h>
 
 #include <asm/irq.h>
 #include <asm/mach-types.h>

@@ -118,7 +120,6 @@ static void smdk6410_lcd_power_set(struct plat_lcd_data *pd,
 {
 	if (power) {
 		gpio_direction_output(S3C64XX_GPF(13), 1);
-		gpio_direction_output(S3C64XX_GPF(15), 1);
 
 		/* fire nRESET on power up */
 		gpio_direction_output(S3C64XX_GPN(5), 0);

@@ -126,7 +127,6 @@ static void smdk6410_lcd_power_set(struct plat_lcd_data *pd,
 		gpio_direction_output(S3C64XX_GPN(5), 1);
 		msleep(1);
 	} else {
-		gpio_direction_output(S3C64XX_GPF(15), 0);
 		gpio_direction_output(S3C64XX_GPF(13), 0);
 	}
 }

@@ -269,6 +269,45 @@ static struct samsung_keypad_platdata smdk6410_keypad_data __initdata = {
 	.cols		= 8,
 };
 
+static int smdk6410_backlight_init(struct device *dev)
+{
+	int ret;
+
+	ret = gpio_request(S3C64XX_GPF(15), "Backlight");
+	if (ret) {
+		printk(KERN_ERR "failed to request GPF for PWM-OUT1\n");
+		return ret;
+	}
+
+	/* Configure GPIO pin with S3C64XX_GPF15_PWM_TOUT1 */
+	s3c_gpio_cfgpin(S3C64XX_GPF(15), S3C_GPIO_SFN(2));
+
+	return 0;
+}
+
+static void smdk6410_backlight_exit(struct device *dev)
+{
+	s3c_gpio_cfgpin(S3C64XX_GPF(15), S3C_GPIO_OUTPUT);
+	gpio_free(S3C64XX_GPF(15));
+}
+
+static struct platform_pwm_backlight_data smdk6410_backlight_data = {
+	.pwm_id		= 1,
+	.max_brightness	= 255,
+	.dft_brightness	= 255,
+	.pwm_period_ns	= 78770,
+	.init		= smdk6410_backlight_init,
+	.exit		= smdk6410_backlight_exit,
+};
+
+static struct platform_device smdk6410_backlight_device = {
+	.name		= "pwm-backlight",
+	.dev		= {
+		.parent		= &s3c_device_timer[1].dev,
+		.platform_data	= &smdk6410_backlight_data,
+	},
+};
+
 static struct map_desc smdk6410_iodesc[] = {};
 
 static struct platform_device *smdk6410_devices[] __initdata = {

@@ -298,6 +337,8 @@ static struct platform_device *smdk6410_devices[] __initdata = {
 	&s3c_device_rtc,
 	&s3c_device_ts,
 	&s3c_device_wdt,
+	&s3c_device_timer[1],
+	&smdk6410_backlight_device,
 };
 
 #ifdef CONFIG_REGULATOR

@@ -693,7 +735,6 @@ static void __init smdk6410_machine_init(void)
 
 	gpio_request(S3C64XX_GPN(5), "LCD power");
 	gpio_request(S3C64XX_GPF(13), "LCD power");
-	gpio_request(S3C64XX_GPF(15), "LCD power");
 
 	i2c_register_board_info(0, i2c_devs0, ARRAY_SIZE(i2c_devs0));
 	i2c_register_board_info(1, i2c_devs1, ARRAY_SIZE(i2c_devs1));

@@ -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

@@ -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 = {

@@ -48,6 +48,7 @@ config MACH_SMDK6450
 	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

@@ -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>

@@ -106,6 +108,45 @@ 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,

@@ -115,6 +156,8 @@ 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 */
 };
 

@@ -58,6 +58,7 @@ config MACH_SMDKC100
 	select SAMSUNG_DEV_ADC
 	select SAMSUNG_DEV_IDE
 	select SAMSUNG_DEV_KEYPAD
+	select SAMSUNG_DEV_PWM
 	select SAMSUNG_DEV_TS
 	select S5PC100_SETUP_FB_24BPP
 	select S5PC100_SETUP_I2C1

@@ -23,12 +23,15 @@
 #include <linux/fb.h>
 #include <linux/delay.h>
 #include <linux/input.h>
+#include <linux/pwm_backlight.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 
 #include <mach/map.h>
 #include <mach/regs-fb.h>
+#include <mach/regs-gpio.h>
+
 #include <video/platform_lcd.h>
 
 #include <asm/irq.h>

@@ -107,9 +110,6 @@ static struct i2c_board_info i2c_devs1[] __initdata = {
 static void smdkc100_lcd_power_set(struct plat_lcd_data *pd,
 				   unsigned int power)
 {
-	/* backlight */
-	gpio_direction_output(S5PC100_GPD(0), power);
-
 	if (power) {
 		/* module reset */
 		gpio_direction_output(S5PC100_GPH0(6), 1);

@@ -178,6 +178,45 @@ static struct samsung_keypad_platdata smdkc100_keypad_data __initdata = {
 	.rows		= 2,
 	.cols		= 8,
 };
+
+static int smdkc100_backlight_init(struct device *dev)
+{
+	int ret;
+
+	ret = gpio_request(S5PC100_GPD(0), "Backlight");
+	if (ret) {
+		printk(KERN_ERR "failed to request GPF for PWM-OUT0\n");
+		return ret;
+	}
+
+	/* Configure GPIO pin with S5PC100_GPD_TOUT_0 */
+	s3c_gpio_cfgpin(S5PC100_GPD(0), S3C_GPIO_SFN(2));
+
+	return 0;
+}
+
+static void smdkc100_backlight_exit(struct device *dev)
+{
+	s3c_gpio_cfgpin(S5PC100_GPD(0), S3C_GPIO_OUTPUT);
+	gpio_free(S5PC100_GPD(0));
+}
+
+static struct platform_pwm_backlight_data smdkc100_backlight_data = {
+	.pwm_id		= 0,
+	.max_brightness	= 255,
+	.dft_brightness	= 255,
+	.pwm_period_ns	= 78770,
+	.init		= smdkc100_backlight_init,
+	.exit		= smdkc100_backlight_exit,
+};
+
+static struct platform_device smdkc100_backlight_device = {
+	.name		= "pwm-backlight",
+	.dev		= {
+		.parent		= &s3c_device_timer[0].dev,
+		.platform_data	= &smdkc100_backlight_data,
+	},
+};
 
 static struct platform_device *smdkc100_devices[] __initdata = {
 	&s3c_device_adc,

@@ -200,6 +238,8 @@ static struct platform_device *smdkc100_devices[] __initdata = {
 	&s5p_device_fimc1,
 	&s5p_device_fimc2,
 	&s5pc100_device_spdif,
+	&s3c_device_timer[0],
+	&smdkc100_backlight_device,
 };
 
 static struct s3c2410_ts_mach_info s3c_ts_platform __initdata = {

@@ -233,7 +274,6 @@ static void __init smdkc100_machine_init(void)
 	s5pc100_spdif_setup_gpio(S5PC100_SPDIF_GPD);
 
 	/* LCD init */
-	gpio_request(S5PC100_GPD(0), "GPD");
 	gpio_request(S5PC100_GPH0(6), "GPH0");
 	smdkc100_lcd_power_set(&smdkc100_lcd_power_data, 0);
 	platform_add_devices(smdkc100_devices, ARRAY_SIZE(smdkc100_devices));

@@ -130,6 +130,7 @@ config MACH_SMDKV210
 	select SAMSUNG_DEV_ADC
 	select SAMSUNG_DEV_IDE
 	select SAMSUNG_DEV_KEYPAD
+	select SAMSUNG_DEV_PWM
 	select SAMSUNG_DEV_TS
 	select S5PV210_SETUP_FB_24BPP
 	select S5PV210_SETUP_I2C1

@@ -18,6 +18,7 @@
 #include <linux/fb.h>
 #include <linux/gpio.h>
 #include <linux/delay.h>
+#include <linux/pwm_backlight.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>

@@ -43,6 +44,7 @@
 #include <plat/keypad.h>
 #include <plat/pm.h>
 #include <plat/fb.h>
+#include <plat/gpio-cfg.h>
 
 /* Following are default values for UCON, ULCON and UFCON UART registers */
 #define SMDKV210_UCON_DEFAULT	(S3C2410_UCON_TXILEVEL |	\

@@ -208,6 +210,45 @@ static struct s3c_fb_platdata smdkv210_lcd0_pdata __initdata = {
 	.setup_gpio	= s5pv210_fb_gpio_setup_24bpp,
 };
 
+static int smdkv210_backlight_init(struct device *dev)
+{
+	int ret;
+
+	ret = gpio_request(S5PV210_GPD0(3), "Backlight");
+	if (ret) {
+		printk(KERN_ERR "failed to request GPD for PWM-OUT 3\n");
+		return ret;
+	}
+
+	/* Configure GPIO pin with S5PV210_GPD_0_3_TOUT_3 */
+	s3c_gpio_cfgpin(S5PV210_GPD0(3), S3C_GPIO_SFN(2));
+
+	return 0;
+}
+
+static void smdkv210_backlight_exit(struct device *dev)
+{
+	s3c_gpio_cfgpin(S5PV210_GPD0(3), S3C_GPIO_OUTPUT);
+	gpio_free(S5PV210_GPD0(3));
+}
+
+static struct platform_pwm_backlight_data smdkv210_backlight_data = {
+	.pwm_id		= 3,
+	.max_brightness	= 255,
+	.dft_brightness	= 255,
+	.pwm_period_ns	= 78770,
+	.init		= smdkv210_backlight_init,
+	.exit		= smdkv210_backlight_exit,
+};
+
+static struct platform_device smdkv210_backlight_device = {
+	.name		= "pwm-backlight",
+	.dev		= {
+		.parent		= &s3c_device_timer[3].dev,
+		.platform_data	= &smdkv210_backlight_data,
+	},
+};
+
 static struct platform_device *smdkv210_devices[] __initdata = {
 	&s3c_device_adc,
 	&s3c_device_cfcon,

@@ -229,6 +270,8 @@ static struct platform_device *smdkv210_devices[] __initdata = {
 	&samsung_device_keypad,
 	&smdkv210_dm9000,
 	&smdkv210_lcd_lte480wv,
+	&s3c_device_timer[3],
+	&smdkv210_backlight_device,
 };
 
 static void __init smdkv210_dm9000_init(void)