linux-kernel - Re: [RFC PATCH 0/3] introduce: Multistate Switch Class

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Date:	Thu, 1 Dec 2011 14:38:06 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	NeilBrown <neilb@...e.de>, Grant Likely <grant.likely@...retlab.ca>
Cc:	Greg KH <gregkh@...e.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Arnd Bergmann <arnd@...db.de>, myungjoo.ham@...il.com,
	linux-kernel@...r.kernel.org, Mike Lockwood <lockwood@...roid.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Donggeun Kim <dg77.kim@...sung.com>,
	Kalle Komierowski <karl.komierowski@...ricsson.com>,
	Johan PALSSON <johan.palsson@...ricsson.com>,
	Daniel WILLERUD <daniel.willerud@...ricsson.com>
Subject: Re: [RFC PATCH 0/3] introduce: Multistate Switch Class

On Thu, Dec 1, 2011 at 12:04 AM, NeilBrown <neilb@...e.de> wrote:

> So: do you know what specific concerns have been expressed concerning gpio
> and userspace?  I think it best to address specific concern rather than throw
> it all out and start again.

No but I have these generic statements from Grant, so it's a bit like the
Delphic oracle giving some advice of the type "don't go there":

[Grant Likely about pinctrl:]
>> https://lkml.org/lkml/2011/9/30/260
>> I'm not convinced that the sysfs approach is
>> actually the right interface here (I'm certainly not a fan of the gpio
>> sysfs i/f), and I'd rather not be putting in unneeded stuff until the
>> userspace i/f is hammered out.
(...)
>> https://lkml.org/lkml/2011/10/4/366
>> I don't want to be in the situation we are now with GPIO,
>> where every time I look at the sysfs interface I shudder.

I am sure he will be able to expand on this when he
gets back on monday.

Yours,
Linus Walleij
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