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+* APM X-Gene 15Gbps Multi-purpose PHY nodes
+
+PHY nodes are defined to describe on-chip 15Gbps Multi-purpose PHY. Each
+PHY (pair of lanes) has its own node.
+
+Required properties:
+- compatible : Shall be "apm,xgene-phy" or
+ "apm,xgene-phy-ext". The "apm,xgene-phy" describes
+ an PHY with internal reference PLL located within
+ the IP. The "apm,xgene-phy-ext" describes an PHY
+ where the internal reference PLL located outside of
+ the IP.
+- reg : First PHY memory resource is the SDS PHY access
+ resource.
+ Second PHY memory resource is the SDS PHY access
+ resource outside of the IP if it is type
+ "apm,xgene-phy-ext".
+- #phy-cells : Shall be 1 as it expects one argument for setting
+ the mode of the PHY. Possible values are 0 (SATA),
+ 1 (SGMII), 2 (PCIe), 3 (USB), and 4 (XFI).
+
+Optional properties:
+- status : Shall be "ok" if enabled or "disabled" if disabled.
+ Default is "ok".
+- apm,tx-eye-tuning : Manual control to fine tune the capture of the serial
+ bit lines from the automatic calibrated position.
+ Two set of 3-tuple setting for each (up to 3)
+ supported link speed on the host. Range from 0 to
+ 127 in unit of one bit period. Default is 10.
+- apm,tx-eye-direction : Eye tuning manual control direction. 0 means sample
+ data earlier than the nominal sampling point. 1 means
+ sample data later than the nominal sampling point.
+ Two set of 3-tuple setting for each (up to 3)
+ supported link speed on the host. Default is 0.
+- apm,tx-boost-gain : Frequency boost AC (LSB 3-bit) and DC (2-bit)
+ gain control. Two set of 3-tuple setting for each
+ (up to 3) supported link speed on the host. Range is
+ between 0 to 31 in unit of dB. Default is 3.
+- apm,tx-amplitude : Amplitude control. Two set of 3-tuple setting for
+ each (up to 3) supported link speed on the host.
+ Range is between 0 to 199500 in unit of uV.
+ Default is 199500 uV.
+- apm,tx-pre-cursor1 : 1st pre-cursor emphasis taps control. Two set of
+ 3-tuple setting for each (up to 3) supported link
+ speed on the host. Range is 0 to 273000 in unit of
+ uV. Default is 0.
+- apm,tx-pre-cursor2 : 2st pre-cursor emphasis taps control. Two set of
+ 3-tuple setting for each (up to 3) supported link
+ speed on the host. Range is 0 to 127400 in unit uV.
+ Default is 0x0.
+- apm,tx-post-cursor : Post-cursor emphasis taps control. Two set of
+ 3-tuple setting for Gen1, Gen2, and Gen3. Range is
+ between 0 to 0x1f in unit of 18.2mV. Default is 0xf.
+- apm,tx-speed : Tx operating speed. One set of 3-tuple for each
+ supported link speed on the host.
+ 0 = 1-2Gbps
+ 1 = 2-4Gbps (1st tuple default)
+ 2 = 4-8Gbps
+ 3 = 8-15Gbps (2nd tuple default)
+ 4 = 2.5-4Gbps
+ 5 = 4-5Gbps
+ 6 = 5-6Gbps
+ 7 = 6-16Gbps (3rd tuple default)
+
+NOTE: PHY override parameters are board specific setting.
+
+Example:
+ phy1: phy@1f21a000 {
+ compatible = "apm,xgene-phy";
+ reg = <0x0 0x1f21a000 0x0 0x100>;
+ #phy-cells = <1>;
+ status = "disabled";
+ apm,tx-boost-gain = <2 2 2 2 2 2>;
+ apm,tx-eye-tuning = <10 10 10 10 10 10>;
+ };
+
+ phy2: phy@1f22a000 {
+ compatible = "apm,xgene-phy";
+ reg = <0x0 0x1f22a000 0x0 0x100>;
+ #phy-cells = <1>;
+ status = "ok";
+ apm,tx-boost-gain = <2 2 2 2 2 2>;
+ apm,tx-eye-tuning = <10 10 10 5 5 5>;
+ };
+
+ phy3: phy@1f23a000 {
+ compatible = "apm,xgene-phy-ext";
+ reg = <0x0 0x1f23a000 0x0 0x100>,
+ <0x0 0x1f2d0000 0x0 0x100>;
+ #phy-cells = <1>;
+ status = "ok";
+ apm,tx-boost-gain = <3 3 3 3 3 3>;
+ apm,tx-eye-tuning = <10 10 10 12 12 12>;
+ };