Re: [RFC PATCH 1/2] spi: Add multiple CS support for a single SPI device

[Mark Brown]

On Tue, Jul 19, 2022 at 01:21:41PM +0000, Mahapatra, Amit Kumar wrote:

> I agree, so for checking the controller multiple chip select capability(using 
> more than one chip select at once) we can define a new spi controller DT 
> property like "multi-cs-cap"(please suggest a better name). 
> The controller that can support multiple chip selects should have this property 
> in the spi controller DT node. The spi core will check ctlr->multi-cs-cap to 
> operate multiple chip select in parallel.

I'm not sure this needs to be a DT property, it's more just something we
infer from the compatible.  The name seems fine, as does the flag in the
controller data.

> > the chip selects are available and that the controller can do something useful
> > with them (and probably have an implementation in the core for doing so via
> > GPIO).

> Here are you referring to the usecase in which a controller implementing multi CS
> support using GPIO?  

Yes, we probably ought to.

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