On Thu, Sep 03, 2020 at 11:22:20AM +0200, Matthias Schiffer wrote: > - If num-cs is set, use that > - If num-cs is unset, use the number of cs-gpios > - If num-cs is unset and no cs-gpios are defined, use a driver-provided > default (which is 3 for spi-imx; this matches the number of native CS > pins in older implementations of this SPI controller; i.MX6 and newer > support up to 4) That sounds like what's expected, though we coould just skip the first step. > Also, would it make sense to add num-cs to all DTS files for boards > that actually use fewer than 3 CS pins? No, it was never a good idea to have that property in the first place and there should be no case where it helps anything. > At the moment, the num-cs property is not explicitly documented for the > spi-imx driver, although the driver understands it. I also suggested to > add this to the docs, which Fabio didn't deem a good idea (I don't > quite understand the reasoning here - isn't num-cs generally a useful > property to have?) Could you explain what benefit you would expect having num-cs to offer?
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