drm: renesas: Add RZ/G2L DU Support

The LCD controller is composed of Frame Compression Processor (FCPVD),
Video Signal Processor (VSPD), and Display Unit (DU).

It has DPI/DSI interfaces and supports a maximum resolution of 1080p
along with 2 RPFs to support the blending of two picture layers and
raster operations (ROPs).

The DU module is connected to VSPD. Add RZ/G2L DU support for RZ/G2L
alike SoCs.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20240218164840.57662-4-biju.das.jz@bp.renesas.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

drivers/gpu/drm/renesas/Kconfig

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
 source "drivers/gpu/drm/renesas/rcar-du/Kconfig"
+source "drivers/gpu/drm/renesas/rz-du/Kconfig"
 source "drivers/gpu/drm/renesas/shmobile/Kconfig"

drivers/gpu/drm/renesas/Makefile

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-y += rcar-du/
+obj-y += rz-du/
 obj-$(CONFIG_DRM_SHMOBILE) += shmobile/

drivers/gpu/drm/renesas/rz-du/Kconfig

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+config DRM_RZG2L_DU
+	tristate "DRM Support for RZ/G2L Display Unit"
+	depends on ARCH_RZG2L || COMPILE_TEST
+	depends on DRM && OF
+	depends on VIDEO_RENESAS_VSP1
+	select DRM_GEM_DMA_HELPER
+	select DRM_KMS_HELPER
+	select VIDEOMODE_HELPERS
+	help
+	  Choose this option if you have an RZ/G2L alike chipset.
+	  If M is selected the module will be called rzg2l-du-drm.

drivers/gpu/drm/renesas/rz-du/Makefile

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+rzg2l-du-drm-y := rzg2l_du_crtc.o \
+		  rzg2l_du_drv.o \
+		  rzg2l_du_encoder.o \
+		  rzg2l_du_kms.o \
+
+rzg2l-du-drm-$(CONFIG_VIDEO_RENESAS_VSP1)	+= rzg2l_du_vsp.o
+obj-$(CONFIG_DRM_RZG2L_DU)		+= rzg2l-du-drm.o