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

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Date:   Sun, 23 Apr 2017 16:17:33 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Ryder Lee <ryder.lee@...iatek.com>
Subject: [PATCH 2/2] dt-bindings: phy: Add documentation for Mediatek PCIe PHY

Add documentation for PCIe PHY available in MT7623 series SoCs.

Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
---
 .../devicetree/bindings/phy/phy-mt7623-pcie.txt    | 67 ++++++++++++++++++++++
 1 file changed, 67 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..27a9253
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-mt7623-pcie.txt
@@ -0,0 +1,67 @@
+Mediatek MT7623 PCIe PHY
+-----------------------
+
+Required properties:
+ - compatible: Should contain "mediatek,mt7623-pcie-phy"
+ - #phy-cells: must be 0
+ - clocks: Must contain an entry in clock-names.
+	See ../clocks/clock-bindings.txt for details.
+ - clock-names: Must be "refclk"
+ - resets: Must contain an entry in reset-names.
+	See ../reset/reset.txt for details.
+ - reset-names: Must be "phy"
+
+Optional properties:
+ - phy-switch: The PHY on PCIe port2 is shared with USB u3phy2. If you
+	want to enable port2, you should contain it.
+
+Example:
+
+	pcie0_phy: pciephy@...49000 {
+		compatible = "mediatek,mt7623-pcie-phy";
+		reg = <0 0x1a149000 0 0x1000>;
+		clocks = <&clk26m>;
+		clock-names = "pciephya_ref";
+		#phy-cells = <0>;
+		status = "disabled";
+	};
+
+	pcie1_phy: pciephy@...4a000 {
+		compatible = "mediatek,mt7623-pcie-phy";
+		reg = <0 0x1a14a000 0 0x1000>;
+		clocks = <&clk26m>;
+		clock-names = "pciephya_ref";
+		#phy-cells = <0>;
+		status = "disabled";
+	};
+
+	pcie2_phy: pciephy@...44000 {
+		compatible = "mediatek,mt7623-pcie-phy";
+		reg = <0 0x1a244000 0 0x1000>;
+		clocks = <&clk26m>;
+		clock-names = "pciephya_ref";
+		#phy-cells = <0>;
+
+		phy-switch = <&hifsys>;
+		status = "disabled";
+	};
+
+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@...40000 {
+	...
+	pcie@1,0 {
+		...
+		phys = <&pcie0_phy>;
+		phy-names = "pcie-phy0";
+	}
+	...
+};
-- 
1.9.1