dt-bindings: clock: xilinx: describe whether dynamic reconfig is enabled

Xilinx clocking wizard IP core's dynamic reconfiguration support is
optionally enabled at build time. Add a devicetree boolean property to
describe whether the hardware supports this feature or not.

Since dynamic reconfiguration support was previously assumed enabled,
introduce a property to indicate the inverse, in order to maintain
devicetree backwards compatibility. Hence, this new xlnx,static-config
property should be specified when dynamic reconfiguration support is
disabled in the IP core configuration.

Signed-off-by: Harry Austen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: Harry Austen

Documentation/devicetree/bindings/clock/xlnx,clocking-wizard.yaml

@@ -39,6 +39,11 @@ properties:
       - const: clk_in1
       - const: s_axi_aclk
 
+  xlnx,static-config:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Indicate whether the core has been configured without support for dynamic
+      runtime reconfguration of the clocking primitive MMCM/PLL.
 
   xlnx,speed-grade:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -70,6 +75,7 @@ examples:
         compatible = "xlnx,clocking-wizard";
         reg = <0xb0000000 0x10000>;
         #clock-cells = <1>;
+        xlnx,static-config;
         xlnx,speed-grade = <1>;
         xlnx,nr-outputs = <6>;
         clock-names = "clk_in1", "s_axi_aclk";