spi: dw: support 4-16 bits per word
The spi-dw driver currently only supports 8 or 16 bits per word. Since the hardware supports 4-16 bits per word, adapt the driver to also support this. Tested on socfpga cyclone5 with a 9-bit SPI display. Signed-off-by: NSimon Goldschmidt <simon.k.r.goldschmidt@gmail.com> Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: NMark Brown <broonie@kernel.org>
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