dt-bindings: clock: mediatek: Add clock driver bindings for MT6795

Add the bindings for the clock drivers of the MediaTek Helio X10
MT6795 SoC.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220921091455.41327-5-angelogioacchino.delregno@collabora.comSigned-off-by: Chen-Yu Tsai <wenst@chromium.org>

Documentation/devicetree/bindings/clock/mediatek,mt6795-clock.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/mediatek,mt6795-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Functional Clock Controller for MT6795
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+  - Chun-Jie Chen <chun-jie.chen@mediatek.com>
+
+description: |
+  The clock architecture in MediaTek like below
+  PLLs -->
+          dividers -->
+                      muxes
+                           -->
+                              clock gate
+
+  The devices provide clock gate control in different IP blocks.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt6795-mfgcfg
+      - mediatek,mt6795-vdecsys
+      - mediatek,mt6795-vencsys
+
+  reg:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mfgcfg: clock-controller@13000000 {
+            compatible = "mediatek,mt6795-mfgcfg";
+            reg = <0 0x13000000 0 0x1000>;
+            #clock-cells = <1>;
+        };
+
+        vdecsys: clock-controller@16000000 {
+            compatible = "mediatek,mt6795-vdecsys";
+            reg = <0 0x16000000 0 0x1000>;
+            #clock-cells = <1>;
+        };
+
+        vencsys: clock-controller@18000000 {
+            compatible = "mediatek,mt6795-vencsys";
+            reg = <0 0x18000000 0 0x1000>;
+            #clock-cells = <1>;
+        };
+    };

Documentation/devicetree/bindings/clock/mediatek,mt6795-sys-clock.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/mediatek,mt6795-sys-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek System Clock Controller for MT6795
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+  - Chun-Jie Chen <chun-jie.chen@mediatek.com>
+
+description:
+  The Mediatek system clock controller provides various clocks and system
+  configuration like reset and bus protection on MT6795.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - mediatek,mt6795-apmixedsys
+          - mediatek,mt6795-infracfg
+          - mediatek,mt6795-pericfg
+          - mediatek,mt6795-topckgen
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 1
+
+  '#reset-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        topckgen: clock-controller@10000000 {
+            compatible = "mediatek,mt6795-topckgen", "syscon";
+            reg = <0 0x10000000 0 0x1000>;
+            #clock-cells = <1>;
+        };
+    };