linux-kernel - Re: [PATCH v3 4/5] gpio: gpiolib: Add ngirq member to struct gpio_irq

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Message-ID: <CACRpkda9xiPMa6BBXUNsoJ7SQ9N6t=K422bh0Dh4HUBnotVYxg@mail.gmail.com>
Date:   Thu, 19 May 2022 15:21:10 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v3 4/5] gpio: gpiolib: Add ngirq member to struct gpio_irq_chip

On Wed, May 18, 2022 at 8:36 PM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:

> > As Geert says, I think you can just use .valid_mask for this,
> > what do you say?
> >
> I don't think Geert is suggesting that. The .valid_mask option is one
> time setting but what I need is something dynamic i.e. out of 392 GPIO
> pins any 32 can be used as an interrupt pin.

So why can't this just be determined from the compatible?
This does not sound like a configuration option at all but something
related to the IP block per se, and then you know that if it has
a certain compatible then it has this property.

Yours,
Linus Walleij