dt-bindings: clock: axi-clkgen: include AXI clk

In order to access the registers of the HW, we need to make sure that
the AXI bus clock is enabled. Hence let's increase the number of clocks
by one and add clock-names to differentiate between parent clocks and
the bus clock.

Fixes: 0e646c5 ("clk: Add axi-clkgen driver")
Signed-off-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Conor Dooley <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: nunojsa

Documentation/devicetree/bindings/clock/adi,axi-clkgen.yaml

@@ -26,9 +26,21 @@ properties:
     description:
       Specifies the reference clock(s) from which the output frequency is
       derived. This must either reference one clock if only the first clock
-      input is connected or two if both clock inputs are connected.
-    minItems: 1
-    maxItems: 2
+      input is connected or two if both clock inputs are connected. The last
+      clock is the AXI bus clock that needs to be enabled so we can access the
+      core registers.
+    minItems: 2
+    maxItems: 3
+
+  clock-names:
+    oneOf:
+      - items:
+          - const: clkin1
+          - const: s_axi_aclk
+      - items:
+          - const: clkin1
+          - const: clkin2
+          - const: s_axi_aclk
 
   '#clock-cells':
     const: 0
@@ -40,6 +52,7 @@ required:
   - compatible
   - reg
   - clocks
+  - clock-names
   - '#clock-cells'
 
 additionalProperties: false
@@ -50,5 +63,6 @@ examples:
       compatible = "adi,axi-clkgen-2.00.a";
       #clock-cells = <0>;
       reg = <0xff000000 0x1000>;
-      clocks = <&osc 1>;
+      clocks = <&osc 1>, <&clkc 15>;
+      clock-names = "clkin1", "s_axi_aclk";
     };