drm/sun4i: add a Kconfig option for sun4i-backend

As sun4i-backend is now a dedicated module, add an Kconfig option for
it to make it optional, since some build may only use other engines.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

2 files changed, 12 insertions, 1 deletions

diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
index a4b357db8856..5a8227f37cc4 100644
--- a/drivers/gpu/drm/sun4i/Kconfig
+++ b/drivers/gpu/drm/sun4i/Kconfig
@@ -12,3 +12,13 @@ config DRM_SUN4I
           Choose this option if you have an Allwinner SoC with a
           Display Engine. If M is selected the module will be called
           sun4i-drm.
+
+config DRM_SUN4I_BACKEND
+        tristate "Support for Allwinner A10 Display Engine Backend"
+        depends on DRM_SUN4I
+        default DRM_SUN4I
+        help
+          Choose this option if you have an Allwinner SoC with the
+          original Allwinner Display Engine, which has a backend to
+          do some alpha blending and feed graphics to TCON. If M is
+          selected the module will be called sun4i-backend.
diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index a251fb36c951..da561d064ab8 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -9,6 +9,7 @@ sun4i-tcon-y += sun4i_crtc.o
 sun4i-backend-y += sun4i_backend.o sun4i_layer.o
 
 obj-$(CONFIG_DRM_SUN4I)         += sun4i-drm.o sun4i-tcon.o
-obj-$(CONFIG_DRM_SUN4I)         += sun4i-backend.o
 obj-$(CONFIG_DRM_SUN4I)         += sun6i_drc.o
 obj-$(CONFIG_DRM_SUN4I)         += sun4i_tv.o
+
+obj-$(CONFIG_DRM_SUN4I_BACKEND)         += sun4i-backend.o