linux-kernel - Re: [PATCH v4 03/10] of/irq: document properties for wakeup interrupt parent

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Date:   Wed, 17 Apr 2019 16:36:36 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Lina Iyer <ilina@...eaurora.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Evan Green <evgreen@...omium.org>,
        Marc Zyngier <marc.zyngier@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        rplsssn@...eaurora.org, linux-arm-msm@...r.kernel.org,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Doug Anderson <dianders@...omium.org>
Subject: Re: [PATCH v4 03/10] of/irq: document properties for wakeup interrupt parent

On Wed, Mar 13, 2019 at 10:19 PM Lina Iyer <ilina@...eaurora.org> wrote:

> +Mapping the interrupt specifiers in the device tree can be done using the
> +"irqdomain-map" property. The property contains interrupt specifier at the
> +current interrupt controller followed by the interrupt specifier at the mapped
> +interrupt controller.
> +
> +   irqdomain-map = <incoming-interrupt-specifier mapped-interrupt-specifier>
> +
> +The optional properties "irqdomain-map-mask" and "irqdomain-map-pass-thru" may
> +be provided to help interpret the valid bits of the incoming and mapped
> +interrupt specifiers respectively.
> +
> +   Example:
> +       irqdomain-map = <22 0 &intc 36 0>, <24 0 &intc 37 0>;
> +       irqdomain-map-mask = <0xff 0>;
> +       irqdomain-map-pass-thru = <0 0xff>;

This is looking a bit familiar to the existing interrupt-map that is
used for PCI interrupts and Swizzling back to a set of PCI
host interrupts.

I tried to document interrupt-map here:
https://elinux.org/Device_Tree_Usage#Advanced_Interrupt_Mapping

interrupt-map is a bit convoluted, so I don't know if it would be subject
to reuse for this. I suspect that interrupt-map, despite the name,
is for PCI only.

Yours,
Linus Walleij