ARM: pxa: hx4700: Fix backlight PWM device number

Recent changes to PXA PWM support changed the PXA27X PWM device
numbering scheme.

The linux-3.5 PXA PWM driver followed the hardware numbering scheme for
the 4 PWMs, while the linux-3.6-rc1 PXA PWM driver has adopted a linear
numbering scheme:

Address		Hardware	3.5 pwm_id	3.6-rc1 pwm_id
0x40b00000	PWM0		0		0
0x40b00010	PWM2		2		1
0x40c00000	PWM1		1		2
0x40c00010	PWM3		3		3

The hx4700 backlight uses PWM1 at 0x40c00000. Consequently the pwm_id
must be changed from 1 to 2.

This patch fixes the backlight PWM device number and at the same time
moves from the legacy PWM API (pwm_id) to the new PWM API (pwm_lookup).

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

arch/arm/mach-pxa/hx4700.c

@@ -28,6 +28,7 @@
 #include <linux/mfd/asic3.h>
 #include <linux/mtd/physmap.h>
 #include <linux/pda_power.h>
+#include <linux/pwm.h>
 #include <linux/pwm_backlight.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/gpio-regulator.h>
@@ -556,7 +557,7 @@ static struct platform_device hx4700_lcd = {
  */
 
 static struct platform_pwm_backlight_data backlight_data = {
-	.pwm_id         = 1,
+	.pwm_id         = -1,	/* Superseded by pwm_lookup */
 	.max_brightness = 200,
 	.dft_brightness = 100,
 	.pwm_period_ns  = 30923,
@@ -571,6 +572,10 @@ static struct platform_device backlight = {
 	},
 };
 
+static struct pwm_lookup hx4700_pwm_lookup[] = {
+	PWM_LOOKUP("pxa27x-pwm.1", 0, "pwm-backlight", NULL),
+};
+
 /*
  * USB "Transceiver"
  */
@@ -872,6 +877,7 @@ static void __init hx4700_init(void)
 	pxa_set_stuart_info(NULL);
 
 	platform_add_devices(devices, ARRAY_SIZE(devices));
+	pwm_add_table(hx4700_pwm_lookup, ARRAY_SIZE(hx4700_pwm_lookup));
 
 	pxa_set_ficp_info(&ficp_info);
 	pxa27x_set_i2c_power_info(NULL);