linux-kernel - Re: [PATCH 1/8] spi: dt-bindings: Introduce spi-cs-setup-ns property

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Message-ID: <Y3elIdM3Xz1H4kKk@sirena.org.uk>
Date:   Fri, 18 Nov 2022 15:30:41 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Michael Walle <michael@...le.cc>
Cc:     tudor.ambarus@...rochip.com, alexandre.belloni@...tlin.com,
        claudiu.beznea@...rochip.com, devicetree@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org,
        nicolas.ferre@...rochip.com, robh+dt@...nel.org
Subject: Re: [PATCH 1/8] spi: dt-bindings: Introduce spi-cs-setup-ns property

On Fri, Nov 18, 2022 at 03:14:58PM +0100, Michael Walle wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>

> > +  spi-cs-setup-ns:
> > +    description:
> > +      Delay in nanosecods to be introduced by the controller after CS is
> > +      asserted.

> Does this need a type as the spi-cs-setup-ns is apparently just 16bit? At
> least the driver uses it that way.

> But IMHO this should just be a normal uint32 value to be consistent with
> all the other properties. Also the max value with 16bit will be 'just'
> 65us.

Making it 32 bit does seem safer.  I've applied the series
already, mainly for the reintroduction of spi_set_cs_timing()
since there was another driver that needed it, but we can still
fix things up until the merge window.

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