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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Thu, 8 Apr 2021 15:55:58 +0200
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Subject: Re: [PATCH v9 00/22] pinctrl: add BCM63XX pincontrol support
To:     =?UTF-8?B?w4FsdmFybyBGZXJuw6FuZGV6IFJvamFz?= <noltari@gmail.com>
Cc:     Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>,
        Lee Jones <lee.jones@linaro.org>,
        Michael Walle <michael@walle.cc>,
        Florian Fainelli <f.fainelli@gmail.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
        Jonas Gorski <jonas.gorski@gmail.com>,
        Necip Fazil Yildiran <fazilyildiran@gmail.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
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On Tue, Mar 30, 2021 at 10:57 AM =C3=81lvaro Fern=C3=A1ndez Rojas
<noltari@gmail.com> wrote:

> > Now, what about a patch set for the IRQ support? :)
>
> If you could give me some guidance on that matter it would be much
> appreciated, because your comments [1] are now outdated since I switched
> to GPIO_REGMAP
> [1]
> http://patchwork.ozlabs.org/project/linux-gpio/patch/20210225164216.21124=
-3-noltari@gmail.com/

I think it mostly holds: GPIOLIB_IRQCHIP should always be used if there
is a reasonably straight-forward interrupts whether cascaded or hierarchica=
l.
Very few exceptions there. If there is one IRQ line per GPIO
line, the hierarchical support should be used as outlined. GPIO_REGMAP
should be mostly (famous last words) orthogonal.

Yours,
Linus Walleij