linux-kernel - Re: [PATCH/RFC] drivers/irqchip: add irq-inverter

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Message-ID: <87ee5uz8hk.wl-maz@kernel.org>
Date:   Thu, 30 Dec 2021 10:34:47 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Nikita Yushchenko <nikita.yoush@...entembedded.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC] drivers/irqchip: add irq-inverter

On Wed, 29 Dec 2021 19:52:18 +0000,
Nikita Yushchenko <nikita.yoush@...entembedded.com> wrote:
> 
> Hi
> 
> >>> The right way to do it is to use the existing API by exposing the
> >>> inverter (there are existing examples in the tree, using the
> >>> hierarchical model)...
> >
> > A much simpler version can be written in a few minutes, see below...
> 
> Can something like that be used if the parent domain is not
> hierarchical (i.e. does not provide alloc(), but provides map()
> instead)?

No. This definitely relies on the parent being hierarchical, as that's
exactly what it was designed for the first place.

> In particular, gpio-rcar currently provides irq domain that is not
> hierarchical.  As well as quite a few other gpiochips.

Well, you just found yourself some useful work! ;-)

	M.

-- 
Without deviation from the norm, progress is not possible.