arm64: dts: mediatek: mt8195: Add base display controller graph

The display related IPs in MT8195 are flexible and support being
interconnected with different instances of DDP IPs and/or with
different DDP IPs, forming a full Display Data Path that ends
with an actual display output, which is board specific.

Add a common graph in the main mt8195.dtsi devicetree, which is
shared between all of the currently supported boards.
All boards featuring any display functionality will extend this
common graph to hook the display controller of the SoC to their
specific output port(s).

Link: https://lore.kernel.org/r/20250213112008.56394-2-angelogioacchino.delregno@collabora.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
index f013dbad9dc4..4f2dc0a75566 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
@@ -3142,6 +3142,23 @@
 			clocks = <&vdosys0 CLK_VDO0_DISP_OVL0>;
 			iommus = <&iommu_vdo M4U_PORT_L0_DISP_OVL0_RDMA0>;
 			mediatek,gce-client-reg = <&gce0 SUBSYS_1c00XXXX 0x0000 0x1000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					ovl0_in: endpoint { };
+				};
+
+				port@1 {
+					reg = <1>;
+					ovl0_out: endpoint {
+						remote-endpoint = <&rdma0_in>;
+					};
+				};
+			};
 		};
 
 		rdma0: rdma@1c002000 {
@@ -3152,6 +3169,25 @@
 			clocks = <&vdosys0 CLK_VDO0_DISP_RDMA0>;
 			iommus = <&iommu_vdo M4U_PORT_L0_DISP_RDMA0>;
 			mediatek,gce-client-reg = <&gce0 SUBSYS_1c00XXXX 0x2000 0x1000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					rdma0_in: endpoint {
+						remote-endpoint = <&ovl0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					rdma0_out: endpoint {
+						remote-endpoint = <&color0_in>;
+					};
+				};
+			};
 		};
 
 		color0: color@1c003000 {
@@ -3161,6 +3197,25 @@
 			power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS0>;
 			clocks = <&vdosys0 CLK_VDO0_DISP_COLOR0>;
 			mediatek,gce-client-reg = <&gce0 SUBSYS_1c00XXXX 0x3000 0x1000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					color0_in: endpoint {
+						remote-endpoint = <&rdma0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					color0_out: endpoint {
+						remote-endpoint = <&ccorr0_in>;
+					};
+				};
+			};
 		};
 
 		ccorr0: ccorr@1c004000 {
@@ -3170,6 +3225,25 @@
 			power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS0>;
 			clocks = <&vdosys0 CLK_VDO0_DISP_CCORR0>;
 			mediatek,gce-client-reg = <&gce0 SUBSYS_1c00XXXX 0x4000 0x1000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					ccorr0_in: endpoint {
+						remote-endpoint = <&color0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					ccorr0_out: endpoint {
+						remote-endpoint = <&aal0_in>;
+					};
+				};
+			};
 		};
 
 		aal0: aal@1c005000 {
@@ -3179,6 +3253,25 @@
 			power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS0>;
 			clocks = <&vdosys0 CLK_VDO0_DISP_AAL0>;
 			mediatek,gce-client-reg = <&gce0 SUBSYS_1c00XXXX 0x5000 0x1000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					aal0_in: endpoint {
+						remote-endpoint = <&ccorr0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					aal0_out: endpoint {
+						remote-endpoint = <&gamma0_in>;
+					};
+				};
+			};
 		};
 
 		gamma0: gamma@1c006000 {
@@ -3188,6 +3281,25 @@
 			power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS0>;
 			clocks = <&vdosys0 CLK_VDO0_DISP_GAMMA0>;
 			mediatek,gce-client-reg = <&gce0 SUBSYS_1c00XXXX 0x6000 0x1000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					gamma0_in: endpoint {
+						remote-endpoint = <&aal0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					gamma0_out: endpoint {
+						remote-endpoint = <&dither0_in>;
+					};
+				};
+			};
 		};
 
 		dither0: dither@1c007000 {
@@ -3197,6 +3309,23 @@
 			power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS0>;
 			clocks = <&vdosys0 CLK_VDO0_DISP_DITHER0>;
 			mediatek,gce-client-reg = <&gce0 SUBSYS_1c00XXXX 0x7000 0x1000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					dither0_in: endpoint {
+						remote-endpoint = <&gamma0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					dither0_out: endpoint { };
+				};
+			};
 		};
 
 		dsi0: dsi@1c008000 {