From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752830AbcBHNtJ (ORCPT ); Mon, 8 Feb 2016 08:49:09 -0500 Received: from mout.kundenserver.de ([212.227.126.187]:65454 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751245AbcBHNtF (ORCPT ); Mon, 8 Feb 2016 08:49:05 -0500 From: Arnd Bergmann To: linux-arm-kernel@lists.infradead.org Cc: Gabriele Paoloni , guohanjun@huawei.com, wangzhou1@hisilicon.com, liudongdong3@huawei.com, linuxarm@huawei.com, qiujiang@huawei.com, bhelgaas@google.com, Lorenzo.Pieralisi@arm.com, tn@semihalf.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, xuwei5@hisilicon.com, linux-acpi@vger.kernel.org, jcm@redhat.com, zhangjukuo@huawei.com, liguozhu@hisilicon.com Subject: Re: [RFC PATCH v2 2/3] PCI: hisi: Make the HiSilicon PCIe host controller ECAM compliant Date: Mon, 08 Feb 2016 14:48:18 +0100 Message-ID: <3532826.pJr5R5Xa4c@wuerfel> User-Agent: KMail/4.11.5 (Linux/3.16.0-10-generic; KDE/4.11.5; x86_64; ; ) In-Reply-To: <1454935264-6076-3-git-send-email-gabriele.paoloni@huawei.com> References: <1454935264-6076-1-git-send-email-gabriele.paoloni@huawei.com> <1454935264-6076-3-git-send-email-gabriele.paoloni@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Provags-ID: V03:K0:LV1FSikGsl5ZGPqSc3l0Rb2VxgSti03YHh5WIHIgVTFaW06G+Tv NugCKFiLH3tIhRdjoxHgtcSGBGpesqlLPPk2Cb2PIHUjTdusGZVKYLTMGcGybwj7FmgCeHS oJMC7nHunAcd17/bqUUcDGw/ti0mzv9v3rQGiXVu2ehHuThm4GprjATRa4Z2AvQpVmNmMLJ jscjIhnQLDfoZ87k3bwDg== X-UI-Out-Filterresults: notjunk:1;V01:K0:K18l6j9fIWo=:hCxWARMK95Q/YGrB0MClHw ylxQ5Ku+bfN1gcff4d4IADj5doWtntVKR1m6cadaYSfw74nIpWL8suDVu1Yfel8QXs9FZTzYS rybwU0vEun9aD1VMJq+dJpONlOJsuVwVQ0kBSmQ7PmN/nVs0alyhV3hku8x0CUx5n+4OsMr+T tmkLzp7D8B0aZZ22mLUtabJdVmX72FW/aWxRdIApqmtUldDveB5yq6PBOsetsz0LVg99J6+Sz RpLWCVZcLqDUhow6rUu/n3h1SRBz4zE2nr4ZoX+yUknghiRKuxpEvus9HfgsmT1IJ266s3F7k uBZW2Hci2W3MZOlqwekgQ0riA2lawM91Mft2ck76hs584CPITAjuI+5QSph1HT8pSGIGkfDdY aEzQVEerzvk4U4w/KRUOk4RVWX5iYfAcdWT6fHN0sz9jVWr05stmJLGwzN7Sybgzv9yPBKSIS vcxY0bdfEkqjyC6GioeUh/8bW1xH9Yk6xrMFho+wIZ9tC9kI9nFHnVyThMwPy/z+2u92S2BEH ohqSC4U8l/Y4/IjOsh7NE4A8uVqnOZdF8PGp45Fc4qcfb8frmmpXk+U+baE42NzNgnIKKTVZ9 knMhwut9YlvxAnt+vJJYGasyKstrdq961IASEAfmCIF83zhjY7+xoPFwSsjOAmV92sYKFmREW REQuRWtD6qPH3ADv9rssDC1wjOnLkm6T0MTS29cL4/7s2eUhV4XGVCH3vEHUUTyJzwZpo8B9F cy0OW3z6e9VHrRid Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday 08 February 2016 12:41:03 Gabriele Paoloni wrote: > From: gabriele paoloni > > This patch modifies the current Hip05/Hip06 PCIe host controller > driver to make it ECAM compliant. This is needed in preparation > for the ACPI based driver to allow both DT and ACPI drivers to > use the same BIOS (that configure the Designware iATUs). > > Signed-off-by: Gabriele Paoloni > Signed-off-by: Dongdong Liu > Doesn't this break backwards compatibility? I think you need to use a new compatible string in the firmware if you change the register layout, and then change the driver to support both the old and the new layout. Arnd