ARM: pxa/raumfeld: adapt to upcoming hardware change

The backlight control is going to change back to PWM in the
upcoming Raumfeld Controller hardware revision.

Signed-off-by: Sven Neumann <s.neumann@raumfeld.com>
Acked-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/arm/mach-pxa/raumfeld.c b/arch/arm/mach-pxa/raumfeld.c
index d130f77b6d11..8e5b3d8a86be 100644
--- a/arch/arm/mach-pxa/raumfeld.c
+++ b/arch/arm/mach-pxa/raumfeld.c
@@ -598,14 +598,15 @@ static void __init raumfeld_lcd_init(void)
 
         pxa_set_fb_info(NULL, &raumfeld_sharp_lcd_info);
 
-        /* Earlier devices had the backlight regulator controlled
-         * via PWM, later versions use another controller for that */
-        if ((system_rev & 0xff) < 2) {
+        /* Hardware revision 2 has the backlight regulator controlled
+         * by an LT3593, earlier and later devices use PWM for that. */
+        if ((system_rev & 0xff) == 2) {
+                platform_device_register(&raumfeld_lt3593_device);
+        } else {
                 mfp_cfg_t raumfeld_pwm_pin_config = GPIO17_PWM0_OUT;
                 pxa3xx_mfp_config(&raumfeld_pwm_pin_config, 1);
                 platform_device_register(&raumfeld_pwm_backlight_device);
-        } else
-                platform_device_register(&raumfeld_lt3593_device);
+        }
 
         ret = gpio_request(GPIO_TFT_VA_EN, "display VA enable");
         if (ret < 0)