linux-kernel - Re: [PATCH v3 2/3] ARM: dts: add ngpios for vf610 compatible gpio controllers

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Message-ID: <81fd4ffd-5f1d-47fa-a50c-e0643ee2787e@gmx.net>
Date: Wed, 21 May 2025 10:40:03 +0200
From: Stefan Wahren <wahrenst@....net>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Haibo Chen <haibo.chen@....com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Stefan Agner <stefan@...er.ch>,
 Bartosz Golaszewski <brgl@...ev.pl>, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, peng.fan@....com,
 conor@...nel.org, Frank Li <Frank.Li@....com>
Subject: Re: [PATCH v3 2/3] ARM: dts: add ngpios for vf610 compatible gpio
 controllers

Am 21.05.25 um 00:14 schrieb Linus Walleij:
> On Tue, May 20, 2025 at 12:54 PM Stefan Wahren <wahrenst@....net> wrote:
>
>> sorry for asking this dumb question: why do we need the redundant ngpio
>> property in case there is already gpio-ranges defined? AFAIU the last
>> cell already contains the necessary information. Or do I missed something?
> Not all GPIOs on a gpio controller have to be present in
> a range.
>
> The ranges can be multiple and have holes in them.
>
> The ranges are also optional.
>
> The fact that this DTS file, for this SoC and on this controller
> happens to have a range mapped right over all of the pins
> is merely a coinicidence and not a general rule of any kind,
> it just apophenia playing games on us.
Thanks for clarification
>
> Yours,
> Linus Walleij
>