linux-kernel - Re: [PATCH] dt-bindings: pinctrl: pinctrl-single: Define a max count for "pinctrl-single,gpio-range"

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Date: Tue, 18 Jun 2024 13:57:05 -0500
From: Nishanth Menon <nm@...com>
To: "Rob Herring (Arm)" <robh@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>, <linux-gpio@...r.kernel.org>,
        Linus
 Walleij <linus.walleij@...aro.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] dt-bindings: pinctrl: pinctrl-single: Define a max count
 for "pinctrl-single,gpio-range"

On 12:34-20240618, Rob Herring wrote:
> 
> On Tue, 18 Jun 2024 11:51:02 -0500, Nishanth Menon wrote:
> > "pinctrl-single,gpio-range" allows us to define a dis-contiguous
> > range of pinctrl registers that can have different mux settings for
> > GPIO mode of operation. However, the maxItems seem to be set to 1 in
> > processed schema for some reason. This is incorrect. For example:
> > arch/arm64/boot/dts/hisilicon/hi6220.dtsi and others have more than
> > one dis-contiguous range.
> > 
> > Arbitrarily define a max 100 count to override the defaults.
> > 
> > Signed-off-by: Nishanth Menon <nm@...com>
> > ---
> > I am not sure if I should call this RFC or not.. and if this is even the
> > right solution.. I am on 2024.05 dt-schema for this check.
> > 
> > I noticed this when adding gpio-ranges for am62p platform:
> > https://gist.github.com/nmenon/7019cd2f24be47997640df5db60a7544
> > 
> > It is possible that this is a bug in dt-schema, but I have'nt been able
> > to track it down either.
> > 
> > behavior seen is the following:
> > pinctrl-single,gpio-range = <&mcu_pmx_range 0 21 7>;
> > generates no warning
> > However,
> > pinctrl-single,gpio-range = <&mcu_pmx_range 0 21 7>, <&mcu_pmx_range 32 2 7>;
> > 
> > generates "is too long" warning.
> > 
> > 
> >  Documentation/devicetree/bindings/pinctrl/pinctrl-single.yaml | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> 
> My bot found errors running 'make dt_binding_check' on your patch:
> 
> yamllint warnings/errors:
> 
> dtschema/dtc warnings/errors:
> /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/pinctrl/pinctrl-single.yaml: properties:pinctrl-single,gpio-range: {'description': 'Optional list of pin base, nr pins & gpio function', '$ref': '/schemas/types.yaml#/definitions/phandle-array', 'maxItems': 100, 'items': [{'items': [{'description': 'phandle of a gpio-range node'}, {'description': 'pin base'}, {'description': 'number of pins'}, {'description': 'gpio function'}]}]} should not be valid under {'required': ['maxItems']}
> 	hint: "maxItems" is not needed with an "items" list
> 	from schema $id: http://devicetree.org/meta-schemas/items.yaml#

yes, I had expected the same, but processed schema indicates a maxItems
of 1 for reasons I am unable to make sense of.. will be great to have
some additional eyes:

https://gist.github.com/nmenon/7019cd2f24be47997640df5db60a7544#file-processed-schema-pinctrl

next-20240617 baseline
-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D