video/cmdline: Introduce CONFIG_VIDEO for video= parameter

Add CONFIG_VIDEO for common code in drivers/video/. Use the option to
select helpers for the video= parameter. Replaces CONFIG_VIDEO_CMDLINE.

Other common code in drivers/video/ can be moved behind CONFIG_VIDEO,
which will simplify the Kconfig rules.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20240118090721.7995-2-tzimmermann@suse.de

drivers/gpu/drm/Kconfig

@@ -19,7 +19,7 @@ menuconfig DRM
 # gallium uses SYS_kcmp for os_same_file_description() to de-duplicate
 # device and dmabuf fd. Let's make sure that is available for our userspace.
 	select KCMP
-	select VIDEO_CMDLINE
+	select VIDEO
 	select VIDEO_NOMODESET
 	help
 	  Kernel-level support for the Direct Rendering Infrastructure (DRI)

drivers/video/Kconfig

@@ -18,8 +18,9 @@ config STI_CORE
 	  STI refers to the HP "Standard Text Interface" which is a set of
 	  BIOS routines contained in a ROM chip in HP PA-RISC based machines.
 
-config VIDEO_CMDLINE
+config VIDEO
 	bool
+	default n
 
 config VIDEO_NOMODESET
 	bool

drivers/video/Makefile

@@ -3,7 +3,7 @@
 obj-$(CONFIG_APERTURE_HELPERS)    += aperture.o
 obj-$(CONFIG_STI_CORE)            += sticore.o
 obj-$(CONFIG_VGASTATE)            += vgastate.o
-obj-$(CONFIG_VIDEO_CMDLINE)       += cmdline.o
+obj-$(CONFIG_VIDEO)               += cmdline.o
 obj-$(CONFIG_VIDEO_NOMODESET)     += nomodeset.o
 obj-$(CONFIG_HDMI)                += hdmi.o
 

drivers/video/fbdev/core/Kconfig

@@ -4,7 +4,7 @@
 #
 
 config FB_CORE
-	select VIDEO_CMDLINE
+	select VIDEO
 	tristate
 
 config FB_NOTIFY

include/video/cmdline.h

@@ -5,16 +5,9 @@
 
 #include <linux/types.h>
 
-#if defined(CONFIG_VIDEO_CMDLINE)
 const char *video_get_options(const char *name);
 
 /* exported for compatibility with fbdev; don't use in new code */
 bool __video_get_options(const char *name, const char **option, bool is_of);
-#else
-static inline const char *video_get_options(const char *name)
-{
-	return NULL;
-}
-#endif
 
 #endif