linux-kernel - Re: [PATCH V1 2/3] Documentation: gpio: Add details of open-drain configuration

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Message-ID: <CACRpkdaFyxU-gq5ETnNc4LonTo98PbUs09CmvsPUqzyt0Mg2Cg@mail.gmail.com>
Date:	Thu, 16 Feb 2012 21:00:28 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	"dunlap@...otime.net" <dunlap@...otime.net>,
	"lrg@...com" <lrg@...com>,
	"broonie@...nsource.wolfsonmicro.com" 
	<broonie@...nsource.wolfsonmicro.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH V1 2/3] Documentation: gpio: Add details of open-drain configuration

On Thu, Feb 16, 2012 at 9:28 AM, Laxman Dewangan <ldewangan@...dia.com> wrote:

> Yes, I can add the open source also but like to be in incremental change.
> Not together with open drain.
> We can go with:
> - open drain core driver support.
> - open drain sysfs interface support
> - open source core driver support
> - open source sysfs interface.
>
> I have already changes for the first 2 which we can review/apply,
> Meanwhile I will work on open source support.
>
> Does it look good?

Well as a patch concept it is OK but I have real bad feelings about
patch  [2/4] and [4/4] adding sysfs.

What the GPIO subsystem really needs is to get rid of sysfs
interfaces, have them deprecated and replaced with a
per-gpiochip /dev/gpioN with ioctl()s or similar instead. The sysfs
interface is just ... it won't scale.

Yours,
Linus Walleij
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