[ARM] pxa: make zylonite use the generic PWM backlight driver

Patch mostly by Eric Miao, minor edits by rmk.

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 21 insertions, 13 deletions

diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
index 9c01505b1825..b7a3281c420e 100644
--- a/arch/arm/mach-pxa/Kconfig
+++ b/arch/arm/mach-pxa/Kconfig
@@ -116,6 +116,7 @@ config MACH_COLIBRI
 config MACH_ZYLONITE
         bool "PXA3xx Development Platform"
         select PXA3xx
+        select HAVE_PWM
 
 config MACH_LITTLETON
         bool "PXA3xx Form Factor Platform (aka Littleton)"
@@ -276,6 +277,7 @@ config PXA_SSP
 
 config PXA_PWM
         tristate
+        default BACKLIGHT_PWM
         help
           Enable support for PXA2xx/PXA3xx PWM controllers
 endif
diff --git a/arch/arm/mach-pxa/zylonite.c b/arch/arm/mach-pxa/zylonite.c
index 4a0028087ea6..b13bb9385138 100644
--- a/arch/arm/mach-pxa/zylonite.c
+++ b/arch/arm/mach-pxa/zylonite.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
+#include <linux/pwm_backlight.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -28,12 +29,12 @@
 #include <asm/arch/mmc.h>
 #include <asm/arch/pxa27x_keypad.h>
 
+#include "devices.h"
 #include "generic.h"
 
 #define MAX_SLOTS       3
 struct platform_mmc_slot zylonite_mmc_slot[MAX_SLOTS];
 
-int gpio_backlight;
 int gpio_eth_irq;
 
 int wm9713_irq;
@@ -62,10 +63,20 @@ static struct platform_device smc91x_device = {
 };
 
 #if defined(CONFIG_FB_PXA) || defined(CONFIG_FB_PXA_MODULE)
-static void zylonite_backlight_power(int on)
-{
-        gpio_set_value(gpio_backlight, on);
-}
+static struct platform_pwm_backlight_data zylonite_backlight_data = {
+        .pwm_id         = 3,
+        .max_brightness = 100,
+        .dft_brightness = 100,
+        .pwm_period_ns  = 10000,
+};
+
+static struct platform_device zylonite_backlight_device = {
+        .name           = "pwm-backlight",
+        .dev            = {
+                .parent = &pxa27x_device_pwm1.dev,
+                .platform_data  = &zylonite_backlight_data,
+        },
+};
 
 static struct pxafb_mode_info toshiba_ltm035a776c_mode = {
         .pixclock               = 110000,
@@ -98,7 +109,6 @@ static struct pxafb_mode_info toshiba_ltm04c380k_mode = {
 static struct pxafb_mach_info zylonite_toshiba_lcd_info = {
         .num_modes              = 1,
         .lcd_conn               = LCD_COLOR_TFT_16BPP | LCD_PCLK_EDGE_FALL,
-        .pxafb_backlight_power  = zylonite_backlight_power,
 };
 
 static struct pxafb_mode_info sharp_ls037_modes[] = {
@@ -134,13 +144,11 @@ static struct pxafb_mach_info zylonite_sharp_lcd_info = {
         .modes                  = sharp_ls037_modes,
         .num_modes              = 2,
         .lcd_conn               = LCD_COLOR_TFT_16BPP | LCD_PCLK_EDGE_FALL,
-        .pxafb_backlight_power  = zylonite_backlight_power,
 };
 
 static void __init zylonite_init_lcd(void)
 {
-        /* backlight GPIO: output, default on */
-        gpio_direction_output(gpio_backlight, 1);
+        platform_device_register(&zylonite_backlight_device);
 
         if (lcd_id & 0x20) {
                 set_pxa_fb_info(&zylonite_sharp_lcd_info);
diff --git a/arch/arm/mach-pxa/zylonite_pxa300.c b/arch/arm/mach-pxa/zylonite_pxa300.c
index 324fb9daae28..6f7ae972b8db 100644
--- a/arch/arm/mach-pxa/zylonite_pxa300.c
+++ b/arch/arm/mach-pxa/zylonite_pxa300.c
@@ -50,6 +50,7 @@ static mfp_cfg_t common_mfp_cfg[] __initdata = {
         GPIO75_LCD_BIAS,
         GPIO76_LCD_VSYNC,
         GPIO127_LCD_CS_N,
+        GPIO20_PWM3_OUT,        /* backlight */
 
         /* BTUART */
         GPIO111_UART2_RTS,
@@ -200,9 +201,6 @@ void __init zylonite_pxa300_init(void)
                 /* detect LCD panel */
                 zylonite_detect_lcd_panel();
 
-                /* GPIO pin assignment */
-                gpio_backlight = mfp_to_gpio(MFP_PIN_GPIO20);
-
                 /* MMC card detect & write protect for controller 0 */
                 zylonite_mmc_slot[0].gpio_cd  = EXT_GPIO(0);
                 zylonite_mmc_slot[0].gpio_wp  = EXT_GPIO(2);
diff --git a/arch/arm/mach-pxa/zylonite_pxa320.c b/arch/arm/mach-pxa/zylonite_pxa320.c
index 193d07903b06..2b4fc34919ac 100644
--- a/arch/arm/mach-pxa/zylonite_pxa320.c
+++ b/arch/arm/mach-pxa/zylonite_pxa320.c
@@ -49,6 +49,7 @@ static mfp_cfg_t mfp_cfg[] __initdata = {
         GPIO15_2_LCD_LCLK,
         GPIO16_2_LCD_PCLK,
         GPIO17_2_LCD_BIAS,
+        GPIO14_PWM3_OUT,        /* backlight */
 
         /* FFUART */
         GPIO41_UART1_RXD | MFP_LPM_EDGE_FALL,
@@ -187,7 +188,6 @@ void __init zylonite_pxa320_init(void)
                 zylonite_detect_lcd_panel();
 
                 /* GPIO pin assignment */
-                gpio_backlight  = mfp_to_gpio(MFP_PIN_GPIO14);
                 gpio_eth_irq    = mfp_to_gpio(MFP_PIN_GPIO9);
 
                 /* MMC card detect & write protect for controller 0 */