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spi: sirf: add support for USP-based SPI

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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>
This commit is contained in:
Qipan Li 2015-05-19 14:41:12 +00:00 committed by Mark Brown
parent a34bcbedf8
commit e3fb57c832
2 changed files with 583 additions and 206 deletions
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3
Documentation/devicetree/bindings/spi/spi-sirf.txt
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@ -1,7 +1,8 @@
* CSR SiRFprimaII Serial Peripheral Interface
Required properties:
- compatible : Should be "sirf,prima2-spi"
- compatible : Should be "sirf,prima2-spi", "sirf,prima2-usp"
or "sirf,atlas7-usp"
- reg : Offset and length of the register set for the device
- interrupts : Should contain SPI interrupt
- resets: phandle to the reset controller asserting this device in

786
drivers/spi/spi-sirf.c
View file

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