dt-bindings: mailbox: Convert mtk-gce to DT schema

Convert the mtk-gce mailbox binding to DT schema format.

During the conversion, the examples for client device/mutex nodes
were removed, as these are found in their respective bindings:
arm/mediatek/mediatek,mmsys.yaml for "mediatek,mt8173-mmsys"
soc/mediatek/mediatek,mutex.yaml for "mediatek,mt8173-disp-mutex"
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220921090006.37642-1-angelogioacchino.delregno@collabora.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml

@@ -52,7 +52,8 @@ properties:
     description:
       Using mailbox to communicate with GCE, it should have this
       property and list of phandle, mailbox specifiers. See
-      Documentation/devicetree/bindings/mailbox/mtk-gce.txt for details.
+      Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
+      for details.
     $ref: /schemas/types.yaml#/definitions/phandle-array
 
   mediatek,gce-client-reg:

Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/mediatek,gce-mailbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek Global Command Engine Mailbox
+
+maintainers:
+  - Houlong Wei <houlong.wei@mediatek.com>
+
+description:
+  The Global Command Engine (GCE) is used to help read/write registers with
+  critical time limitation, such as updating display configuration during the
+  vblank. The GCE can be used to implement the Command Queue (CMDQ) driver.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt6779-gce
+      - mediatek,mt8173-gce
+      - mediatek,mt8183-gce
+      - mediatek,mt8186-gce
+      - mediatek,mt8192-gce
+      - mediatek,mt8195-gce
+
+  "#mbox-cells":
+    const: 2
+    description:
+      The first cell describes the Thread ID of the GCE,
+      the second cell describes the priority of the GCE thread
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Global Command Engine clock
+
+  clock-names:
+    items:
+      - const: gce
+
+required:
+  - compatible
+  - "#mbox-cells"
+  - reg
+  - interrupts
+  - clocks
+
+allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: mediatek,mt8195-gce
+    then:
+      required:
+        - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mt8173-clk.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        gce: mailbox@10212000 {
+            compatible = "mediatek,mt8173-gce";
+            reg = <0 0x10212000 0 0x1000>;
+            interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_LOW>;
+            #mbox-cells = <2>;
+            clocks = <&infracfg CLK_INFRA_GCE>;
+            clock-names = "gce";
+        };
+    };

Documentation/devicetree/bindings/mailbox/mtk-gce.txt

-MediaTek GCE
-===============
-
-The Global Command Engine (GCE) is used to help read/write registers with
-critical time limitation, such as updating display configuration during the
-vblank. The GCE can be used to implement the Command Queue (CMDQ) driver.
-
-CMDQ driver uses mailbox framework for communication. Please refer to
-mailbox.txt for generic information about mailbox device-tree bindings.
-
-Required properties:
-- compatible: can be "mediatek,mt8173-gce", "mediatek,mt8183-gce",
-  "mediatek,mt8186-gce", "mediatek,mt8192-gce", "mediatek,mt8195-gce" or
-  "mediatek,mt6779-gce".
-- reg: Address range of the GCE unit
-- interrupts: The interrupt signal from the GCE block
-- clock: Clocks according to the common clock binding
-- clock-names: Must be "gce" to stand for GCE clock
-- #mbox-cells: Should be 2.
-	<&phandle channel priority>
-	phandle: Label name of a gce node.
-	channel: Channel of mailbox. Be equal to the thread id of GCE.
-	priority: Priority of GCE thread.
-
-Required properties for a client device:
-- mboxes: Client use mailbox to communicate with GCE, it should have this
-  property and list of phandle, mailbox specifiers.
-Optional properties for a client device:
-- mediatek,gce-client-reg: Specify the sub-system id which is corresponding
-  to the register address, it should have this property and list of phandle,
-  sub-system specifiers.
-  <&phandle subsys_number start_offset size>
-  phandle: Label name of a gce node.
-  subsys_number: specify the sub-system id which is corresponding
-                 to the register address.
-  start_offset: the start offset of register address that GCE can access.
-  size: the total size of register address that GCE can access.
-
-Optional properties for a client mutex node:
-- mediatek,gce-events: GCE events used by clients. The event numbers are
-  defined in 'dt-bindings/gce/<chip>-gce.h'.
-
-Some vaules of properties are defined in 'dt-bindings/gce/mt8173-gce.h',
-'dt-bindings/gce/mt8183-gce.h', 'dt-bindings/gce/mt8186-gce.h'
-'dt-bindings/gce/mt8192-gce.h', 'dt-bindings/gce/mt8195-gce.h' or
-'dt-bindings/gce/mt6779-gce.h'.
-Such as sub-system ids, thread priority, event ids.
-
-Example:
-
-	gce: gce@10212000 {
-		compatible = "mediatek,mt8173-gce";
-		reg = <0 0x10212000 0 0x1000>;
-		interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_LOW>;
-		clocks = <&infracfg CLK_INFRA_GCE>;
-		clock-names = "gce";
-		#mbox-cells = <2>;
-	};
-
-Example for a client device:
-
-	mmsys: clock-controller@14000000 {
-		compatible = "mediatek,mt8173-mmsys";
-		mboxes = <&gce 0 CMDQ_THR_PRIO_LOWEST>,
-			 <&gce 1 CMDQ_THR_PRIO_LOWEST>;
-		mutex-event-eof = <CMDQ_EVENT_MUTEX0_STREAM_EOF
-				CMDQ_EVENT_MUTEX1_STREAM_EOF>;
-		mediatek,gce-client-reg = <&gce SUBSYS_1400XXXX 0x3000 0x1000>,
-					  <&gce SUBSYS_1401XXXX 0x2000 0x100>;
-		...
-	};
-
-Example for a client mutex node:
-	mutex: mutex@14020000 {
-		compatible = "mediatek,mt8173-disp-mutex";
-		reg = <0 0x14020000 0 0x1000>;
-		interrupts = <GIC_SPI 169 IRQ_TYPE_LEVEL_LOW>;
-		power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
-		clocks = <&mmsys CLK_MM_MUTEX_32K>;
-		mediatek,gce-events = <CMDQ_EVENT_MUTEX0_STREAM_EOF>,
-				      <CMDQ_EVENT_MUTEX1_STREAM_EOF>;
-	};