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Commit 1ef39808 authored by Qipan Li's avatar Qipan Li Committed by Greg Kroah-Hartman
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serial: sirf: add DT-binding document to describle detailed properties 



we defined some special properties for hardware flow control, document them
for DT-binding.

Signed-off-by: default avatarQipan Li <Qipan.Li@csr.com>
Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2eb5618d

Documentation/devicetree/bindings/tty/serial/sirf-uart.txt

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* CSR SiRFprimaII/atlasVI Universal Synchronous Asynchronous Receiver/Transmitter *



Required properties:

- compatible : Should be "sirf,prima2-uart" or "sirf, prima2-usp-uart"

- reg : Offset and length of the register set for the device

- interrupts : Should contain uart interrupt

- fifosize : Should define hardware rx/tx fifo size

- clocks : Should contain uart clock number



Optional properties:

- sirf,uart-has-rtscts: we have hardware flow controller pins in hardware

- rts-gpios: RTS pin for USP-based UART if sirf,uart-has-rtscts is true

- cts-gpios: CTS pin for USP-based UART if sirf,uart-has-rtscts is true



Example:



uart0: uart@b0050000 {

	cell-index = <0>;

	compatible = "sirf,prima2-uart";

	reg = <0xb0050000 0x1000>;

	interrupts = <17>;

	fifosize = <128>;

	clocks = <&clks 13>;

};



On the board-specific dts, we can put rts-gpios and cts-gpios like



usp@b0090000 {

	compatible = "sirf,prima2-usp-uart";

	sirf,uart-has-rtscts;

	rts-gpios = <&gpio 15 0>;

	cts-gpios = <&gpio 46 0>;

};