linux-kernel - Re: [PATCH 2/3] Add support for monitoring gpio switches

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Message-ID: <CACRpkdZWXnR0tUbr9KeX3KPEe11pUYC5ZcBkX8jvUx3fREwHgQ@mail.gmail.com>
Date:	Tue, 22 Dec 2015 10:25:06 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Martyn Welch <martyn.welch@...labora.co.uk>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kukjin Kim <kgene@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] Add support for monitoring gpio switches

On Wed, Dec 16, 2015 at 11:11 AM, Martyn Welch
<martyn.welch@...labora.co.uk> wrote:

>> Patches like that has however already been suggested, and I have NACKed
>> them because the GPIO sysfs ABI is insane, and that is why I am
>> refactoring
>> the world to create a proper chardev ABI for GPIO instead. See:
>> http://marc.info/?l=linux-gpio&m=144550276512673&w=2
>
> I can certainly understand the rationale for the changes that you are
> proposing, though do worry that it does make it a bit tougher to use from
> scripting languages.

The idea is to provide commandline tools in the kernel tools/gpio subdir
to satisfy the needs of scripting. "lsgpio" today is just one example,
nothing stops us from having a tool called just "gpio-sak"
(GPIO swiss army knife) that will be tailored for scripting.

> I see that the question of how to provide functionality
> equivalent to the above was raised and no answer was forthcoming. Is there a
> plan for supporting the identification of a GPIO line serving a specific
> purpose?

Yes by name.

> What is the status of the mentioned patch series?

They stubled into a few dozen architecture issues in the GPIO
subsystem so I am busy refactoring the whole know universe :D

But I still intend to persue the series.

Yours,
Linus Walleij
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