linux-kernel - Re: [PATCH] gpio: dwapb: Add support for 32 interrupts

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Message-ID: <CAMuHMdX34f1pDCVqNV43_qtzqZ-fruOcUsUN_Ysz4ihJwe-56A@mail.gmail.com>
Date:   Fri, 6 Apr 2018 11:57:19 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Phil Edworthy <phil.edworthy@...esas.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Hoan Tran <hotran@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michel Pollet <michel.pollet@...renesas.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: dwapb: Add support for 32 interrupts

Hi Phil,

On Thu, Apr 5, 2018 at 11:42 AM, Phil Edworthy
<phil.edworthy@...esas.com> wrote:
> On 30 March 2018 22:26 Andy Shevchenko wrote:
>> On Wed, Mar 28, 2018 at 5:22 PM, Phil Edworthy wrote:
>> > The DesignWare GPIO IP can be configured for either 1 or 32
>> > interrupts,
>>
>> 1 to 32, or just a choice between two?
> Just a choice of 1 or 32.
> Note that by 'configured' I am talking about the hardware being configured in
> RTL prior to manufacturing a device. Once made, you cannot change it.
> This configuration affects the number of output interrupt signals from the GPIO
> Controller block that are connected to an interrupt controller.

Differentiating between different versions of an IP block using DT properties
is usually a bad idea, for several reasons:
  - What if you discover another difference later?
  - You cannot add differentiating properties retroactively, because
of backwards
     compatibility with old DTBS.

Hence I think you should introduce a new compatible value instead.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds