dt-bindings: mmc: mtk-sd: add Inline Crypto Engine clock

Add optional crypto clock of the Inline Crypto Engine of Mediatek SoCs.
Signed-off-by: Mengqi Zhang <mengqi.zhang@mediatek.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20221106033924.9854-3-mengqi.zhang@mediatek.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/mtk-sd.yaml

@@ -263,6 +263,28 @@ allOf:
             - const: bus_clk
             - const: sys_cg
 
+  - if:
+      properties:
+        compatible:
+          enum:
+            - mediatek,mt8186-mmc
+            - mediatek,mt8188-mmc
+            - mediatek,mt8195-mmc
+    then:
+      properties:
+        clocks:
+          items:
+            - description: source clock
+            - description: HCLK which used for host
+            - description: independent source clock gate
+            - description: crypto clock used for data encrypt/decrypt (optional)
+        clock-names:
+          items:
+            - const: source
+            - const: hclk
+            - const: source_cg
+            - const: crypto
+
   - if:
       properties:
         compatible: