Add APM X-Gene clock binding documentation for PMD clock.

Signed-off-by: Hoan Tran <redacted>
---
 Documentation/devicetree/bindings/clock/xgene.txt | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/xgene.txt b/Documentation/devicetree/bindings/clock/xgene.txt
index 82f9638..c381733 100644
--- a/Documentation/devicetree/bindings/clock/xgene.txt
+++ b/Documentation/devicetree/bindings/clock/xgene.txt

@@ -8,6 +8,7 @@ Required properties:
 - compatible : shall be one of the following:
 	"apm,xgene-socpll-clock" - for a X-Gene SoC PLL clock
 	"apm,xgene-pcppll-clock" - for a X-Gene PCP PLL clock
+	"apm,xgene-pmd-clock" - for a X-Gene PMD clock
 	"apm,xgene-device-clock" - for a X-Gene device clock
 	"apm,xgene-socpll-v2-clock" - for a X-Gene SoC PLL v2 clock
 	"apm,xgene-pcppll-v2-clock" - for a X-Gene PCP PLL v2 clock

@@ -22,6 +23,17 @@ Required properties for SoC or PCP PLL clocks:
 Optional properties for PLL clocks:
 - clock-names : shall be the name of the PLL. If missing, use the device name.
 
+Required properties for PMD clocks:
+- reg : shall be the physical register address for the pmd clock.
+- clocks : shall be the input parent clock phandle for the clock.
+- #clock-cells : shall be set to 1.
+- clock-output-names : shall be the name of the clock referenced by derive
+  clock.
+- clock-shift: Bit shift of the clock register. Default is 0.
+- clock-width: Width of the clock register. Default is 32.
+Optional properties for PLL clocks:
+- clock-names : shall be the name of the clock. If missing, use the device name.
+
 Required properties for device clocks:
 - reg : shall be a list of address and length pairs describing the CSR
          reset and/or the divider. Either may be omitted, but at least

@@ -59,6 +71,16 @@ For example:
 		type = <0>;
 	};
 
+	pmd0clk: pmd0clk {
+		compatible = "apm,xgene-pmd-clock";
+		#clock-cells = <1>;
+		clocks = <&pmdpll 0>;
+		reg = <0x0 0x7E200200 0x0 0x10>;
+		clock-shift = <8>;
+		clock-width = <3>;