dt-bindings: display: mediatek: add vdosys1 RDMA definition for mt8195

Add vdosys1 RDMA definition.
Signed-off-by: NNancy.Lin <nancy.lin@mediatek.com>
Reviewed-by: NAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Tested-by: NAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220620091930.27797-2-nancy.lin@mediatek.com/Signed-off-by: NChun-Kuang Hu <chunkuang.hu@kernel.org>

Documentation/devicetree/bindings/display/mediatek/mediatek,mdp-rdma.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/mediatek/mediatek,mdp-rdma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MDP RDMA
+
+maintainers:
+  - Chun-Kuang Hu <chunkuang.hu@kernel.org>
+  - Philipp Zabel <p.zabel@pengutronix.de>
+
+description:
+  The MediaTek MDP RDMA stands for Read Direct Memory Access.
+  It provides real time data to the back-end panel driver, such as DSI,
+  DPI and DP_INTF.
+  It contains one line buffer to store the sufficient pixel data.
+  RDMA device node must be siblings to the central MMSYS_CONFIG node.
+  For a description of the MMSYS_CONFIG binding, see
+  Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml for details.
+
+properties:
+  compatible:
+    const: mediatek,mt8195-vdo1-rdma
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: RDMA Clock
+
+  iommus:
+    maxItems: 1
+
+  mediatek,gce-client-reg:
+    description:
+      The register of display function block to be set by gce. There are 4 arguments,
+      such as gce node, subsys id, offset and register size. The subsys id that is
+      mapping to the register of display function blocks is defined in the gce header
+      include/dt-bindings/gce/<chip>-gce.h of each chips.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      items:
+        - description: phandle of GCE
+        - description: GCE subsys id
+        - description: register offset
+        - description: register size
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - power-domains
+  - clocks
+  - iommus
+  - mediatek,gce-client-reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/mt8195-clk.h>
+    #include <dt-bindings/power/mt8195-power.h>
+    #include <dt-bindings/gce/mt8195-gce.h>
+    #include <dt-bindings/memory/mt8195-memory-port.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        rdma@1c104000 {
+            compatible = "mediatek,mt8195-vdo1-rdma";
+            reg = <0 0x1c104000 0 0x1000>;
+            interrupts = <GIC_SPI 495 IRQ_TYPE_LEVEL_HIGH 0>;
+            clocks = <&vdosys1 CLK_VDO1_MDP_RDMA0>;
+            power-domains = <&spm MT8195_POWER_DOMAIN_VDOSYS1>;
+            iommus = <&iommu_vdo M4U_PORT_L2_MDP_RDMA0>;
+            mediatek,gce-client-reg = <&gce0 SUBSYS_1c10XXXX 0x4000 0x1000>;
+        };
+    };