From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751731AbeCUIKD (ORCPT ); Wed, 21 Mar 2018 04:10:03 -0400 Received: from mail-db5eur01on0103.outbound.protection.outlook.com ([104.47.2.103]:58688 "EHLO EUR01-DB5-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751597AbeCUIJ6 (ORCPT ); Wed, 21 Mar 2018 04:09:58 -0400 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=peda@axentia.se; Subject: Re: [PATCH 3/3] i2c: mux: pca9541: prepare for PCA9641 support To: Vladimir Zapolskiy , Guenter Roeck , linux-kernel@vger.kernel.org, Ken Chen Cc: Wolfram Sang , joel@jms.id.au, linux-i2c@vger.kernel.org References: <20180320061909.5775-1-chen.kenyy@inventec.com> <20180320093200.19179-1-peda@axentia.se> <20180320093200.19179-4-peda@axentia.se> <3cfc6e53-a86d-8ef1-b83d-9f3c1b3d7b9c@roeck-us.net> <67f0b5fb-5df7-0354-bfd6-5969b6fc7bb1@mleia.com> From: Peter Rosin Organization: Axentia Technologies AB Message-ID: <7ad08be1-fe73-061f-b0ad-e29a4a074506@axentia.se> Date: Wed, 21 Mar 2018 09:09:50 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; 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And do two abstracted (*arbitrate) >>> and (*release_bus) cover it well? Probably no. >>> >>> At first it would be simpler to add a new chip id field into struct pca9541 >>> (struct rename would be needed of course), and do a selection of specific >>> pca9x41_arbitrate() and pca9x41_release_bus() depending on it: >>> >> >> FWIW, I very much prefer Peter's code. I think it is much cleaner. > > Peter's code is generic, and it makes the change about 3 times longer in lines > of code, and the following pca9641 change on top of it will be larger as well, > because generalization requires service. > > My main concern is that if such generalization is really needed in the driver. I just did a comparison of what would happen if I took the same shortcuts you did, and I got 18 new lines and 3 changed lines (and some moved lines that could have been a separate patch). You have 12 new lines and 5 changed lines. So, the big difference is that I add the of_match_device call while you do not. So, it looks like you are comparing apples and oranges. Do you have a reason for not calling of_match_device? Or were you punting that for the patch adding PCA9641 support? That's odd, because the point of the patch is to prepare for smooth addition of that support. Also, I think my code allows adding support for PCA9641 with only new lines, while your version requires changing of code. So, I'm rejecting your arguments that your patch is significantly simpler. And while I'm obviously a tad bit biased, I do agree with Guenter that my structure is cleaner. Cheers, Peter