dt-bindings: clock: add ipq6018 a53 pll compatible

cpus on ipq6018 are clocked by a53 pll, add device compatible for a53
pll found on ipq6018 devices.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sivaprakash Murugesan <sivaprak@codeaurora.org>
Link: https://lore.kernel.org/r/1592800092-20533-2-git-send-email-sivaprak@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/qcom,a53pll.yaml

@@ -15,7 +15,9 @@ description:
 
 properties:
   compatible:
-    const: qcom,msm8916-a53pll
+    enum:
+      - qcom,ipq6018-a53pll
+      - qcom,msm8916-a53pll
 
   reg:
     maxItems: 1
@@ -23,6 +25,14 @@ properties:
   '#clock-cells':
     const: 0
 
+  clocks:
+    items:
+      - description: board XO clock
+
+  clock-names:
+    items:
+      - const: xo
+
 required:
   - compatible
   - reg
@@ -38,3 +48,12 @@ examples:
         reg = <0xb016000 0x40>;
         #clock-cells = <0>;
     };
+  #Example 2 - A53 PLL found on IPQ6018 devices
+  - |
+    a53pll_ipq: clock-controller@b116000 {
+        compatible = "qcom,ipq6018-a53pll";
+        reg = <0x0b116000 0x40>;
+        #clock-cells = <0>;
+        clocks = <&xo>;
+        clock-names = "xo";
+    };