dt-bindings: crypto: fsl-imx-sahara: Document the clocks

Describe the clocks (ipg and ahb) needed by Sahara block to operate.

Signed-off-by: Fabio Estevam <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

Documentation/devicetree/bindings/crypto/fsl-imx-sahara.yaml

···
   interrupts:
     maxItems: 1
 
+  clocks:
+    items:
+      - description: Sahara IPG clock
+      - description: Sahara AHB clock
+
+  clock-names:
+    items:
+      - const: ipg
+      - const: ahb
+
 required:
   - compatible
   - reg
   - interrupts
+  - clocks
+  - clock-names
 
 additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/clock/imx27-clock.h>
+
     crypto@10025000 {
         compatible = "fsl,imx27-sahara";
         reg = <0x10025000 0x800>;
         interrupts = <75>;
+        clocks = <&clks IMX27_CLK_SAHARA_IPG_GATE>,
+                 <&clks IMX27_CLK_SAHARA_AHB_GATE>;
+        clock-names = "ipg", "ahb";
     };