This patch adds support for LCD backlight control using PWM timer
for Samsung's SMDKV210 board.

Signed-off-by: Banajit Goswami <redacted>
---
?arch/arm/mach-s5pv210/Kconfig ? ? ? ? | ? ?1 +
?arch/arm/mach-s5pv210/mach-smdkv210.c | ? 46 +++++++++++++++++++++++++++++++++
?2 files changed, 47 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig
index 53aabef..d7fd031 100644
--- a/arch/arm/mach-s5pv210/Kconfig
+++ b/arch/arm/mach-s5pv210/Kconfig

@@ -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

diff --git a/arch/arm/mach-s5pv210/mach-smdkv210.c b/arch/arm/mach-s5pv210/mach-smdkv210.c
index bc9fdb5..8833e7b 100644
--- a/arch/arm/mach-s5pv210/mach-smdkv210.c
+++ b/arch/arm/mach-s5pv210/mach-smdkv210.c

@@ -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), (0x2 << 12));

+
+ ? ? ? 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 +270,11 @@ static struct platform_device *smdkv210_devices[] __initdata = {

? ? ? ?&samsung_device_keypad,
? ? ? ?&smdkv210_dm9000,
? ? ? ?&smdkv210_lcd_lte480wv,
+ ? ? ? &s3c_device_timer[0],
+ ? ? ? &s3c_device_timer[1],
+ ? ? ? &s3c_device_timer[2],
+ ? ? ? &s3c_device_timer[3],