From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from opensource.wolfsonmicro.com ([80.75.67.52]:36737 "EHLO opensource2.wolfsonmicro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755712Ab1IGR6D (ORCPT ); Wed, 7 Sep 2011 13:58:03 -0400 Date: Wed, 7 Sep 2011 10:57:56 -0700 From: Mark Brown To: Jonathan Cameron Cc: LKML , "Hennerich, Michael" , "linux-iio@vger.kernel.org" Subject: Re: Blockers on IIO usage of regmap. Message-ID: <20110907175756.GH2906@opensource.wolfsonmicro.com> References: <4E6600A8.4020101@cam.ac.uk> <20110906175435.GA2924@opensource.wolfsonmicro.com> <4E679770.4090008@cam.ac.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <4E679770.4090008@cam.ac.uk> Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org 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 as > 16 bit address for the burst read. This is starting to seem pretty far off the reservation. > 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.