From: David Brownell <david-b@pacbell.net>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Michael Buesch <mb@bu3sch.de>,
linux-kernel@vger.kernel.org, openwrt-devel@lists.openwrt.org
Subject: Re: [PATCH] spi-gpio: Sanitize MISO bitvalue
Date: Wed, 18 Feb 2009 16:29:56 -0800 [thread overview]
Message-ID: <200902181629.57114.david-b@pacbell.net> (raw)
In-Reply-To: <20090218130426.a12e6bfa.akpm@linux-foundation.org>
On Wednesday 18 February 2009, Andrew Morton wrote:
> If this function is speed-critical (which is what David's comment
> implies) then perhaps this should be "fixed" by tightening up the
> (presently apparently undocumented) interface? And then speeding up
> all the other getmiso() implementations?
All the per-bit GPIO functions can be speed-critical,
which is why they use the zero/nonzero convention
instead of demanding extra instructions to switch to
the zero/one convention.
This particular function needs the zero/one convention;
in that respect it's unusual.
prev parent reply other threads:[~2009-02-19 0:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-15 15:30 [PATCH] spi-gpio: Sanitize MISO bitvalue Michael Buesch
2009-02-16 19:58 ` David Brownell
2009-02-18 21:04 ` Andrew Morton
2009-02-18 21:52 ` Michael Buesch
2009-02-19 0:29 ` David Brownell [this message]
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