linux-kernel - Re: [PATCH] gpio sysfs: add a "toggle" value

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Message-Id: <20090604020501.cdeb8f10.akpm@linux-foundation.org>
Date:	Thu, 4 Jun 2009 02:05:01 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	David Brownell <david-b@...bell.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio sysfs: add a "toggle" value

On Thu, 4 Jun 2009 04:52:35 -0400 Mike Frysinger <vapier.adi@...il.com> wrote:

> my next request was for a 1 letter command set and chaining
> operations.  say you want to toggle a gpio line 4 times, having to go
> between kernel and userspace for that seems kind of heavy.
> echo TTTT > value

I was wondering whether "t" would be better than "toggle".

If you're going to do that, wouldn't you need a "d"(elay) too?  To
prevent large variations in interval between different platforms.  1
millisec, perhaps.

0d1dd0d1ddd0d1, too.

This could be fun.
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