dt-bindings: clock: stm32mp1 new compatible for secure rcc

Introduce new compatible string "st,stm32mp1-rcc-secure" for
stm32mp1 clock driver when the device is configured with RCC
security support hardened.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210617051814.12018-11-gabriel.fernandez@foss.st.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/st,stm32mp1-rcc.yaml

@@ -54,7 +54,9 @@ properties:
 
   compatible:
     items:
-      - const: st,stm32mp1-rcc
+      - enum:
+          - st,stm32mp1-rcc-secure
+          - st,stm32mp1-rcc
       - const: syscon
 
   reg:
@@ -71,7 +73,7 @@ additionalProperties: false
 examples:
   - |
     rcc: rcc@50000000 {
-        compatible = "st,stm32mp1-rcc", "syscon";
+        compatible = "st,stm32mp1-rcc-secure", "syscon";
         reg = <0x50000000 0x1000>;
         #clock-cells = <1>;
         #reset-cells = <1>;