linux-kernel - Re: [PATCH v5 00/20] gpio: cdev: add uAPI v2

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Message-ID: <CACRpkdZroNFFsHoBHUFTUUQij7nOcPQiXP-567+fH-Xerv=L4w@mail.gmail.com>
Date:   Fri, 28 Aug 2020 16:37:19 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Kent Gibson <warthog618@...il.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v5 00/20] gpio: cdev: add uAPI v2

On Fri, Aug 28, 2020 at 12:47 AM Kent Gibson <warthog618@...il.com> wrote:

> The particular use case I am considering is one I had been asked about -
> changing a requested line from input with edge detection to output, and
> vice versa. Losing interrupts isn't really an issue for this use case -
> it is expected.  Yet the current implementation requires a re-request.

This is possible to do for in-kernel users, but I don't know if that makes
sense for userspace. It is for one-offs and prototyping after all, there
is no need (IMO) to make it overly convenient for users to implement
all kind of weirdness in userspace unless there is a very real use case.

Yours,
Linus Walleij