dt-bindings: Add Cygnus PCIe PHY binding doc

Add DT binding document for Broadcom Cygnus PCIe PHYs

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Arun Parameswaran <aparames@broadcom.com>
Reviewed-by: JD (Jiandong) Zheng <jdzheng@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/Documentation/devicetree/bindings/phy/brcm,cygnus-pcie-phy.txt b/Documentation/devicetree/bindings/phy/brcm,cygnus-pcie-phy.txt
new file mode 100644 (file)
index 0000000..761c4bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/brcm,cygnus-pcie-phy.txt
@@ -0,0 +1,47 @@
+Broadcom Cygnus PCIe PHY
+
+Required properties:
+- compatible: must be "brcm,cygnus-pcie-phy"
+- reg: base address and length of the PCIe PHY block
+- #address-cells: must be 1
+- #size-cells: must be 0
+
+Each PCIe PHY should be represented by a child node
+
+Required properties For the child node:
+- reg: the PHY ID
+0 - PCIe RC 0
+1 - PCIe RC 1
+- #phy-cells: must be 0
+
+Example:
+       pcie_phy: phy@0301d0a0 {
+               compatible = "brcm,cygnus-pcie-phy";
+               reg = <0x0301d0a0 0x14>;
+
+               pcie0_phy: phy@0 {
+                       reg = <0>;
+                       #phy-cells = <0>;
+               };
+
+               pcie1_phy: phy@1 {
+                       reg = <1>;
+                       #phy-cells = <0>;
+               };
+       };
+
+       /* users of the PCIe phy */
+
+       pcie0: pcie@18012000 {
+               ...
+               ...
+               phys = <&pcie0_phy>;
+               phy-names = "pcie-phy";
+       };
+
+       pcie1: pcie@18013000 {
+               ...
+               ...
+               phys = <pcie1_phy>;
+               phy-names = "pcie-phy";
+       };