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From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Gabriele Paoloni <gabriele.paoloni@huawei.com>,
	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	[thread overview]
Message-ID: <3532826.pJr5R5Xa4c@wuerfel> (raw)
In-Reply-To: <1454935264-6076-3-git-send-email-gabriele.paoloni@huawei.com>

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

WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH v2 2/3] PCI: hisi: Make the HiSilicon PCIe host controller ECAM compliant
Date: Mon, 08 Feb 2016 14:48:18 +0100	[thread overview]
Message-ID: <3532826.pJr5R5Xa4c@wuerfel> (raw)
In-Reply-To: <1454935264-6076-3-git-send-email-gabriele.paoloni@huawei.com>

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

  reply	other threads:[~2016-02-08 13:48 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-08 12:41 [RFC PATCH v2 0/3] Add ACPI support for HiSilicon PCIe Host Controllers Gabriele Paoloni
2016-02-08 12:41 ` Gabriele Paoloni
2016-02-08 12:41 ` Gabriele Paoloni
2016-02-08 12:41 ` [RFC PATCH v2 1/3] PCI: hisi: re-architect Hip05/Hip06 controllers driver to preapare for ACPI Gabriele Paoloni
2016-02-08 12:41   ` Gabriele Paoloni
2016-02-08 12:41   ` Gabriele Paoloni
2016-02-08 13:50   ` Arnd Bergmann
2016-02-08 13:50     ` Arnd Bergmann
2016-02-08 16:06     ` Gabriele Paoloni
2016-02-08 16:06       ` Gabriele Paoloni
2016-02-08 16:06       ` Gabriele Paoloni
2016-02-08 16:32       ` Arnd Bergmann
2016-02-08 16:32         ` Arnd Bergmann
2016-02-08 16:32         ` Arnd Bergmann
2016-02-08 16:51         ` Gabriele Paoloni
2016-02-08 16:51           ` Gabriele Paoloni
2016-02-08 16:51           ` Gabriele Paoloni
2016-02-09 16:27           ` Arnd Bergmann
2016-02-09 16:27             ` Arnd Bergmann
2016-02-09 16:27             ` Arnd Bergmann
2016-02-09 16:52             ` Gabriele Paoloni
2016-02-09 16:52               ` Gabriele Paoloni
2016-02-09 16:52               ` Gabriele Paoloni
2016-02-08 12:41 ` [RFC PATCH v2 2/3] PCI: hisi: Make the HiSilicon PCIe host controller ECAM compliant Gabriele Paoloni
2016-02-08 12:41   ` Gabriele Paoloni
2016-02-08 12:41   ` Gabriele Paoloni
2016-02-08 13:48   ` Arnd Bergmann [this message]
2016-02-08 13:48     ` Arnd Bergmann
2016-02-08 15:55     ` Gabriele Paoloni
2016-02-08 15:55       ` Gabriele Paoloni
2016-02-08 15:55       ` Gabriele Paoloni
2016-02-08 16:29       ` Arnd Bergmann
2016-02-08 16:29         ` Arnd Bergmann
2016-02-08 16:29         ` Arnd Bergmann
2016-02-08 16:29         ` Arnd Bergmann
2016-02-08 17:21         ` Gabriele Paoloni
2016-02-08 17:21           ` Gabriele Paoloni
2016-02-08 17:21           ` Gabriele Paoloni
2016-02-09 15:32           ` Arnd Bergmann
2016-02-09 15:32             ` Arnd Bergmann
2016-02-09 15:56             ` Gabriele Paoloni
2016-02-09 15:56               ` Gabriele Paoloni
2016-02-09 15:56               ` Gabriele Paoloni
2016-02-08 12:41 ` [RFC PATCH v2 3/3] PCI/ACPI: hisi: Add ACPI support for HiSilicon SoCs Host Controllers Gabriele Paoloni
2016-02-08 12:41   ` Gabriele Paoloni
2016-02-08 12:41   ` Gabriele Paoloni

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