[PATCH v2 2/2] dt-bindings: phy: Add documentation for Mediatek PCIe PHY

[Ryder Lee]

Add documentation for PCIe PHY available in MT7623 series SoCs.

Signed-off-by: Ryder Lee <ryder.lee at mediatek.com>
Acked-by: Rob Herring <robh at kernel.org>
---
 .../devicetree/bindings/phy/phy-mt7623-pcie.txt    | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/phy-mt7623-pcie.txt

diff --git a/Documentation/devicetree/bindings/phy/phy-mt7623-pcie.txt b/Documentation/devicetree/bindings/phy/phy-mt7623-pcie.txt
new file mode 100644
index 0000000..6fefac5
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-mt7623-pcie.txt
@@ -0,0 +1,63 @@
+Mediatek MT7623 PCIe PHY
+-----------------------
+
+Required properties:
+ - compatible: Should contain "mediatek,mt7623-pcie-phy".
+ - reg: Base address and length of the registers.
+ - clocks: Must contain an entry in clock-names.
+   See ../clocks/clock-bindings.txt for details.
+ - clock-names: Must be "pciephya_ref"
+ - #phy-cells: Must be 0.
+
+Optional properties:
+ - mediatek,phy-switch: A phandle to the system controller, used to
+   switch the PHY on PCIe port2 which is shared with USB u3phy2.
+
+Example:
+
+	pcie0_phy: pcie-phy at 1a149000 {
+		compatible = "mediatek,mt7623-pcie-phy";
+		reg = <0 0x1a149000 0 0x1000>;
+		clocks = <&clk26m>;
+		clock-names = "pciephya_ref";
+		#phy-cells = <0>;
+	};
+
+	pcie1_phy: pcie-phy at 1a14a000 {
+		compatible = "mediatek,mt7623-pcie-phy";
+		reg = <0 0x1a14a000 0 0x1000>;
+		clocks = <&clk26m>;
+		clock-names = "pciephya_ref";
+		#phy-cells = <0>;
+	};
+
+	pcie2_phy: pcie-phy at 1a244000 {
+		compatible = "mediatek,mt7623-pcie-phy";
+		reg = <0 0x1a244000 0 0x1000>;
+		clocks = <&clk26m>;
+		clock-names = "pciephya_ref";
+		#phy-cells = <0>;
+
+		mediatek,phy-switch = <&hifsys>;
+	};
+
+Specifying phy control of devices
+---------------------------------
+
+Device nodes should specify the configuration required in their "phys"
+property, containing a phandle to the phy node and phy-names.
+
+Example:
+
+#include <dt-bindings/phy/phy.h>
+
+pcie: pcie at 1a140000 {
+	...
+	pcie at 0,0 {
+		...
+		phys = <&pcie0_phy>;
+		phy-names = "pcie-phy0";
+	}
+	...
+};
+
-- 
1.9.1