media: dt-bindings: media: samsung,exynos5250-gsc: convert to dtschema

Convert the Samsung Exynos SoC G-Scaler bindings to DT schema.

Changes done during conversion:
1. A typical (already used) properties like clocks, iommus and
   power-domains.
2. Require clocks, because they are essential for the block to operate.
3. Describe the differences in clocks between the Exynos5250/5420 and
   the Exynos5433 G-Scalers.  This includes the fifth Exynos5433 clock
   "gsd" (GSCL Smart Deck) which was added to the DTS, but not to the
   bindings and Linux driver.  Similarly to Exynos5433 DECON change [1],
   the clock should be used.

[1] https://lore.kernel.org/all/6270db2d-667d-8d6f-9289-be92da486c25@samsung.com/Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/devicetree/bindings/media/exynos5-gsc.txt

-* Samsung Exynos5 G-Scaler device
-
-G-Scaler is used for scaling and color space conversion on Exynos5 SoCs.
-
-Required properties:
-- compatible: should be one of
-	      "samsung,exynos5250-gsc"
-	      "samsung,exynos5420-gsc"
-	      "samsung,exynos5433-gsc"
-	      "samsung,exynos5-gsc" (deprecated)
-- reg: should contain G-Scaler physical address location and length.
-- interrupts: should contain G-Scaler interrupt number
-
-Optional properties:
-- samsung,sysreg: handle to syscon used to control the system registers to
-  set writeback input and destination
-
-Example:
-
-gsc_0:  gsc@13e00000 {
-	compatible = "samsung,exynos5250-gsc";
-	reg = <0x13e00000 0x1000>;
-	interrupts = <0 85 0>;
-};
-
-Aliases:
-Each G-Scaler node should have a numbered alias in the aliases node,
-in the form of gscN, N = 0...3. G-Scaler driver uses these aliases
-to retrieve the device IDs using "of_alias_get_id()" call.
-
-Example:
-
-aliases {
-	gsc0 =&gsc_0;
-	gsc1 =&gsc_1;
-	gsc2 =&gsc_2;
-	gsc3 =&gsc_3;
-};

Documentation/devicetree/bindings/media/samsung,exynos5250-gsc.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/samsung,exynos5250-gsc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung Exynos SoC G-Scaler
+
+maintainers:
+  - Inki Dae <inki.dae@samsung.com>
+  - Krzysztof Kozlowski <krzk@kernel.org>
+  - Seung-Woo Kim <sw0312.kim@samsung.com
+
+description:
+  G-Scaler is used for scaling and color space conversion on Samsung Exynos
+  SoCs.
+
+  Each G-Scaler node should have a numbered alias in the aliases node, in the
+  form of gscN, N = 0...3.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - samsung,exynos5250-gsc
+              - samsung,exynos5420-gsc
+          - const: samsung,exynos5-gsc
+      - enum:
+          - samsung,exynos5433-gsc
+      - const: samsung,exynos5-gsc
+        deprecated: True
+
+  clocks:
+    minItems: 1
+    maxItems: 5
+
+  clock-names:
+    minItems: 1
+    maxItems: 5
+
+  interrupts:
+    maxItems: 1
+
+  iommus:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  samsung,sysreg:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Syscon used to control the system registers to set writeback input and destination.
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+  - interrupts
+  - reg
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - samsung,exynos5-gsc
+              - samsung,exynos5250-gsc
+              - samsung,exynos5420-gsc
+    then:
+      properties:
+        clocks:
+          maxItems: 1
+        clock-names:
+          items:
+            - const: gscl
+    else:
+      properties:
+        clocks:
+          minItems: 5
+        clock-names:
+          items:
+            - const: pclk
+            - const: aclk
+            - const: aclk_xiu
+            - const: aclk_gsclbend
+            - const: gsd
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/exynos5250.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    video-scaler@13e00000 {
+        compatible = "samsung,exynos5250-gsc", "samsung,exynos5-gsc";
+        reg = <0x13e00000 0x1000>;
+        interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+        power-domains = <&pd_gsc>;
+        clocks = <&clock CLK_GSCL0>;
+        clock-names = "gscl";
+        iommus = <&sysmmu_gsc0>;
+    };