scsi: dt-bindings: ufs: Document Renesas R-Car UFS host controller

Document Renesas R-Car UFS host controller for R-Car S4-8 (r8a779f0).

Link: https://lore.kernel.org/r/20220603110524.1997825-2-yoshihiro.shimoda.uh@renesas.com
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/Documentation/devicetree/bindings/ufs/renesas,ufs.yaml b/Documentation/devicetree/bindings/ufs/renesas,ufs.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ufs/renesas,ufs.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R-Car UFS Host Controller
+
+maintainers:
+  - Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
+
+allOf:
+  - $ref: ufs-common.yaml
+
+properties:
+  compatible:
+    const: renesas,r8a779f0-ufs
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: fck
+      - const: ref_clk
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - power-domains
+  - resets
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a779f0-cpg-mssr.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/r8a779f0-sysc.h>
+
+    ufs: ufs@e686000 {
+            compatible = "renesas,r8a779f0-ufs";
+            reg = <0xe6860000 0x100>;
+            interrupts = <GIC_SPI 235 IRQ_TYPE_LEVEL_HIGH>;
+            clocks = <&cpg CPG_MOD 1514>, <&ufs30_clk>;
+            clock-names = "fck", "ref_clk";
+            freq-table-hz = <200000000 200000000>, <38400000 38400000>;
+            power-domains = <&sysc R8A779F0_PD_ALWAYS_ON>;
+            resets = <&cpg 1514>;
+    };