spi/dt: DT bindings documentation: "num-cs" property for SPI controllers
Several SPI controller drivers have defined differently named properties for the number of chip selects. Now adding "num-cs" as a reference name for new bindings. Signed-off-by: NRoland Stigge <stigge@antcom.de> Reviewed-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
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