linux-kernel - Re: Default async probing for DT based systems

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Message-ID: <CACRpkdb1-F1CP0AAbS5FHoDRFdX-bS2m0NOfQm9nVcery+cW4Q@mail.gmail.com>
Date:   Sat, 25 Jun 2022 20:09:39 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kevin Hilman <khilman@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: Default async probing for DT based systems

On Fri, Jun 17, 2022 at 8:01 PM Saravana Kannan <saravanak@...gle.com> wrote:
> On Fri, Jun 17, 2022 at 1:21 AM Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Thu, Jun 16, 2022 at 5:25 AM Saravana Kannan <saravanak@...gle.com> wrote:
> >
> > > Since fw_devlink=on is the default behavior and fw_devlink understands
> > > approximately 24 DT bindings,
> >
> > How can I see which these are, in the kernel tree?
>
> device/of/property.c has an array of these binding handling functions
> in of_supplier_bindings[].
>
> Most of the functions there are created using DEFINE_SIMPLE_PROP() or
> DEFINE_SUFFIX_PROP() that's also in the same file.

Thanks!

We already have some device links in pin control, it's an opt-in for
drivers, used e.g in drivers/pinctrl/stm32/pinctrl-stm32.c
where you see
pctl->pctl_desc.link_consumers = true;
how does that
play with this? Double device links at different levels?

I had a patch to just enforce device links on all pinctrl resources,
but it seemed over the top:
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/commit/?h=consumer-link-enforce&id=73441cf773ed91bff0e7f66614d391b2514188bf

Yours,
Linus Walleij