linux-kernel - Re: [PATCH v1 2/2] dt-bindings: gpio: add loongson series gpio

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Date:   Tue, 8 Nov 2022 13:11:42 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Yinbo Zhu <zhuyinbo@...ngson.cn>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        WANG Xuerui <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Juxin Gao <gaojuxin@...ngson.cn>,
        Bibo Mao <maobibo@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
        richard.liu@...com, Arnaud Patard <apatard@...driva.com>,
        Hongbing Hu <huhb@...ote.com>,
        Huacai Chen <chenhuacai@...nel.org>
Subject: Re: [PATCH v1 2/2] dt-bindings: gpio: add loongson series gpio

Hi Yinbo,

thanks for your patch!

On Tue, Nov 8, 2022 at 10:21 AM Yinbo Zhu <zhuyinbo@...ngson.cn> wrote:

> Add the Loongson series gpio binding with DT schema format using
> json-schema.
>
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>

> +  gpio-ranges: true

So you are using GPIO ranges... and...

> +  loongson,gpio_base:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      This option indicate the first GPIO number in this node.

Then you have added this to reimplement gpio ranges.

It also shows in the driver.

Drop gpio_base altogether (we do not encode linux-specific properties
into the device trees) and use gpio-ranges as they are intended to
map between the GPIO numberspace and the pin control pin number
space.

See
Documentation/devicetree/bindings/gpio/gpio.txt
for documentation on gpio-ranges, also look how other drivers are
using them.

Yours,
Linus Walleij