linux-kernel - Re: [PATCH] clk: imx8mp: register driver at arch

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Message-ID: <08df1f08-1eea-0ee5-8e7b-6c427aa11d02@rasmusvillemoes.dk>
Date:   Mon, 7 Nov 2022 14:54:04 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Abel Vesa <abelvesa@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH] clk: imx8mp: register driver at arch_initcall time

On 28/09/2022 14.41, Rasmus Villemoes wrote:
> We have an imx8mp-based board with an external gpio-triggered
> watchdog. Currently, we don't get to handle that in time before it
> resets the board.
> 
> The probe of the watchdog device gets deferred because the SOC's GPIO
> controller is not yet ready, and the probe of that in turn gets deferred
> because its clock provider (namely, this driver) is not yet
> ready. Altogether, the watchdog does not get handled until the late
> initcall deferred_probe_initcall has made sure all leftover devices
> have been probed, and that's way too late.
> 
> Aside from being necessary for our board, this also reduces total boot
> time because fewer device probes get deferred.

Please advise on what I need to do in order to make progress here.

Thanks,
Rasmus