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Commit 3420fdfa authored by Linus Walleij's avatar Linus Walleij Committed by Tejun Heo
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ata: Add DT bindings for the Gemini SATA bridge 



This adds device tree bindings for the Cortina Systems Gemini
PATA to SATA bridge.

Cc: devicetree@vger.kernel.org
Cc: John Feng-Hsin Chiang <john453@faraday-tech.com>
Cc: Greentime Hu <green.hu@gmail.com>
Acked-by: default avatarHans Ulli Kroll <ulli.kroll@googlemail.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent af36ddc9

Documentation/devicetree/bindings/ata/cortina,gemini-sata-bridge.txt

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* Cortina Systems Gemini SATA Bridge



The Gemini SATA bridge in a SoC-internal PATA to SATA bridge that

takes two Faraday Technology FTIDE010 PATA controllers and bridges

them in different configurations to two SATA ports.



Required properties:

- compatible: should be

  "cortina,gemini-sata-bridge"

- reg: registers and size for the block

- resets: phandles to the reset lines for both SATA bridges

- reset-names: must be "sata0", "sata1"

- clocks: phandles to the compulsory peripheral clocks

- clock-names: must be "SATA0_PCLK", "SATA1_PCLK"

- syscon: a phandle to the global Gemini system controller

- cortina,gemini-ata-muxmode: tell the desired multiplexing mode for

  the ATA controller and SATA bridges. Values 0..3:

  Mode 0: ata0 master <-> sata0

          ata1 master <-> sata1

          ata0 slave interface brought out on IDE pads

  Mode 1: ata0 master <-> sata0

          ata1 master <-> sata1

          ata1 slave interface brought out on IDE pads

  Mode 2: ata1 master <-> sata1

          ata1 slave  <-> sata0

          ata0 master and slave interfaces brought out

               on IDE pads

  Mode 3: ata0 master <-> sata0

          ata0 slave  <-> sata1

          ata1 master and slave interfaces brought out

               on IDE pads



Optional boolean properties:

- cortina,gemini-enable-ide-pins: enables the PATA to IDE connection.

  The muxmode setting decides whether ATA0 or ATA1 is brought out,

  and whether master, slave or both interfaces get brought out.

- cortina,gemini-enable-sata-bridge: enables the PATA to SATA bridge

  inside the Gemnini SoC. The Muxmode decides what PATA blocks will

  be muxed out and how.



Example:



sata: sata@46000000 {

	compatible = "cortina,gemini-sata-bridge";

	reg = <0x46000000 0x100>;

	resets = <&rcon 26>, <&rcon 27>;

	reset-names = "sata0", "sata1";

	clocks = <&gcc GEMINI_CLK_GATE_SATA0>,

		 <&gcc GEMINI_CLK_GATE_SATA1>;

	clock-names = "SATA0_PCLK", "SATA1_PCLK";

	syscon = <&syscon>;

	cortina,gemini-ata-muxmode = <3>;

	cortina,gemini-enable-ide-pins;

	cortina,gemini-enable-sata-bridge;

};