linux-kernel - Re: [PATCH v1 2/3] Documentation: gpio: Add a section on what to return in ->get() callback

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Message-ID: <CACRpkdb67ygsEuZhRZ9TGmmNXhiU2LsuefD0-48xtCLx3fq-KA@mail.gmail.com>
Date:   Wed, 7 Dec 2022 01:06:46 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Kent Gibson <warthog618@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Marc Zyngier <maz@...nel.org>, linux-gpio@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Corbet <corbet@....net>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v1 2/3] Documentation: gpio: Add a section on what to
 return in ->get() callback

On Mon, Dec 5, 2022 at 2:43 AM Kent Gibson <warthog618@...il.com> wrote:

> My preference would be for the driver API to be extended with a new
> callback for the output buffer, say get_output(), and have the existing
> get() always return the input buffer.

This has a certain elegance to it, as it cuts to the bone of the
problem and partition it in two halves, reflecting the two pieces
of hardware: input and output buffer. Also follows Rusty Russells
API hierarchy.

Yours,
Linus Walleij