linux-kernel - Re: [PATCH] dt-bindings: power: reset: gpio-restart: Correct default priority

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Message-ID: <Yd46ayLnvT/3ch9e@robh.at.kernel.org>
Date:   Tue, 11 Jan 2022 20:18:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sander Vanheule <sander@...nheule.net>
Cc:     Sebastian Reichel <sre@...nel.org>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] dt-bindings: power: reset: gpio-restart: Correct default
 priority

On Mon, 10 Jan 2022 22:44:56 +0100, Sander Vanheule wrote:
> Commit bcd56fe1aa97 ("power: reset: gpio-restart: increase priority
> slightly") changed the default restart priority 129, but did not update
> the documentation. Correct this, so the driver and documentation have
> the same default value.
> 
> Signed-off-by: Sander Vanheule <sander@...nheule.net>
> ---
> This is a resubmission of RFC:
> https://lore.kernel.org/all/cfcd00257daba5aa30b8d20a62ba542be1a6914c.1640887456.git.sander@svanheule.net/
> 
> The commit message for bcd56fe1aa97 mentions that it is a workaround for
> rk3288-veryon boards. However, commit e28ea9dbc52d3 ("ARM: dts:
> rockchip: add shared rk3288-veyron files") later adds a gpio-restart
> node with a priority value of <200> for those boards, effectively
> rendering bcd56fe1aa97 obsolete (for their use case).
> 
> Perhaps bcd56fe1aa97 could just be reverted instead of updating the
> documentation.
> 
> An argument against reverting (a 6 year old patch) is that other boards
> may have come to depend on the default value of 129. I don't know about
> out-of-tree user of gpio-restart, but there are a few in-tree users of
> gpio-restart /without/ an explicit priority:
> 
> arch/arm/boot/dts/imx53-ppd.dts (commit 2952d67637716)
>   DTS submitted after changed default, but DTS copyright predates the
>   changed default.
> 
> arch/microblaze/boot/dts/system.dts (commit 7cca9b8b7c5bc)
>   The original DTS commit predates the changed default, but didn't use
>   gpio-restart. The commit adding gpio-restart appears to indicate no
>   other restart handlers are present on this platform, although it could
>   be these were just being shadowed by the custom restart code.
> 
> arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts (commit 0a91330b2af9f)
>   Recently added board; couldn't find any obvious alternative restart
>   handlers.
> 
> Best,
> Sander
> 
>  .../devicetree/bindings/power/reset/gpio-restart.yaml         | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>