linux-kernel - Re: [PATCH v2 1/3] dt-bindings: gpio: loongson: Document GPIO controller of 2K0300 SoC

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Message-ID: <aLW0rgvKno3zpXDi@pie>
Date: Mon, 1 Sep 2025 14:58:54 +0000
From: Yao Zi <ziyao@...root.org>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Yinbo Zhu <zhuyinbo@...ngson.cn>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, WANG Xuerui <kernel@...0n.name>,
	Philipp Zabel <p.zabel@...gutronix.de>, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev, Mingcong Bai <jeffbai@...c.io>,
	Kexy Biscuit <kexybiscuit@...c.io>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v2 1/3] dt-bindings: gpio: loongson: Document GPIO
 controller of 2K0300 SoC

On Mon, Sep 01, 2025 at 10:22:04PM +0800, Huacai Chen wrote:
> Hi, Yao,
> 
> On Mon, Sep 1, 2025 at 9:38 PM Yao Zi <ziyao@...root.org> wrote:
> >
> > Loongson 2K0300 ships a GPIO controller whose input/output control logic
> > is similar to previous generation of SoCs. Additionally, it acts as an
> > interrupt-controller supporting both level and edge interrupts and has a
> > distinct reset signal.
> >
> > Describe its compatible in devicetree. We enlarge the maximum value of
> > ngpios to 128, since the controller technically supports at most 128
> > pins, although only 106 are routed out of the package. Properties for
> > interrupt-controllers and resets are introduced and limited as 2K0300
> > only.
> Replace the full name with "Loongson-2K0300" and short name with
> "LS2K0300", others look good to me.
> Reviewed-by: Huacai Chen <chenhuacai@...ngson.cn>

I don't understand what is improved with this. For the fullname, I don't
see any difference between "Loongson 2K0300" and "Loongson-2K0300". And
for the short one, omitting the "LS" prefix doesn't introduce any
ambiguity, either.

I did a quick search through git log, and found many commits for Loongson
2K SoCs do include a hyphen for the fullname and "LS" prefix for
abbreviation in messages, while some merge commits don't do so.

Even the official production page for Loongson 2K0300 refers to it
without a hyphen[1]. Thus I cannot find out of the point of rewording...

> Loongson 2K0300 is a multi-function SoC build upon the LA264 processor
> core, ...

I'll appreciate and adapt it if you could explain why the change is
necessary. Thanks for your patience.

Best regards,
Yao Zi

[1]: https://loongson.cn/EN/product/show?id=35

> >
> > Signed-off-by: Yao Zi <ziyao@...root.org>
> > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> > ---
> >  .../bindings/gpio/loongson,ls-gpio.yaml       | 28 ++++++++++++++++++-
> >  1 file changed, 27 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml b/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
> > index b68159600e2b..69852444df23 100644
> > --- a/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
> > +++ b/Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
> > @@ -14,6 +14,7 @@ properties:
> >      oneOf:
> >        - enum:
> >            - loongson,ls2k-gpio
> > +          - loongson,ls2k0300-gpio
> >            - loongson,ls2k0500-gpio0
> >            - loongson,ls2k0500-gpio1
> >            - loongson,ls2k2000-gpio0
> > @@ -36,7 +37,7 @@ properties:
> >
> >    ngpios:
> >      minimum: 1
> > -    maximum: 64
> > +    maximum: 128
> >
> >    "#gpio-cells":
> >      const: 2
> > @@ -49,6 +50,14 @@ properties:
> >      minItems: 1
> >      maxItems: 64
> >
> > +  "#interrupt-cells":
> > +    const: 2
> > +
> > +  interrupt-controller: true
> > +
> > +  resets:
> > +    maxItems: 1
> > +
> >  required:
> >    - compatible
> >    - reg
> > @@ -58,6 +67,23 @@ required:
> >    - gpio-ranges
> >    - interrupts
> >
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: loongson,ls2k0300-gpio
> > +    then:
> > +      required:
> > +        - "#interrupt-cells"
> > +        - interrupt-controller
> > +        - resets
> > +    else:
> > +      properties:
> > +        "#interrupts-cells": false
> > +        interrupt-controller: false
> > +        resets: false
> > +
> >  additionalProperties: false
> >
> >  examples:
> > --
> > 2.50.1
> >
> >
>