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

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Message-ID: <4F3E2C62.2040708@nvidia.com>
Date:	Fri, 17 Feb 2012 16:00:58 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Linus Walleij <linus.walleij@...aro.org>
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 Friday 17 February 2012 01:30 AM, Linus Walleij wrote:
> 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.
>
Wow, then I will not add 2/4 and 4/4.

> Yours,
> Linus Walleij

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