[media] Cleanup media Kconfig files

- get rid of ridden V4L2_COMMON symbol

  This symbol is not needed anymore; it can be folded with V4L2
  one, simplifying the Kconfig a little bit;

- Comment why some Kconfig items are needed;

- Remove if test for MEDIA_CAMERA_SUPPORT, replacing it by
  depends on.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/Kconfig

@@ -99,11 +99,6 @@ config VIDEO_DEV
 	depends on MEDIA_CAMERA_SUPPORT || MEDIA_ANALOG_TV_SUPPORT || MEDIA_RADIO_SUPPORT
 	default y
 
-config VIDEO_V4L2_COMMON
-	tristate
-	depends on (I2C || I2C=n) && VIDEO_DEV
-	default (I2C || I2C=n) && VIDEO_DEV
-
 config VIDEO_V4L2_SUBDEV_API
 	bool "V4L2 sub-device userspace API (EXPERIMENTAL)"
 	depends on VIDEO_DEV && MEDIA_CONTROLLER && EXPERIMENTAL

drivers/media/i2c/Kconfig

@@ -322,7 +322,7 @@ comment "MPEG video encoders"
 
 config VIDEO_CX2341X
 	tristate "Conexant CX2341x MPEG encoders"
-	depends on VIDEO_V4L2 && VIDEO_V4L2_COMMON
+	depends on VIDEO_V4L2
 	---help---
 	  Support for the Conexant CX23416 MPEG encoders
 	  and CX23415 MPEG encoder/decoders.

drivers/media/platform/Kconfig

-if MEDIA_CAMERA_SUPPORT
-
 #
 # Platform drivers
 #	All drivers here are currently for webcam support
@@ -37,6 +35,7 @@ source "drivers/media/platform/blackfin/Kconfig"
 
 config VIDEO_SH_VOU
 	tristate "SuperH VOU video output driver"
+	depends on MEDIA_CAMERA_SUPPORT
 	depends on VIDEO_DEV && ARCH_SHMOBILE
 	select VIDEOBUF_DMA_CONTIG
 	help
@@ -119,6 +118,7 @@ endif # V4L_PLATFORM_DRIVERS
 menuconfig V4L_MEM2MEM_DRIVERS
 	bool "Memory-to-memory multimedia devices"
 	depends on VIDEO_V4L2
+	depends on MEDIA_CAMERA_SUPPORT
 	default n
 	---help---
 	  Say Y here to enable selecting drivers for V4L devices that
@@ -212,5 +212,3 @@ config VIDEO_MEM2MEM_TESTDEV
 	  This is a virtual test device for the memory-to-memory driver
 	  framework.
 endif #V4L_TEST_DRIVERS
-
-endif # MEDIA_CAMERA_SUPPORT

drivers/media/v4l2-core/Kconfig

@@ -2,6 +2,12 @@
 # Generic video config states
 #
 
+# Enable the V4L2 core and API
+config VIDEO_V4L2
+	tristate
+	depends on (I2C || I2C=n) && VIDEO_DEV
+	default (I2C || I2C=n) && VIDEO_DEV
+
 config VIDEO_ADV_DEBUG
 	bool "Enable advanced debug functionality on V4L2 drivers"
 	default n
@@ -19,11 +25,17 @@ config VIDEO_FIXED_MINOR_RANGES
 
 	  When in doubt, say N.
 
-config VIDEO_V4L2
+# Used by drivers that need tuner.ko
+config VIDEO_TUNER
+	tristate
+	depends on MEDIA_TUNER
+
+# Used by drivers that need v4l2-mem2mem.ko
+config V4L2_MEM2MEM_DEV
         tristate
-	depends on VIDEO_V4L2_COMMON
-	default y
+        depends on VIDEOBUF2_CORE
 
+# Used by drivers that need Videobuf modules
 config VIDEOBUF_GEN
 	tristate
 
@@ -45,14 +57,7 @@ config VIDEOBUF_DVB
 	tristate
 	select VIDEOBUF_GEN
 
-config VIDEO_TUNER
-	tristate
-	depends on MEDIA_TUNER
-
-config V4L2_MEM2MEM_DEV
-        tristate
-        depends on VIDEOBUF2_CORE
-
+# Used by drivers that need Videobuf2 modules
 config VIDEOBUF2_CORE
 	tristate
 

drivers/media/v4l2-core/Makefile

@@ -11,7 +11,7 @@ ifeq ($(CONFIG_COMPAT),y)
 endif
 
 obj-$(CONFIG_VIDEO_DEV) += videodev.o v4l2-int-device.o
-obj-$(CONFIG_VIDEO_V4L2_COMMON) += v4l2-common.o
+obj-$(CONFIG_VIDEO_V4L2) += v4l2-common.o
 
 obj-$(CONFIG_VIDEO_TUNER) += tuner.o