[PATCH] backlight: add PWM dependencies

[Linus Walleij]

In some compilations the LM3630A and LP855X backlight drivers
fail like this:

drivers/built-in.o: In function `lm3630a_pwm_ctrl':
drivers/video/backlight/lm3630a_bl.c:168: undefined reference to `pwm_config'
drivers/video/backlight/lm3630a_bl.c:172: undefined reference to `pwm_disable'
drivers/video/backlight/lm3630a_bl.c:170: undefined reference to `pwm_enable'
drivers/built-in.o: In function `lp855x_pwm_ctrl':
drivers/video/backlight/lp855x_bl.c:249: undefined reference to `pwm_config'
drivers/video/backlight/lp855x_bl.c:253: undefined reference to `pwm_disable'
drivers/video/backlight/lp855x_bl.c:251: undefined reference to `pwm_enable'

This is because both drivers depend on the PWM framework, so
add this dependency to their Kconfig entries.

Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
 drivers/video/backlight/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 5a3eb2ecb525..0604c3348761 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -371,6 +371,7 @@ config BACKLIGHT_AAT2870
 config BACKLIGHT_LM3630A
 	tristate "Backlight Driver for LM3630A"
 	depends on BACKLIGHT_CLASS_DEVICE && I2C
+	depends on PWM
 	select REGMAP_I2C
 	help
 	  This supports TI LM3630A Backlight Driver
@@ -387,6 +388,7 @@ config BACKLIGHT_LM3639
 config BACKLIGHT_LP855X
 	tristate "Backlight driver for TI LP855X"
 	depends on BACKLIGHT_CLASS_DEVICE && I2C
+	depends on PWM
 	help
 	  This supports TI LP8550, LP8551, LP8552, LP8553, LP8555, LP8556 and
 	  LP8557 backlight driver.
-- 
1.8.5.3