[PATCH v7 2/4] Documentation: Add APM X-Gene SoC 15Gbps Multi-purpose PHY driver binding documentation

Signed-off-by: Loc Ho <redacted>
Signed-off-by: Tuan Phan <redacted>
Signed-off-by: Suman Tripathi <redacted>
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 .../devicetree/bindings/phy/apm-xgene-phy.txt      |   94 ++++++++++++++++++++
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diff --git a/Documentation/devicetree/bindings/phy/apm-xgene-phy.txt b/Documentation/devicetree/bindings/phy/apm-xgene-phy.txt
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+* APM X-Gene 15Gbps Multi-purpose PHY nodes
+
+PHY nodes are defined to describe on-chip 15Gbps Multi-purpose PHY. Each
+PHY (pair of lanes) has its own node.
+
+Required properties:
+- compatible		: Shall be "apm,xgene-phy" or
+			  "apm,xgene-phy-ext". The "apm,xgene-phy" describes
+			  an PHY with internal reference PLL located within
+			  the IP. The "apm,xgene-phy-ext" describes an PHY
+			  where the internal reference PLL located outside of
+			  the IP.