ARM: SAMSUNG: Add PWM backlight support on Samsung S3C6410
This patch adds support for LCD backlight using PWM timer for
Samsung SMDK6410 board.
Signed-off-by: Banajit Goswami <banajit.g@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-s3c64xx/Kconfig b/arch/arm/mach-s3c64xx/Kconfig
index f3a953f..e4177e2 100644
--- a/arch/arm/mach-s3c64xx/Kconfig
+++ b/arch/arm/mach-s3c64xx/Kconfig
@@ -143,6 +143,7 @@
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
diff --git a/arch/arm/mach-s3c64xx/mach-smdk6410.c b/arch/arm/mach-s3c64xx/mach-smdk6410.c
index e85192a..6639cce 100644
--- a/arch/arm/mach-s3c64xx/mach-smdk6410.c
+++ b/arch/arm/mach-s3c64xx/mach-smdk6410.c
@@ -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 @@
{
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 @@
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 @@
.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 @@
&s3c_device_rtc,
&s3c_device_ts,
&s3c_device_wdt,
+ &s3c_device_timer[1],
+ &smdk6410_backlight_device,
};
#ifdef CONFIG_REGULATOR
@@ -693,7 +734,6 @@
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));
