linux-kernel - Re: [PATCH 1/3] pinctrl: cix: Add pin-controller support for sky1

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Message-ID: <CACRpkda+iUfHKFnnsTGmXrvxpPSy7WTQRKaAu=YgXtcrsjXthA@mail.gmail.com>
Date: Thu, 28 Aug 2025 23:03:26 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Gary Yang <gary.yang@...tech.com>, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, cix-kernel-upstream@...tech.com
Subject: Re: [PATCH 1/3] pinctrl: cix: Add pin-controller support for sky1

On Thu, Aug 28, 2025 at 8:02 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:

> > If you see that the "hello world" from that driver is missing, you know it
> > isn't probing, instead of finding it out after combing through the .config
> > for the third time.
>
> Any tests for driver success should be checking in sysfs, not in dmesg.
> Most of platforms have smaller or bigger tests for that.

Yeah I understand the thinking.

The typical symptom of a non-probed pin control driver is however
eg that the system does not mount root because some pins
connected to the eMMC are not muxed right.

People find the problem sooner or later anyway, it's just that the
print makes it sooner. And the mistake is pretty common (or
at least for me, but I'm not the best developer...)

Yours,
Linus Walleij