From: Jonathan Cameron <jic23@cam.ac.uk>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Hennerich, Michael" <Michael.Hennerich@analog.com>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>
Subject: Re: Blockers on IIO usage of regmap.
Date: Wed, 07 Sep 2011 19:12:37 +0100 [thread overview]
Message-ID: <4E67B415.6000106@cam.ac.uk> (raw)
In-Reply-To: <20110907175756.GH2906@opensource.wolfsonmicro.com>
On 09/07/11 18:57, Mark Brown wrote:
> On Wed, Sep 07, 2011 at 05:10:24PM +0100, Jonathan Cameron wrote:
>
> Please fix your mailer to word wrap at less than 80 colums, they're
> really quite hard to read as a result of this.
>
>> CS -_______________________-
>> TX Ada0...Ada7 Da0....Da7
>> RX XXXXXXXXXXXXXXXXXXXXXXXXX
>>
>> Reads are 16 bit with either of the two 8 bit register addresses given the same value
>>
>> CS -______________________-_____________________-
>> TX Ada0....Ada7 XXXXXXXX
>> RX XXXXXXXXXXXXXXXXXXXXX Da0...Da7 Db0....Db7
>
>> Can interpret Da0...Da7 and Db0....Db7 as single 16 bit register and consider this device
>> to just have a weird write method and normal read. Might be easier. I'll define Ax<n> as
>> 16 bit address for the burst read.
>
> This is starting to seem pretty far off the reservation.
Indeed.
>
>> Perhaps the burst mode thing is better handled by just providing a hook to allow data to be pushed
>> into regmap (from 'magic' sources), but the weird write read combination looks to me like something
>> that makes sense to have in regmap (be it as another bus variant).
>
> Probably not as a bus, it sounds like a marshalling difference rather
> than a bus - the buses should really only understand byte streams. I
> don't have any bright ideas on how to deal with this, it's fairly far
> away from the problem space I'm worried about.
The right answer maybe that it isn't a good idea to do it at all, but it
wasn't obvious until I tried! Having done it I'm not sure either way.
> --
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>
prev parent reply other threads:[~2011-09-07 18:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4E6600A8.4020101@cam.ac.uk>
[not found] ` <20110906175435.GA2924@opensource.wolfsonmicro.com>
[not found] ` <Prayer.1.3.4.1109062213100.4243@hermes-2.csi.cam.ac.uk>
2011-09-07 16:10 ` Blockers on IIO usage of regmap Jonathan Cameron
2011-09-07 16:19 ` [RFC PATCH 0/6] Using regmap with ADIS devices Jonathan Cameron
2011-09-07 16:19 ` [PATCH 1/6] SPI: add ability to say we want a cs change after every transfer Jonathan Cameron
2011-09-07 17:35 ` Mark Brown
2011-09-07 18:14 ` Jonathan Cameron
2011-09-07 18:12 ` Mark Brown
2011-09-07 18:28 ` Jonathan Cameron
2011-09-07 16:19 ` [PATCH 2/6] regmap: Add a magic bus type to handle quirks of analog devices ADIS sensors Jonathan Cameron
2011-09-07 17:47 ` Mark Brown
2011-09-07 18:26 ` Jonathan Cameron
2011-09-07 18:32 ` Mark Brown
2011-09-07 18:50 ` Jonathan Cameron
2011-09-07 18:44 ` Mark Brown
2011-09-07 19:14 ` Jonathan Cameron
2011-09-07 16:19 ` [PATCH 3/6] staging:iio:imu: adis16400 partial conversion to regmap Jonathan Cameron
2011-09-07 16:23 ` Jonathan Cameron
2011-09-07 16:19 ` [PATCH 4/6] regmap-spi-adi + staging:iio:imu:adis16400 halve register addresses Jonathan Cameron
2011-09-07 16:19 ` [PATCH 5/6] regmap-spi-adi generalize regmap_spi_read Jonathan Cameron
2011-09-07 16:19 ` [PATCH 6/6] staging:iio:imu:adis16400 make use of regmap bulk read capabilities Jonathan Cameron
2011-09-07 17:57 ` Blockers on IIO usage of regmap Mark Brown
2011-09-07 18:12 ` Jonathan Cameron [this message]
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