dt-bindings: mfd: mt8195: Add bindings for MediaTek SCPSYS

The System Control Processor System (SCPSYS) has several power
management related tasks in the system. Add the bindings for it.
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220811025813.21492-7-tinghan.shen@mediatek.com

Documentation/devicetree/bindings/mfd/mediatek,mt8195-scpsys.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/mediatek,mt8195-scpsys.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek System Control Processor System
+
+maintainers:
+  - MandyJH Liu <mandyjh.liu@mediatek.com>
+
+description:
+  MediaTek System Control Processor System (SCPSYS) has several
+  power management tasks. The tasks include MTCMOS power
+  domain control, thermal measurement, DVFS, etc.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - mediatek,mt8167-scpsys
+          - mediatek,mt8173-scpsys
+          - mediatek,mt8183-scpsys
+          - mediatek,mt8192-scpsys
+          - mediatek,mt8195-scpsys
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  power-controller:
+    $ref: /schemas/power/mediatek,power-controller.yaml#
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mt8195-clk.h>
+    #include <dt-bindings/power/mt8195-power.h>
+
+    syscon@10006000 {
+      compatible = "mediatek,mt8195-scpsys", "syscon", "simple-mfd";
+      reg = <0x10006000 0x100>;
+
+      spm: power-controller {
+        compatible = "mediatek,mt8195-power-controller";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        #power-domain-cells = <1>;
+
+        /* sample of power domain nodes */
+        power-domain@MT8195_POWER_DOMAIN_PCIE_PHY {
+          reg = <MT8195_POWER_DOMAIN_PCIE_PHY>;
+          #power-domain-cells = <0>;
+        };
+
+        power-domain@MT8195_POWER_DOMAIN_SSUSB_PCIE_PHY {
+          reg = <MT8195_POWER_DOMAIN_SSUSB_PCIE_PHY>;
+          #power-domain-cells = <0>;
+        };
+      };
+    };

Documentation/devicetree/bindings/power/mediatek,power-controller.yaml

@@ -232,7 +232,7 @@ examples:
         #size-cells = <2>;
 
         scpsys: syscon@10006000 {
-            compatible = "syscon", "simple-mfd";
+            compatible = "mediatek,mt8173-scpsys", "syscon", "simple-mfd";
             reg = <0 0x10006000 0 0x1000>;
 
             spm: power-controller {