From: Jonathan Cameron <jic23@cam.ac.uk>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: linux-kernel@vger.kernel.org,
Dimitris Papastamos <dp@opensource.wolfsonmicro.com>,
Liam Girdwood <lrg@ti.com>, Samuel Oritz <sameo@linux.intel.com>,
Lars-Peter Clausen <lars@metafoo.de>,
Jean Delvare <khali@linux-fr.org>
Subject: Re: [PATCH 0/8] Generic I2C and SPI register map library
Date: Thu, 23 Jun 2011 09:54:25 +0100 [thread overview]
Message-ID: <4E02FF41.1060000@cam.ac.uk> (raw)
In-Reply-To: <20110623012544.GE20949@opensource.wolfsonmicro.com>
On 06/23/11 02:25, Mark Brown wrote:
> On Thu, Jun 23, 2011 at 12:48:28AM +0200, torbenh wrote:
>
>> you should look at SMBus
>> there seems to be quite some code to share.
>> in particular i2c rtc devices seem to be using SMBus functions
>> to get the exact same semantics you are providing here.
>
> SMBus is an I2C subset with a definition for 8 bit registers layered
> onto it, pretty much.
>
>> I just added support for such a device today, and it struck me, that
>> this API was necessary.
>
> If you're only using SMBus then the I2C interface includes SMBus based
> register support which should do what you want. With the regmap API it
> ought to work as a device with 8 bit registers and 8 bit values.
The kicker here is that quite a few hosts only support the smbus subset.
How should that be handled here?
next prev parent reply other threads:[~2011-06-23 8:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-22 18:44 [PATCH 0/8] Generic I2C and SPI register map library Mark Brown
2011-06-22 18:45 ` [PATCH 1/8] regmap: Add generic non-memory mapped register access API Mark Brown
2011-06-22 18:45 ` [PATCH 2/8] regmap: Add I2C bus support Mark Brown
2011-06-22 18:45 ` [PATCH 3/8] regmap: Add SPI " Mark Brown
2011-06-22 18:45 ` [PATCH 4/8] ASoC: Use new register map API for ASoC generic physical I/O Mark Brown
2011-06-22 18:45 ` [PATCH 5/8] mfd: Convert WM831x to use regmap API Mark Brown
2011-06-22 18:45 ` [PATCH 6/8] mfd: Convert WM8994 to use new register map API Mark Brown
2011-06-22 18:45 ` [PATCH 7/8] mfd: Convert pcf50633 " Mark Brown
2011-06-22 18:45 ` [PATCH 8/8] regulator: Convert tps65023 to use regmap API Mark Brown
2011-06-22 19:03 ` [PATCH 1/8] regmap: Add generic non-memory mapped register access API Lars-Peter Clausen
2011-06-22 19:11 ` Mark Brown
2011-06-22 19:20 ` Lars-Peter Clausen
2011-06-22 19:42 ` Mark Brown
2011-07-01 0:22 ` Ben Hutchings
2011-07-01 2:38 ` Mark Brown
2011-06-22 22:48 ` [PATCH 0/8] Generic I2C and SPI register map library torbenh
2011-06-23 1:25 ` Mark Brown
2011-06-23 8:54 ` Jonathan Cameron [this message]
2011-06-23 10:44 ` Mark Brown
-- strict thread matches above, loose matches on Subject: below --
2011-06-20 12:46 Mark Brown
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