From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laxman Dewangan Subject: Re: [PATCH V1 1/2] mfd: tps65910: use regmap for device register access. Date: Thu, 9 Feb 2012 17:29:38 +0530 Message-ID: <4F33B52A.5020900@nvidia.com> References: <1328697985-22504-1-git-send-email-ldewangan@nvidia.com> <20120208114120.GF3120@opensource.wolfsonmicro.com> <4F32676F.1010305@nvidia.com> <20120208130726.GB5943@opensource.wolfsonmicro.com> <4F3279D6.4000009@nvidia.com> <20120208135816.GE5943@opensource.wolfsonmicro.com> <4F335385.5040400@nvidia.com> <20120209115502.GD3058@opensource.wolfsonmicro.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120209115502.GD3058-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Mark Brown Cc: "sameo-VuQAYsv1563Yd54FQh9/CA@public.gmane.org" , "lrg-l0cyMroinI0@public.gmane.org" , "jedu-kDsPt+C1G03kYMGBc/C6ZA@public.gmane.org" , "gg-kDsPt+C1G03kYMGBc/C6ZA@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-tegra@vger.kernel.org On Thursday 09 February 2012 05:25 PM, Mark Brown wrote: > * PGP Signed by an unknown key > > On Thu, Feb 09, 2012 at 10:33:01AM +0530, Laxman Dewangan wrote: >> On Wednesday 08 February 2012 07:28 PM, Mark Brown wrote: >>> But that's just raw_write(), there's no benefit to the additional API >>> call. >> raw_write supported for the volatile register only. > > Note that there's a very important difference between the bulk and raw > versions of the API which you're not taking into account: the bulk > version takes care of endianness differences between the device and the > host. This would mean that for send we'd need to rewrite the input > array which means we have to take a copy of the data as we probably > shouldn't be changing the input data. > Yes, I am taking care of this. Probably my code will explain this :) I have my patch ready. Let me send this.. > Indeed, looking at the drivers in mainline I can't actually see any of > them which do block writes. > I am working on mfd/tps65910.c and function is: static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg, int bytes, void *src) All your feedback will help me to improve my next two mfd/pmic drivers which I am planning to upstream... > * Unknown Key > * 0x6E30FDDD