Add DT binding documentation for Sierra PHY IP used in TI's J721E
SoC.

Signed-off-by: Kishon Vijay Abraham I <kis...@ti.com>
---
 .../devicetree/bindings/phy/phy-cadence-sierra.txt  | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/phy-cadence-sierra.txt 
b/Documentation/devicetree/bindings/phy/phy-cadence-sierra.txt
index 6e1b47bfce43..bf90ef7e005e 100644
--- a/Documentation/devicetree/bindings/phy/phy-cadence-sierra.txt
+++ b/Documentation/devicetree/bindings/phy/phy-cadence-sierra.txt
@@ -2,21 +2,24 @@ Cadence Sierra PHY
 -----------------------
 
 Required properties:
-- compatible:  cdns,sierra-phy-t0
-- clocks:      Must contain an entry in clock-names.
-               See ../clocks/clock-bindings.txt for details.
-- clock-names: Must be "phy_clk"
+- compatible:  Must be "cdns,sierra-phy-t0" for Sierra in Cadence platform
+               Must be "ti,sierra-phy-t0" for Sierra in TI's J721E SoC.
 - resets:      Must contain an entry for each in reset-names.
                See ../reset/reset.txt for details.
 - reset-names: Must include "sierra_reset" and "sierra_apb".
                "sierra_reset" must control the reset line to the PHY.
                "sierra_apb" must control the reset line to the APB PHY
-               interface.
+               interface ("sierra_apb" is optional).
 - reg:         register range for the PHY.
 - #address-cells: Must be 1
 - #size-cells: Must be 0
 
 Optional properties:
+- clocks:              Must contain an entry in clock-names.
+                       See ../clocks/clock-bindings.txt for details.
+- clock-names:         Must be "phy_clk". Must contain "cmn_refclk" and
+                       "cmn_refclk1" for configuring the frequency of the
+                       clock to the lanes.
 - cdns,autoconf:       A boolean property whose presence indicates that the
                        PHY registers will be configured by hardware. If not
                        present, all sub-node optional properties must be
-- 
2.17.1

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