linux-kernel - Re: [RFC PATCH 4/5] gpio: gpiolib: Add sysfs support for maintaining GPIO values on reset

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Message-ID: <CACRpkdZ9HpXXuauRtVjA9n1dwF3sUQ4gJL-FOUMcMBDCL9oxYw@mail.gmail.com>
Date:   Fri, 20 Oct 2017 09:29:27 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Joel Stanley <joel@....id.au>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        patches@...nsource.cirrus.com,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        linux-aspeed@...ts.ozlabs.org
Subject: Re: [RFC PATCH 4/5] gpio: gpiolib: Add sysfs support for maintaining
 GPIO values on reset

On Fri, Oct 20, 2017 at 5:37 AM, Andrew Jeffery <andrew@...id.au> wrote:

> Expose a new 'maintain' sysfs attribute to control both suspend and
> reset tolerance.
>
> Signed-off-by: Andrew Jeffery <andrew@...id.au>

NAK. You will find the actual ABI documentation in
Documentation/ABI/obsolete/sysfs-gpio
that's why. This is being phased out and should not be extended.
Everyone should use the character device, especially for new
functionality.

Yours,
Linus Walleij