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

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Message-ID: <4F3CBE3F.1090604@nvidia.com>
Date:	Thu, 16 Feb 2012 13:58:47 +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 Thursday 16 February 2012 03:55 AM, Linus Walleij wrote:
>> Have you though about support for lines that are pulled low instead of
>> high?  Those aren't as common, but it is conceivable that some
>> hardware would need it.
> So if the idea is (if I get it correctly) that this thing is an input
> sometimes and open drain/collector output sometimes, then
> open source/emitter for the inverse situation is an equally valid
> case right? In that case I think it'd be best to add both.
>
> The COH901 driver for U300 supports open source/emitter
> BTW.
>

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?

> Yours,
> Linus Walleij

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