linux-kernel - Re: [PATCH 3/5] spi: Use a 32-bit DT property for spi-cs-setup-delay-ns

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Message-ID: <Y7hLrxQO9GbgpW1h@sirena.org.uk>
Date:   Fri, 6 Jan 2023 16:26:23 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Janne Grunau <j@...nau.net>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Hector Martin <marcan@...can.st>
Cc:     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>
Subject: Re: [PATCH 3/5] spi: Use a 32-bit DT property for
 spi-cs-setup-delay-ns

On Wed, Jan 04, 2023 at 06:36:29PM +0900, Janne Grunau wrote:

> 65us is not a reasonable maximum for this property, as some devices
> might need a much longer setup time (e.g. those driven by firmware on
> the other end). Plus, device tree property values are in 32-bit cells
> and smaller widths should not be used without good reason.

This breaks allmodconfig builds (I tested x86 but this should happen
for anything with -Werror):

/build/stage/linux/drivers/spi/spi.c: In function ‘of_spi_parse_dt’:
/build/stage/linux/drivers/spi/spi.c:2243:13: error: unused variable ‘cs_setup’ [-Werror=unused-variable]
 2243 |         u16 cs_setup;
      |             ^~~~~~~~
cc1: all warnings being treated as errors

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