From: Lars-Peter Clausen <lars@metafoo.de>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>,
Jonathan Cameron <jic23@kernel.org>,
Michael Hennerich <michael.hennerich@analog.com>,
linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
device-drivers-devel@blackfin.uclinux.org, drivers@analog.com
Subject: Re: [PATCH 5/7] regmap: Check if a register is writable instead of readable in regcache_read
Date: Wed, 16 Nov 2011 18:15:31 +0100 [thread overview]
Message-ID: <4EC3EFB3.9080205@metafoo.de> (raw)
In-Reply-To: <20111116171213.GR29986@opensource.wolfsonmicro.com>
On 11/16/2011 06:12 PM, Mark Brown wrote:
> 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.
That's what the cache already does today, you recently change the rbtree
implementation to return -ENOENT if there is no cached value.
next prev parent reply other threads:[~2011-11-16 17:15 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-16 15:28 [PATCH 1/7] regmap: Move initialization of regcache related fields to regcache_init Lars-Peter Clausen
2011-11-16 15:28 ` [PATCH 2/7] regmap: Make reg_config reg_defaults const Lars-Peter Clausen
2011-11-16 16:13 ` Mark Brown
2011-11-16 16:23 ` Lars-Peter Clausen
2011-11-16 16:24 ` Mark Brown
2011-11-16 16:36 ` Lars-Peter Clausen
2011-11-16 16:39 ` Mark Brown
2011-11-16 16:50 ` Lars-Peter Clausen
2011-11-16 16:51 ` Mark Brown
2011-11-16 17:01 ` Lars-Peter Clausen
2011-11-16 17:09 ` Mark Brown
2011-11-16 17:20 ` Lars-Peter Clausen
2011-11-16 17:26 ` Mark Brown
2011-11-16 17:35 ` Mark Brown
2011-11-16 15:28 ` [PATCH 3/7] regmap: Properly round cache_word_size Lars-Peter Clausen
2011-11-16 16:14 ` Mark Brown
2011-11-16 16:25 ` Lars-Peter Clausen
2011-11-16 15:28 ` [PATCH 4/7] regmap: Try cached read before checking if a hardware read is possible Lars-Peter Clausen
2011-11-16 17:35 ` Mark Brown
2011-11-16 15:28 ` [PATCH 5/7] regmap: Check if a register is writable instead of readable in regcache_read Lars-Peter Clausen
2011-11-16 16:16 ` Mark Brown
2011-11-16 16:34 ` Lars-Peter Clausen
2011-11-16 16:38 ` Mark Brown
2011-11-16 16:52 ` Lars-Peter Clausen
2011-11-16 16:56 ` Mark Brown
2011-11-16 17:09 ` Lars-Peter Clausen
2011-11-16 17:12 ` Mark Brown
2011-11-16 17:15 ` Lars-Peter Clausen [this message]
2011-11-16 17:22 ` Mark Brown
2011-11-16 15:28 ` [PATCH 6/7] regmap: Add support for 10/14 register formating Lars-Peter Clausen
2011-11-16 17:37 ` Mark Brown
2011-11-16 15:28 ` [PATCH 7/7] staging:iio:dac: Add AD5380 driver Lars-Peter Clausen
2011-11-16 16:56 ` Lars-Peter Clausen
2011-11-17 20:24 ` Jonathan Cameron
2011-11-18 9:08 ` Lars-Peter Clausen
2011-11-18 9:51 ` J.I. Cameron
2011-11-16 17:35 ` [PATCH 1/7] regmap: Move initialization of regcache related fields to regcache_init Mark Brown
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