drivers/tosa: driver needs I2C and SPI to compile

This driver requires both SPI and I2C to build.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index af16884..d7487d2 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -88,7 +88,7 @@
 
 config LCD_TOSA
 	tristate "Sharp SL-6000 LCD Driver"
-	depends on SPI && MACH_TOSA
+	depends on I2C && SPI && MACH_TOSA
 	help
 	  If you have an Sharp SL-6000 Zaurus say Y to enable a driver
 	  for its LCD.