Re: [PATCH v4 0/9] Making the generic ACPI GSI layer irqdomain aware

From: Rob Herring
Date: Tue Sep 29 2015 - 13:11:53 EST

On Mon, Sep 28, 2015 at 11:42 AM, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
> The irqdomain code is not entierely ACPI friendly, as it has some
> built-in knowledge of the device-tree. Nothing too harmful, but enough
> to scare the ARM ACPI developpers which end up with their own version
> of the square wheel.
> This small patch series adapts the irqdomain code to remove the
> hurdles that prevent the full blown irqdomain subsystem to be used on
> ACPI, creates an interface between the GSI layer and the irqdomain,
> and as an example, convert the ARM GIC ACPI support to use irqdomains
> as originally intended.
> Overall, this gives us a way to use irqdomains on both DT and ACPI
> enabled platforms, having very little changes made to the actual
> drivers (other than the probing infrastructure). Because we keep the
> flow of information between the various layers identical between ACPI
> and DT, we immediately benefit from the existing infrastructure. The
> "convert the GSI information to be DT friendly" is admitedly not very
> pretty, but I see it as a stepping stone towards unifying the two
> structures.

Did I miss v1-v3 or did the DT change just show up? I probably tuned
out with ACPI in the subject.

Needing fake DT nodes for ACPI is just wrong. There's got to be
another, better way.

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