linux-kernel - [PATCH v2 2/3] phy: zynqmp: Add dt bindings for ZynqMP PHY.

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Message-ID: <1452694404-1253-1-git-send-email-sbhatta@xilinx.com>
Date:	Wed, 13 Jan 2016 19:43:24 +0530
From:	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>
To:	<kishon@...com>, <robh@...nel.org>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"Subbaraya Sundeep Bhatta" <sbhatta@...inx.com>
Subject: [PATCH v2 2/3] phy: zynqmp: Add dt bindings for ZynqMP PHY.

This patch adds the document describing dt bindings for ZynqMP
PHY. ZynqMP SOC has a High Speed Processing System Gigabit
Transceiver which provides PHY capabilties to USB, SATA,
PCIE, Display Port and Ehernet SGMII controllers.

Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
---
 v2:
	modified to use phy cells as 2.

 .../devicetree/bindings/phy/phy-zynqmp.txt         | 103 +++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/phy-zynqmp.txt

diff --git a/Documentation/devicetree/bindings/phy/phy-zynqmp.txt b/Documentation/devicetree/bindings/phy/phy-zynqmp.txt
new file mode 100644
index 0000000..975cf21
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-zynqmp.txt
@@ -0,0 +1,103 @@
+Xilinx ZynqMP PHY binding
+
+This binding describes a ZynqMP PHY device that is used to control ZynqMP
+High Speed Gigabit Transceiver(GT). ZynqMP PS GTR provides four lanes
+and are used by USB, SATA, PCIE, Display port and Ethernet SGMMI controllers.
+
+Required properties (controller (parent) node):
+- compatible    : Should be "xlnx,zynqmp-psgtr"
+
+- reg		: Address and length of register sets for each device in
+		  "reg-names"
+- reg-names     : The names of the register addresses corresponding to the
+		  registers filled in "reg":
+			- serdes: SERDES block register set
+			- siou: SIOU block register set
+			- lpd: Low power domain peripherals reset control
+			- fpd: Full power domain peripherals reset control
+
+-xlnx,tx_termination_fix: Include fix for a functional issue in the GT. The TX
+			  termination resistance can be out of spec due to a
+			  bug in the calibration logic. This issue will be fixed
+			  in silicon in future versions.
+
+Required nodes	:  A sub-node is required for each lane the controller
+		   provides.
+
+Required properties (port (child) nodes):
+lane0:
+- #phy-cells	: Should be 2
+		  Cell after port phandle is device type from:
+			- <PHY_TYPE_PCIE 0>
+			- <PHY_TYPE_SATA 0>
+			- <PHY_TYPE_USB3 0>
+			- <PHY_TYPE_DP 1>
+			- <PHY_TYPE_SGMII 0>
+lane1:
+- #phy-cells	: Should be 2
+		  Cell after port phandle is device type from:
+			- <PHY_TYPE_PCIE 1>
+			- <PHY_TYPE_SATA 1>
+			- <PHY_TYPE_USB3 0>
+			- <PHY_TYPE_DP 0>
+			- <PHY_TYPE_SGMII 1>
+lane2:
+- #phy-cells	: Should be 2
+		  Cell after port phandle is device type from:
+			- <PHY_TYPE_PCIE 2>
+			- <PHY_TYPE_SATA 0>
+			- <PHY_TYPE_USB3 0>
+			- <PHY_TYPE_DP 1>
+			- <PHY_TYPE_SGMII 2>
+lane3:
+- #phy-cells	: Should be 2
+		  Cell after port phandle is device type from:
+			- <PHY_TYPE_PCIE 3>
+			- <PHY_TYPE_SATA 1>
+			- <PHY_TYPE_USB3 1>
+			- <PHY_TYPE_DP 0>
+			- <PHY_TYPE_SGMII 3>
+
+Example:
+	zynqmp_phy@...00000 {
+		compatible = "xlnx,zynqmp-psgtr";
+		status = "okay";
+		reg = <0x0 0xfd400000 0x40000>, <0x0 0xfd3d0000 0x1000>,
+			<0x0 0xfd1a0000 0x1000>, <0x0 0xff5e0000 0x1000>;
+		reg-names = "serdes", "siou", "fpd", "lpd";
+
+		lane0: lane@0 {
+			#phy-cells = <2>;
+		};
+		lane1: lane@1 {
+			#phy-cells = <2>;
+		};
+		lane2: lane@2 {
+			#phy-cells = <2>;
+		};
+		lane3: lane@3 {
+			#phy-cells = <2>;
+		};
+	};
+
+Specifying phy control of devices
+=================================
+
+Device nodes should specify the configuration required in their "phys"
+property, containing a phandle to the phy port node and a device type.
+
+Example:
+
+#include <dt-bindings/phy/phy.h>
+
+	usb@...00000 {
+		...
+		phys	  = <&lane2 PHY_TYPE_USB3 0>;
+		...
+	};
+
+	ahci@...c0000 {
+		...
+		phys	  = <&lane3 PHY_TYPE_SATA 1>;
+		...
+	};
-- 
2.1.2