linux-kernel - Re: [PATCH] Avoid error message on rk3328 use

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Message-ID: <Zhqjhvq38oNH5-sR@Z926fQmE5jqhFMgp6>
Date: Sat, 13 Apr 2024 17:23:50 +0200
From: Etienne Buira <etienne.buira@...e.fr>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>, Johan Jonker <jbx6244@...il.com>,
	Dragan Simic <dsimic@...jaro.org>,
	shironeko <shironeko@...aguri.club>,
	Etienne Buira <etienne.buira@...e.fr>,
	Jonas Karlman <jonas@...boo.se>, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Avoid error message on rk3328 use

Hi Krzysztof,

On Sat, Apr 13, 2024 at 05:09:33PM +0200, Krzysztof Kozlowski wrote:
> On 13/04/2024 15:56, Etienne Buira wrote:
> > rockchip,rk3328-grf-gpio is handled as syscon, but syscon mandates
> 
> syscon does not need such property. I see it in gpio-syscon, but not in
> syscon.

gpio-syscon, indeed.

> > presence of gpio,syscon-dev node (or it will call dev_err() when probed).
> > Correct rk3328.dtsi and related documentation to follow syscon's
> > expectations.
> 
> No, look at gpio-syscon driver. Parent is used.

Parent is used, but the next lines are:
ret = of_property_read_u32_index(np, "gpio,syscon-dev", 1, &priv->dreg_offset);
if (ret)
	dev_err(...)

So if gpio,syscon-dev does not have at least 2 items (or is missing),
dev_err will be called, 3 items for dev_dbg.
Current tree displays a spurious "can't read the data register offset"
message.

> > 
> > Signed-off-by: Etienne Buira <etienne.buira@...e.fr>
> > ---
> >  .../devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml      | 2 ++
> 
> Please run scripts/checkpatch.pl and fix reported warnings. Then please
> run `scripts/checkpatch.pl --strict` and (probably) fix more warnings.
> Some warnings can be ignored, especially from --strict run, but the code
> here looks like it needs a fix. Feel free to get in touch if the warning
> is not clear.

Will do, if we agree on the interest of patch.

> >  arch/arm64/boot/dts/rockchip/rk3328.dtsi                        | 1 +
> >  2 files changed, 3 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml b/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml
> > index d8cce73ea0ae..2c878e7db900 100644
> > --- a/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml
> > +++ b/Documentation/devicetree/bindings/gpio/rockchip,rk3328-grf-gpio.yaml
> > @@ -38,6 +38,7 @@ required:
> >    - compatible
> >    - gpio-controller
> >    - "#gpio-cells"
> > +  - gpio,syscon-dev
> 
> No, not needed. And also incomplete - where is the property defined?
> 
> It does not look like you tested the bindings, at least after quick
> look. Please run `make dt_binding_check` (see
> Documentation/devicetree/bindings/writing-schema.rst for instructions).
> Maybe you need to update your dtschema and yamllint.

ditto

Regards