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* spi: spidev_test: Add support for Dual/Quad SPI TransfersGeert Uytterhoeven2014-02-271-6/+37
| | | | | Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org> Signed-off-by: Mark Brown <broonie@linaro.org>
* spi/spidev_test: Document -N/--no-cs and -R/--readyGeert Uytterhoeven2014-02-221-1/+3
| | | | | | | | | commit b55f627feeb9d48fdbde3835e18afbc76712e49b ("spi: new spi->mode bits") added two new command line options without adding the respective help texts. Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org> Signed-off-by: Mark Brown <broonie@linaro.org>
* spi: spidev_test gives error upon 1-byte transferHector Palacios2010-04-291-1/+1
| | | | | | | | | | | | | The sample application spidev_test.c is using SPI_IOC_MESSAGE ioctl to do an SPI transfer. This ioctl returns the number of bytes successfully transmitted or a negative error code upon erroneous completion. The application however is returning an error if the result of the ioclt if the return value is 1. This makes the application to fail upon 1-byte length transfers. Signed-off-by: Hector Palacios <hector.palacios@digi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
* Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGSLadinu Chandrasinghe2009-09-231-2/+2
| | | | | | | | | | | Fix up -Wmissing-prototypes in compileable userspace code, mainly under Documentation/. Signed-off-by: Ladinu Chandrasinghe <ladinu.pub@gmail.com> Signed-off-by: Trevor Keith <tsrk@tsrk.net> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* spi: new spi->mode bitsDavid Brownell2009-06-301-1/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add two new spi_device.mode bits to accomodate more protocol options, and pass them through to usermode drivers: * SPI_NO_CS ... a second 3-wire variant, where the chipselect line is removed instead of a data line; transfers are still full duplex. This obviously has STRONG protocol implications since the chipselect transitions can't be used to synchronize state transitions with the SPI master. * SPI_READY ... defines open drain signal that's pulled low to pause the clock. This defines a 5-wire variant (normal 4-wire SPI plus READY) and two 4-wire variants (READY plus each of the 3-wire flavors). Such hardware flow control can be a big win. There are ADC converters and flash chips that expose READY signals, but not many host controllers support it today. The spi_bitbang code should be changed to use SPI_NO_CS instead of its current nonportable hack. That's a mode most hardware can easily support (unlike SPI_READY). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: "Paulraj, Sandeep" <s-paulraj@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Documentation/spi/spidev_test.c: constify some variablesWANG Cong2007-10-161-3/+3
| | | | | | | | | | Constify two char pointers and a struct in Documentation/spi/spidev_test.c. Acked-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* spidev_test utilityAnton Vorontsov2007-07-311-0/+202
This is a simple utility used to test SPI functionality. It could stand growing options to support using other test data patterns; this initial version only issues full duplex transfers, which rules out 3WIRE or Microwire links. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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