linux-kernel - Re: [RFC PATCH] gpiolib: Provide and export gpiod_export

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Message-ID: <20140813002905.GA31412@roeck-us.net>
Date:	Tue, 12 Aug 2014 17:29:05 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [RFC PATCH] gpiolib: Provide and export gpiod_export_name

On Mon, Aug 11, 2014 at 03:05:54PM -0700, Alexandre Courbot wrote:
> On Mon, Aug 11, 2014 at 9:13 AM, Guenter Roeck <linux@...ck-us.net> wrote:
> > On 08/11/2014 08:20 AM, Alexandre Courbot wrote:
> > [ ... ]
> >
> >>
> >> Note that this doesn't change anything to the core of the argument ;
> >> we have not heard what Linus thinks about named GPIOs in
> >> /sys/class/gpio yet, maybe he will have a different opinion...
> >>
> >
> > Well, please let me know if/when you are planning to take away
> > that existing ABI so I can plan accordingly. FWIW, out-of-kernel
> > users I am currently aware of are Juniper Networks and Zodiac
> > Aerospace. The latter asked me to help them upstreaming their code.
> >
> > If you plan to remove the ABI, you might want to inform its current
> > in-kernel users. You can look those up yourself.
> 
> We are not taking existing user-space ABIs away. But we are also not
> encouraging people to use bad ABIs by introducing new ways to use
> them, hence my restraint towards this patch.
> 

You bring it to the point. You believe that the gpio ABI, or maybe just
named gpio pins, is a bad idea. Nothing I am going to say will influence
that opinion; all we do is to keep turning in circles.

So let's stop wasting our time, agree to disagree, and move on.

Thanks,
Guenter
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