video/backlight: LP855X needs PWM

The LP855X driver cannot be successfully built if we don't
enable the PWM subsystem. This patch makes that dependency
explicit in Kconfig and prevents broken randconfig builds.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Bryan Wu <cooloney@gmail.com>
Acked-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 88f95581f1adb1a35b9256a99278231d8c18390c..3e393026dc8178e7975baa690af08a1bba308e6d 100644 (file)
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -386,7 +386,7 @@ config BACKLIGHT_LM3639
 
 config BACKLIGHT_LP855X
        tristate "Backlight driver for TI LP855X"
-       depends on BACKLIGHT_CLASS_DEVICE && I2C
+       depends on BACKLIGHT_CLASS_DEVICE && I2C && PWM
        help
          This supports TI LP8550, LP8551, LP8552, LP8553, LP8555, LP8556 and
          LP8557 backlight driver.