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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: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Linus Walleij 2017-06-04 10:50:07 +02:00 committed by Tejun Heo
parent af36ddc988
commit 3420fdface
1 changed files with 55 additions and 0 deletions
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Documentation/devicetree/bindings/ata/cortina,gemini-sata-bridge.txt Normal file
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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;
};