linux-kernel - Re: [PATCH v9 00/22] pinctrl: add BCM63XX pincontrol support

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Date:   Thu, 8 Apr 2021 15:55:58 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Álvaro Fernández Rojas <noltari@...il.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Michael Walle <michael@...le.cc>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Jonas Gorski <jonas.gorski@...il.com>,
        Necip Fazil Yildiran <fazilyildiran@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 00/22] pinctrl: add BCM63XX pincontrol support

On Tue, Mar 30, 2021 at 10:57 AM Álvaro Fernández Rojas
<noltari@...il.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 appreciated, because your comments [1] are now outdated since I switched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 hierarchical.
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