drm: Add Allwinner A10 Display Engine support

The Allwinner A10 and subsequent SoCs share the same display pipeline, with
variations in the number of controllers (1 or 2), or the presence or not of
some output (HDMI, TV, VGA) or not.

Add a driver with a limited set of features for now, and we will hopefully
support all of them eventually

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

drivers/gpu/drm/Kconfig

@@ -252,6 +252,8 @@ source "drivers/gpu/drm/rcar-du/Kconfig"
 
 source "drivers/gpu/drm/shmobile/Kconfig"
 
+source "drivers/gpu/drm/sun4i/Kconfig"
+
 source "drivers/gpu/drm/omapdrm/Kconfig"
 
 source "drivers/gpu/drm/tilcdc/Kconfig"

drivers/gpu/drm/Makefile

@@ -1,4 +1,4 @@
-#
+
 # Makefile for the drm device driver.  This driver provides support for the
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
 
@@ -65,6 +65,7 @@ obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc/
 obj-$(CONFIG_DRM_RCAR_DU) += rcar-du/
 obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/
 obj-y			+= omapdrm/
+obj-$(CONFIG_DRM_SUN4I) += sun4i/
 obj-y			+= tilcdc/
 obj-$(CONFIG_DRM_QXL) += qxl/
 obj-$(CONFIG_DRM_BOCHS) += bochs/

drivers/gpu/drm/sun4i/Kconfig

@@ -0,0 +1,14 @@
+config DRM_SUN4I
+	tristate "DRM Support for Allwinner A10 Display Engine"
+	depends on DRM && ARM
+	depends on ARCH_SUNXI || COMPILE_TEST
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_PANEL
+	select REGMAP_MMIO
+	select VIDEOMODE_HELPERS
+	help
+	  Choose this option if you have an Allwinner SoC with a
+	  Display Engine. If M is selected the module will be called
+	  sun4i-drm.

drivers/gpu/drm/sun4i/Makefile

@@ -0,0 +1,10 @@
+sun4i-drm-y += sun4i_crtc.o
+sun4i-drm-y += sun4i_drv.o
+sun4i-drm-y += sun4i_framebuffer.o
+sun4i-drm-y += sun4i_layer.o
+
+sun4i-tcon-y += sun4i_tcon.o
+sun4i-tcon-y += sun4i_dotclock.o
+
+obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
+obj-$(CONFIG_DRM_SUN4I)		+= sun4i_backend.o