[PATCH v2 4/6] dt: bindings: add mt7621-pll dt binding documentation

[Chuanhong Guo <gch981213@gmail.com>]

This commit adds device tree binding documentation for MT7621
PLL controller.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
---

Change since v1:
drop useless syscon in compatible string

 .../bindings/clock/mediatek,mt7621-pll.txt     | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/mediatek,mt7621-pll.txt

diff --git a/Documentation/devicetree/bindings/clock/mediatek,mt7621-pll.txt b/Documentation/devicetree/bindings/clock/mediatek,mt7621-pll.txt
new file mode 100644
index 000000000000..7dcfbd5283e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/mediatek,mt7621-pll.txt
@@ -0,0 +1,18 @@
+Binding for Mediatek MT7621 PLL controller
+
+The PLL controller provides the 2 main clocks of the SoC: CPU and BUS.
+
+Required Properties:
+- compatible: has to be "mediatek,mt7621-pll"
+- #clock-cells: has to be one
+
+Optional properties:
+- clock-output-names: should be "cpu", "bus"
+
+Example:
+	pll {
+		compatible = "mediatek,mt7621-pll";
+
+		#clock-cells = <1>;
+		clock-output-names = "cpu", "bus";
+	};
-- 
2.21.0