diff options
author | Qipan Li <Qipan.Li@csr.com> | 2013-08-15 02:52:16 +0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-15 05:33:09 +0400 |
commit | 1ef39808ca27837017a433f94aa7055cb8490e80 (patch) | |
tree | cc2b8a181fe21d51071154a410741494d771d512 | |
parent | 2eb5618de87927e540055edc625b22f2d5662ab5 (diff) | |
download | linux-1ef39808ca27837017a433f94aa7055cb8490e80.tar.xz |
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: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | Documentation/devicetree/bindings/tty/serial/sirf-uart.txt | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/tty/serial/sirf-uart.txt b/Documentation/devicetree/bindings/tty/serial/sirf-uart.txt new file mode 100644 index 000000000000..a2dfc6522a91 --- /dev/null +++ b/Documentation/devicetree/bindings/tty/serial/sirf-uart.txt @@ -0,0 +1,33 @@ +* 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>; +}; |