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    SubjectRe: [RFC PATCH v2 2/3] PCI: hisi: Make the HiSilicon PCIe host controller ECAM compliant
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    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

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