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    SubjectRe: [PATCH 2/2] drivers/amba: probe via device tree
    On Mon, May 23, 2011 at 3:58 AM, Russell King - ARM Linux
    <> wrote:
    > On Mon, May 23, 2011 at 11:37:04AM +0200, Kristoffer Glembo wrote:
    >> Grant Likely wrote:
    >> > In the case we're talking about the bus really is an AMBA bus, and all
    >> > the devices on it are in some sense real amba devices.  The problem is
    >> > that not all of the devices on the bus implement peripheral ID
    >> > registers or other mechanisms that good upstanding AMBA devices are
    >> > expected to have.
    >> Before we go hardware bashing of non primecell AMBA devices I would just
    >> want to point out that the primecell stuff is not part of the AMBA
    >> specification.
    > And before we go down that route, let me point out that the 'amba bus'
    > stuff in the kernel is there to support primecells, rather than all
    > devices which the AMBA specification covers.
    > The reason it's called 'amba' is because back in 2001 or so when the
    > first primecell drivers were created, there was little information
    > available as to what AMBA, AHB, or APB even covered.  All I had to go
    > on were the primecell documents themselves.  The higher level documents
    > were not available to me.
    > So, despite it being called 'amba', it really is just for primecells
    > and if we didn't have the exposure to userspace, I'd have renamed it to
    > 'apb' or similar instead.

    Okay, that clarifies things a lot, and lends weight to the arguement
    that it is perfectly normal and acceptable to have both amba_devices
    and platform_devices on the same bus segment. Are there any cases
    where amba primecells are being driven by platform_drivers? If so,
    should those drivers have an amba_driver registration added?

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