Documentation: Add APM X-Gene SoC 6.0Gbps SATA PHY driver binding documentation
Document the DTS binding for the X-Gene SoC SATA PHY driver.
Signed-off-by: Loc Ho <lho@xxxxxxx>
Signed-off-by: Tuan Phan <tphan@xxxxxxx>
Signed-off-by: Suman Tripathi <stripathi@xxxxxxx>
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.../devicetree/bindings/ata/apm-xgene-phy.txt | 61 ++++++++++++++++++++
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+* APM X-Gene 6.0 Gb/s SATA PHY nodes
+
+SATA PHY nodes are defined to describe on-chip Serial ATA PHY. Each SATA PHY
+(pair of PHY) has its own node.
+
+Required properties:
+- compatible : Shall be "apm,xgene-ahci-phy" or
+ "apm,xgene-ahci-phy2". The "apm,xgene-ahci-phy"
+ describes an port shared with SGMII Ethernet port.
+ The "apm,xgene-ahci-phy2" describes an port not
+ shared with SGMII and the PLL located at another
+ memory resource region.
+- reg : First PHY memory resource
+ Second separate PHY PLL clock memory resource if
+ type "apm,xgene-ahci-phy2"
+- #phy-cells : Shall be 0
+
+Optional properties:
+- status : Shall be "ok" if enabled or "na" if disabled. Default
+ is "ok".
+- txeyetuning : Manual control to fine tune the capture of the serial
+ bit lines from the automatic calibrated position.
+ Two set of 3-tuple setting for Gen1, Gen2, and Gen3.
+ Range from 0 to 0x7f. Default is 0xa.
+- txeyedirection : 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 Gen1, Gen2, and Gen3.
+ Default is 0x0.
+- txboostgain : Frequency boost and DC gain control. Two set of
+ 3-tuple setting for Gen1, Gen2, and Gen3. Range is
+ between 0 to 0x1f. Default is 0x3.
+- txspeed : Tx operating speed. Two set of 3-tuple for
+ Gen1 (0x1), Gen2 (0x3), and Gen3 (0x7). Default is
+ 0x7.
+
+NOTE: PHY override parameters are board specific setting.
+
+Example:
+ sataphy0: sataphy@1f210000 {
+ compatible = "apm,xgene-ahci-phy";
+ reg = <0x0 0x1f210000 0x0 0x10000>;
+ #phy-cells = <0>;
+ status = "na";
+ };
+
+ sataphy1: sataphy@1f220000 {
+ compatible = "apm,xgene-ahci-phy";
+ reg = <0x0 0x1f220000 0x0 0x10000>;
+ #phy-cells = <0>;
+ status = "ok";
+ };
+
+ sataphy2: sataphy@1f230000 {
+ compatible = "apm,xgene-ahci-phy2";
+ reg = <0x0 0x1f230000 0x0 0x10000
+ 0x0 0x1f2d0000 0x0 0x10000 >;
+ #phy-cells = <0>;
+ status = "ok";
+ };
+
--
1.5.5
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