On Tue, Jan 28, 2020 at 10:20:24AM +0100, Geert Uytterhoeven wrote:
> On Tue, Jan 28, 2020 at 8:26 AM Maxim Kochetkov <fido_max@xxxxxxxx> wrote:
> > eSPI controller can't send transactions without hardware chip selects.
> > So, to use GPIO chip selects with eSPI controller we need to use one
> > dedicated hardware chip select signal. To specify shared chip select for
> > GPIO use "fsl,espi-shared-chipselect" DT property.
> Do you need a property to specify this?
> Can't the driver just pick an unused native chip select instead?
> Recently I've added generic support for that to the SPI core, cfr. commit
> 7d93aecdb58d47e8 ("spi: Add generic support for unused native cs with
> cs-gpios").
The only reason I would expect for needing this is if there's no pinmux
control so you need to make sure that the chip select used isn't going
to cause electrical problems.
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