linux-kernel - Re: [PATCH v1 1/2] pinctrl: tegra: Move drivers registration to arch

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Message-ID: <4576764.PLucfz68jK@dimapc>
Date:   Thu, 02 Aug 2018 16:01:24 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Stefan Agner <stefan@...er.ch>,
        Marcel Ziswiler <marcel@...wiler.com>,
        linux-tegra@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] pinctrl: tegra: Move drivers registration to arch_init level

On Thursday, 2 August 2018 14:11:43 MSK Dmitry Osipenko wrote:
> There is a bug in regards to deferred probing within the drivers core
> that causes GPIO-driver to suspend after its users. The bug appears if

I meant "before its users", of course. If the rest of the patches is fine, 
please let me know if re-sending is needed or you'll correct the comment in 
place while applying.

> GPIO-driver probe is getting deferred, which happens after introducing
> dependency on PINCTRL-driver for the GPIO-driver by defining "gpio-ranges"
> property in device-tree. The bug in the drivers core is old (more than 4
> years now) and is well known, unfortunately there is no easy fix for it.
> The good news is that we can workaround the deferred probe issue by
> changing GPIO / PINCTRL drivers registration order and hence by moving
> PINCTRL driver registration to the arch_init level and GPIO to the
> subsys_init.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>