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USP is a general purpose serial port in SiRFSoC, which can work as SPI. the most data flow of USP and pure SPI is same with main differences in registers layout. this patch moves registers layout to private data, and use flags to differentiate other minor differences between prima2-spi, prima2-usp and atlas7-usp for hardware configuration. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Mark Brown <broonie@kernel.org>
43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
* CSR SiRFprimaII Serial Peripheral Interface
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Required properties:
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- compatible : Should be "sirf,prima2-spi", "sirf,prima2-usp"
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or "sirf,atlas7-usp"
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- reg : Offset and length of the register set for the device
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- interrupts : Should contain SPI interrupt
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- resets: phandle to the reset controller asserting this device in
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reset
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See ../reset/reset.txt for details.
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- dmas : Must contain an entry for each entry in clock-names.
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See ../dma/dma.txt for details.
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- dma-names : Must include the following entries:
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- rx
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- tx
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- clocks : Must contain an entry for each entry in clock-names.
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See ../clocks/clock-bindings.txt for details.
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- #address-cells: Number of cells required to define a chip select
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address on the SPI bus. Should be set to 1.
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- #size-cells: Should be zero.
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Optional properties:
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- spi-max-frequency: Specifies maximum SPI clock frequency,
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Units - Hz. Definition as per
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Documentation/devicetree/bindings/spi/spi-bus.txt
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- cs-gpios: should specify GPIOs used for chipselects.
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Example:
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spi0: spi@b00d0000 {
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compatible = "sirf,prima2-spi";
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reg = <0xb00d0000 0x10000>;
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interrupts = <15>;
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dmas = <&dmac1 9>,
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<&dmac1 4>;
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dma-names = "rx", "tx";
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#address-cells = <1>;
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#size-cells = <0>;
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clocks = <&clks 19>;
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resets = <&rstc 26>;
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};
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