linux-kernel - Re: [PATCH 01/16] spi: armada-3700: Drop of_match

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Date:   Mon, 13 Mar 2023 19:22:10 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Kamal Dasu <kdasu.kdev@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Heiko Stuebner <heiko@...ech.de>,
        Andi Shyti <andi@...zian.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 01/16] spi: armada-3700: Drop of_match_ptr for ID table

On Mon, Mar 13, 2023 at 07:39:45PM +0100, Krzysztof Kozlowski wrote:
> On 13/03/2023 14:55, Mark Brown wrote:
> > On Fri, Mar 10, 2023 at 11:28:42PM +0100, Krzysztof Kozlowski wrote:

> >>   drivers/spi/spi-armada-3700.c:807:34: error: ‘a3700_spi_dt_ids’ defined but not used [-Werror=unused-const-variable=]

> > It would be much better to fix of_match_ptr() and/or the module stuff
> > that also references the match table here.

> Why? The recommendation is in general not to use of_match_ptr, because
> there are little benefits but it disables matching via PRP0001. Jonathan
> in parallel thread explicitly said of_match_ptr should disappear and he
> is not accepting any new code with it. And in general he is right.

If that's the case then why are you adding maybe unused annotations for
half the drivers rather than removing their of_match_ptr() usages?
There doesn't seem to be any logic here, it's just randomly making
changes as far as I can tell.

The PRP0001 stuff isn't an issue, of_match_ptr() can just be changed to
do the right thing for CONFIG_ACPI.  It doesn't buy us huge amounts but
it also costs us very little and may be useful in future.  When there's
missing annotations it's not causing issues for practical configurations
as far as I can tell, and if the macro were updated for CONFIG_ACPI it'd
be even less of an issue.

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