linux-kernel - Re: [PATCH v2 0/3] SPI core CS delay fixes and additions

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Date:   Thu, 16 Feb 2023 10:04:11 +0100
From:   Janne Grunau <j@...nau.net>
To:     Mark Brown <broonie@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Hector Martin <marcan@...can.st>,
        Kazuki <kazukih0205@...il.com>
Subject: Re: [PATCH v2 0/3] SPI core CS delay fixes and additions

Hej Mark,

On 2023-02-15 03:52:34 +0900, Kazuki wrote:
> On Fri, Jan 13, 2023 at 03:57:26PM +0000, Mark Brown wrote:
> > On Fri, 13 Jan 2023 19:23:07 +0900, Hector Martin wrote:
> > > Commits f6c911f3308c ("spi: dt-bindings: Introduce
> > > spi-cs-setup-ns property") and 33a2fde5f77b ("spi: Introduce
> > > spi-cs-setup-ns property") introduced a new property to represent the
> > > CS setup delay in the device tree, but they have some issues:
> > > 
> > > - The property is only parsed as a 16-bit integer number of nanoseconds,
> > >   which limits the maximum value to ~65us. This is not a reasonable
> > >   upper limit, as some devices might need a lot more.
> > > - The property name is inconsistent with other delay properties, which
> > >   use a "*-delay-ns" naming scheme.
> > > - Only the setup delay is introduced, but not the related hold and
> > >   inactive delay times.
> > > 
> > > [...]
> > 
> > Applied to
> > 
> >    https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
> > 
> > Thanks!
> > 
> > [1/3] spi: Use a 32-bit DT property for spi-cs-setup-delay-ns
> >       commit: f276aacf5d2f7fb57e400db44c807ea3b9525fd6
> 
> Shouldn't this be sent to 6.2 before the property becomes a stable ABI?

can we still get "spi: Use a 32-bit DT property for 
spi-cs-setup-delay-ns" into 6.2?

If not I can send a single line patch which switches 
of_property_read_u16() to of_property_read_u32() to avoid defining 
"spi-cs-setup-delay-ns" to u16 as stable devicetree ABI.

sorry this comes so late before 6.2, we missed to track the patches.

Thanks,
Janne