dt-bindings: mmc: sdhci-of-dwcmhsc: Add rockchip support

This patch adds rockchip support in sdhci-of-dwcmhsc.yaml
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Link: https://lore.kernel.org/r/1615879102-45919-2-git-send-email-shawn.lin@rock-chips.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml

@@ -16,6 +16,7 @@ allOf:
 properties:
   compatible:
     enum:
+      - rockchip,rk3568-dwcmshc
       - snps,dwcmshc-sdhci
 
   reg:
@@ -31,12 +32,24 @@ properties:
     items:
       - description: core clock
       - description: bus clock for optional
+      - description: axi clock for rockchip specified
+      - description: block clock for rockchip specified
+      - description: timer clock for rockchip specified
+
 
   clock-names:
     minItems: 1
     items:
       - const: core
       - const: bus
+      - const: axi
+      - const: block
+      - const: timer
+
+  rockchip,txclk-tapnum:
+    description: Specify the number of delay for tx sampling.
+    $ref: /schemas/types.yaml#/definitions/uint8
+
 
 required:
   - compatible
@@ -48,6 +61,17 @@ required:
 unevaluatedProperties: false
 
 examples:
+  - |
+    mmc@fe310000 {
+      compatible = "rockchip,rk3568-dwcmshc";
+      reg = <0xfe310000 0x10000>;
+      interrupts = <0 25 0x4>;
+      clocks = <&cru 17>, <&cru 18>, <&cru 19>, <&cru 20>, <&cru 21>;
+      clock-names = "core", "bus", "axi", "block", "timer";
+      bus-width = <8>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+    };
   - |
     mmc@aa0000 {
       compatible = "snps,dwcmshc-sdhci";