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

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Date:   Mon, 11 Jul 2022 15:52:34 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        p.yadav@...com, miquel.raynal@...tlin.com, richard@....at,
        vigneshr@...com, git@...inx.com, linux-spi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        michael@...le.cc, linux-mtd@...ts.infradead.org
Subject: Re: [RFC PATCH 1/2] spi: Add multiple CS support for a single SPI
 device

On Mon, Jul 11, 2022 at 02:47:54PM +0200, Michal Simek wrote:
> On 6/9/22 13:54, Mark Brown wrote:
> > On Mon, Jun 06, 2022 at 04:56:06PM +0530, Amit Kumar Mahapatra wrote:

> > > +	u32 cs[SPI_CS_CNT_MAX];
> > > +	u8 idx;
> > >   	/* Mode (clock phase/polarity/etc.) */
> > >   	if (of_property_read_bool(nc, "spi-cpha"))

> > This is changing the DT binding but doesn't have any updates to the
> > binding document.  The binding code also doesn't validate that we don't
> > have too many chip selects.

> I would like to better understand your request here in connection to change
> in the binding code for validation.
> What exactly do you want to validate?
> That child reg property is not bigger than num-cs in controller node?

If you are adding support for multiple chip selects in the driver then
there must be some mechanism for expressing that in the bindings which I
would expect to see appear as a change to the binding document.

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