linux-kernel - Re: [PATCH 1/3] gpio: dt-bindings: add new property to wd,mbl-gpio bindings

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Message-ID: <CACRpkdYyRXx-Q4NYEUzpvmBEvyW5b9TVw7DngphhV56VJJCESw@mail.gmail.com>
Date:   Fri, 27 Jan 2023 13:57:57 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     nl250060@....com
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] gpio: dt-bindings: add new property to wd,mbl-gpio bindings

Hi Niall,

thanks for your patch!

On Thu, Jan 26, 2023 at 11:18 AM Niall Leonard via B4 Submission
Endpoint <devnull+nl250060.ncr.com@...nel.org> wrote:

>  Optional properties:
>         - no-output: GPIOs are read-only.
> +       - no-input: GPIOs are write-only. Read is via a shadow register.

"Shadow register" is unclear technical lingo.

Just write "GPIO output registers are write-only"

DT bindings are OS neutral, the fact that Linux and other OS:es need to
cache ("shadow") this value is an implementation detail.

Yours,
Linus Walleij