linux-kernel - Re: [PATCH 0/6] irqchip: Hybrid probing

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Date:   Mon, 14 Sep 2020 13:33:22 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Frank Wunderlich <linux@...web.de>,
        Saravana Kannan <saravanak@...gle.com>,
        Hanks Chen <hanks.chen@...iatek.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH 0/6] irqchip: Hybrid probing

On Sat, Sep 12, 2020 at 5:52 AM Marc Zyngier <maz@...nel.org> wrote:
>
> A recent attempt at converting a couple of interrupt controllers from
> early probing to standard platform drivers have badly failed, as it
> became evident that although an interrupt controller can easily probe
> late, device drivers for the endpoints connected to it are rarely
> equipped to deal with probe deferral. Changes were swiftly reverted.
>
> However, there is some value in *optionally* enabling this, if only
> for development purposes, as there is otherwise a "chicken and egg"
> problem, and a few people (cc'd) are working on a potential solution.
>
> This short series enables the infrastructure for modular building
> whilst retaining the usual early probing for monolithic build, and
> introduces it to the three drivers that were previously made to probe
> as platform drivers.
>
> As I don't have any of the HW, this series is fully untested and I'd
> welcome some feedback on it.

I've tested this on db845c along with a small follow-on patch I'll
send to you which sets the qcom-pdc as a tristate in the Kconfig, both
as a module and as a built-in.

Tested-by: John Stultz <john.stultz@...aro.org>

thanks
-john