[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>

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

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);

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);

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 */

include/asm-arm/arch-pxa/zylonite.h

@@ -15,7 +15,6 @@ struct platform_mmc_slot {
 
 extern struct platform_mmc_slot zylonite_mmc_slot[];
 
-extern int gpio_backlight;
 extern int gpio_eth_irq;
 
 extern int wm9713_irq;