From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753482AbbD2GGt (ORCPT ); Wed, 29 Apr 2015 02:06:49 -0400 Received: from mail-ob0-f182.google.com ([209.85.214.182]:33893 "EHLO mail-ob0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752064AbbD2GGr (ORCPT ); Wed, 29 Apr 2015 02:06:47 -0400 MIME-Version: 1.0 In-Reply-To: References: <1429522047-16675-1-git-send-email-pi-cheng.chen@linaro.org> <1429522047-16675-2-git-send-email-pi-cheng.chen@linaro.org> <20150423125620.GB29702@leverpostej> Date: Wed, 29 Apr 2015 11:36:46 +0530 Message-ID: Subject: Re: [PATCH 1/2] cpufreq: mediatek: Add MT8173 cpufreq driver From: Viresh Kumar To: Pi-Cheng Chen Cc: Mark Rutland , Mike Turquette , Matthias Brugger , "Joe.C" , Eddie Huang , Howard Chen , "fan.chen@mediatek.com" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-pm@vger.kernel.org" , "linaro-kernel@lists.linaro.org" , "linux-mediatek@lists.infradead.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 24 April 2015 at 12:20, Pi-Cheng Chen wrote: > So even we have a new OPP binding to describe the OPP, we have to > leave these table as they are for backward compatibility? Yes. I could find the below excerpts from [1]: "The compatibility rules say that new kernels must work with older device trees. If changes are required, they should be put into new properties; the old ones can then be deprecated but not removed. New properties should be optional, so that device trees lacking those properties continue to work. The device tree developers will provide a set of guidelines for the creation of future-proof bindings." -- viresh [1] http://lwn.net/Articles/572114/