linux-kernel - Re: [RFC PATCH] gpio: uapi: v2 proposal

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Message-ID: <CAMpxmJVzMJkPSrL4uhfCgjXb7CkLSOH3kW=aeb68LRNJenKRiQ@mail.gmail.com>
Date:   Thu, 4 Jun 2020 14:06:31 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Kent Gibson <warthog618@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [RFC PATCH] gpio: uapi: v2 proposal

śr., 27 maj 2020 o 07:58 Linus Walleij <linus.walleij@...aro.org> napisał(a):
>
> On Mon, May 25, 2020 at 4:19 PM Kent Gibson <warthog618@...il.com> wrote:
>
> > > > +struct gpioline_config {
> > > > +       __u8 default_values[GPIOLINES_MAX];
> > >
> > > So 32 bytes
> > >
> >
> > Actually that one is 64 bytes, which is the same as v1, i.e. GPIOLINES_MAX
> > is the same as GPIOHANDLES_MAX - just renamed.
> >
> > On the subject of values, is there any reason to use a byte for each line
> > rather value than a bit?
>
> Not really, other than making things simple for userspace.
>

I'm in favor of using bits here. I think we can rely on libgpiod to
make things simple for user-space, the kernel interface can be as
brief as possible.

Bart