[ARM] pxa/cm-x300: add PWM backlight support

Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

2 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
index 6f4f475bbc3d..8a0837ea0294 100644
--- a/arch/arm/mach-pxa/Kconfig
+++ b/arch/arm/mach-pxa/Kconfig
@@ -110,6 +110,8 @@ config MACH_CM_X300
         bool "CompuLab CM-X300 modules"
         select PXA3xx
         select CPU_PXA300
+        select CPU_PXA310
+        select HAVE_PWM
 
 config ARCH_GUMSTIX
         bool "Gumstix XScale 255 boards"
diff --git a/arch/arm/mach-pxa/cm-x300.c b/arch/arm/mach-pxa/cm-x300.c
index d564d8ea5a33..d37cfa132a65 100644
--- a/arch/arm/mach-pxa/cm-x300.c
+++ b/arch/arm/mach-pxa/cm-x300.c
@@ -24,6 +24,7 @@
 #include <linux/dm9000.h>
 #include <linux/leds.h>
 #include <linux/rtc-v3020.h>
+#include <linux/pwm_backlight.h>
 
 #include <linux/i2c.h>
 #include <linux/i2c/pca953x.h>
@@ -50,6 +51,7 @@
 #include <asm/mach/map.h>
 
 #include "generic.h"
+#include "devices.h"
 
 #define CM_X300_ETH_PHYS        0x08000010
 
@@ -160,6 +162,9 @@ static mfp_cfg_t cm_x3xx_mfp_cfg[] __initdata = {
         /* Standard I2C */
         GPIO21_I2C_SCL,
         GPIO22_I2C_SDA,
+
+        /* PWM Backlight */
+        GPIO19_PWM2_OUT,
 };
 
 static mfp_cfg_t cm_x3xx_rev_lt130_mfp_cfg[] __initdata = {
@@ -290,6 +295,30 @@ static void __init cm_x300_init_lcd(void)
 static inline void cm_x300_init_lcd(void) {}
 #endif
 
+#if defined(CONFIG_BACKLIGHT_PWM) || defined(CONFIG_BACKLIGHT_PWM_MODULE)
+static struct platform_pwm_backlight_data cm_x300_backlight_data = {
+        .pwm_id         = 2,
+        .max_brightness = 100,
+        .dft_brightness = 100,
+        .pwm_period_ns  = 10000,
+};
+
+static struct platform_device cm_x300_backlight_device = {
+        .name           = "pwm-backlight",
+        .dev            = {
+                .parent = &pxa27x_device_pwm0.dev,
+                .platform_data  = &cm_x300_backlight_data,
+        },
+};
+
+static void cm_x300_init_bl(void)
+{
+        platform_device_register(&cm_x300_backlight_device);
+}
+#else
+static inline void cm_x300_init_bl(void) {}
+#endif
+
 #if defined(CONFIG_SPI_GPIO) || defined(CONFIG_SPI_GPIO_MODULE)
 #define GPIO_LCD_BASE   (144)
 #define GPIO_LCD_DIN    (GPIO_LCD_BASE + 8)     /* aux_gpio3_0 */
@@ -654,6 +683,7 @@ static void __init cm_x300_init(void)
         cm_x300_init_rtc();
         cm_x300_init_ac97();
         cm_x300_init_wi2wi();
+        cm_x300_init_bl();
 }
 
 static void __init cm_x300_fixup(struct machine_desc *mdesc, struct tag *tags,