linux-kernel - Re: [RFC PATCH v2 2/3] PCI: hisi: Make the HiSilicon PCIe host controller ECAM compliant

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Date:	Mon, 08 Feb 2016 14:48:18 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Gabriele Paoloni <gabriele.paoloni@...wei.com>,
	guohanjun@...wei.com, wangzhou1@...ilicon.com,
	liudongdong3@...wei.com, linuxarm@...wei.com, qiujiang@...wei.com,
	bhelgaas@...gle.com, Lorenzo.Pieralisi@....com, tn@...ihalf.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	xuwei5@...ilicon.com, linux-acpi@...r.kernel.org, jcm@...hat.com,
	zhangjukuo@...wei.com, liguozhu@...ilicon.com
Subject: Re: [RFC PATCH v2 2/3] PCI: hisi: Make the HiSilicon PCIe host controller ECAM compliant

On Monday 08 February 2016 12:41:03 Gabriele Paoloni wrote:
> From: gabriele paoloni <gabriele.paoloni@...wei.com>
> 
> 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 <gabriele.paoloni@...wei.com>
> Signed-off-by: Dongdong Liu <liudongdong3@...wei.com>
> 

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