linux-kernel - Re: [PATCH] pinctrl: qcom: ssbi-gpio: fix gpio-hog related boot issues

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Message-ID: <CACRpkdbdEkegcMMmwAQdAc=_n7vcu5M1KGx9KfgvFKbk4ZQ12Q@mail.gmail.com>
Date:   Fri, 16 Nov 2018 23:14:49 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     masneyb@...tation.org
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: qcom: ssbi-gpio: fix gpio-hog related boot issues

On Sun, Nov 11, 2018 at 2:34 AM Brian Masney <masneyb@...tation.org> wrote:

> When attempting to setup up a gpio hog, device probing will repeatedly
> fail with -EPROBE_DEFERED errors. It is caused by a circular dependency
> between the gpio and pinctrl frameworks. If the gpio-ranges property is
> present in device tree, then the gpio framework will handle the gpio pin
> registration and eliminate the circular dependency.
>
> See Christian Lamparter's commit a86caa9ba5d7 ("pinctrl: msm: fix
> gpio-hog related boot issues") for a detailed commit message that
> explains the issue in much more detail. The code comment in this commit
> came from Christian's commit.
>
> I did not test this change against any hardware supported by this
> particular driver, however I was able to validate this same fix works
> for pinctrl-spmi-gpio.c using a LG Nexus 5 (hammerhead) phone.
>
> Signed-off-by: Brian Masney <masneyb@...tation.org>

Patch applied.

Yours,
Linus Walleij