linux-kernel - Re: [PATCH 5/7] regmap: Check if a register is writable instead of readable in regcache

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Message-ID: <20111116171213.GR29986@opensource.wolfsonmicro.com>
Date:	Wed, 16 Nov 2011 17:12:13 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	device-drivers-devel@...ckfin.uclinux.org, drivers@...log.com
Subject: Re: [PATCH 5/7] regmap: Check if a register is writable instead of
 readable in regcache_read

On Wed, Nov 16, 2011 at 06:09:06PM +0100, Lars-Peter Clausen wrote:
> On 11/16/2011 05:56 PM, Mark Brown wrote:

> > No, really - just do something legible and robust.  For example, teach
> > regmap_readable() about the cache.

> Doesn't make much sense. We call regmap_readable from regcache_read, which
> is only called if we use a cache. So if we let regmap_readable return true
> in case we use a cache it will always be true in regcache_read and we can
> drop the check entirely.

We should at least check that we actually have a cached value there -
the cache is sparse after all.
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