Add bindings to describe Mediatek MT7621 PCIe PHY.

Signed-off-by: Sergio Paracuellos <sergio.paracuel...@gmail.com>
---
 .../bindings/phy/mediatek,mt7621-pci-phy.txt  | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt 
b/Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt
new file mode 100644
index 000000000000..a369d715378b
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/mediatek,mt7621-pci-phy.txt
@@ -0,0 +1,28 @@
+Mediatek Mt7621 PCIe PHY
+
+Required properties:
+- compatible: must be "mediatek,mt7621-pci-phy"
+- reg: base address and length of the PCIe PHY block
+- #phy-cells: must be <1> for pcie0_phy and for pcie1_phy.
+
+Example:
+       pcie0_phy: pcie-phy@1e149000 {
+               compatible = "mediatek,mt7621-pci-phy";
+               reg = <0x1e149000 0x0700>;
+               #phy-cells = <1>;
+       };
+
+       pcie1_phy: pcie-phy@1e14a000 {
+               compatible = "mediatek,mt7621-pci-phy";
+               reg = <0x1e14a000 0x0700>;
+               #phy-cells = <1>;
+       };
+
+       /* users of the PCIe phy */
+
+       pcie: pcie@1e140000 {
+               ...
+               ...
+               phys = <&pcie0_phy 0>, <&pcie0_phy 1>, <&pcie1_phy 0>;
+               phy-names = "pcie-phy0", "pcie-phy1", "pcie-phy2";
+       };
-- 
2.19.1

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