linux-kernel - Re: linusw/devel bisection: baseline.bootrr.mediatek-mt8173-pinctrl-probed on mt8173-elm-hana

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Date:   Tue, 15 Dec 2020 13:20:34 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "kernelci-results@...ups.io" <kernelci-results@...ups.io>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Johan Hovold <johan@...nel.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Collabora Kernel ML <kernel@...labora.com>,
        Sean Wang <sean.wang@...nel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: linusw/devel bisection: baseline.bootrr.mediatek-mt8173-pinctrl-probed
 on mt8173-elm-hana

On Mon, Dec 14, 2020 at 11:28 PM Guillaume Tucker
<guillaume.tucker@...labora.com> wrote:

> Please see the bisection report below about the pinctrl driver
> failing to probe on the arm64 mt8173-elm-hana platform.

That's an excellent, helpful report which helps a lot!
Thank you for doing this!

> This is the error message:
>
> [    0.051788] gpio gpiochip0: Detected name collision for GPIO name ''
> [    0.051813] gpio gpiochip0: GPIO name collision on the same chip, this is not allowed, fix all lines on the chip to have unique names
> [    0.051832] gpiochip_add_data_with_key: GPIOs 377..511 (1000b000.pinctrl) failed to register, -17
> [    0.051946] mediatek-mt8173-pinctrl: probe of 1000b000.pinctrl failed with error -22

It seems we need to teach the core to ignore the name (empty string).

Yours,
Linus Walleij