linux-kernel - Re: [PATCH v6 04/22] of: add function to allow probing a device from a OF node

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Message-ID: <CAMuHMdW=sT9uLbZkwdYF9Yd3ENaAoQ0=qQLfr-Ow6pz11DiU0A@mail.gmail.com>
Date:	Mon, 26 Oct 2015 09:16:48 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Rob Herring <robh+dt@...nel.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Mark Brown <broonie@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 04/22] of: add function to allow probing a device from
 a OF node

On Mon, Sep 21, 2015 at 4:02 PM, Tomeu Vizoso
<tomeu.vizoso@...labora.com> wrote:
> Walks the OF tree up and finds the closest ancestor that has a struct
> device associated with it, probing it if isn't bound to a driver yet.
>
> The above should ensure that the dependency represented by the passed OF
> node is available, because probing a device should cause its descendants
> to be probed as well (when they get registered).
>
> Subsystems can use this when looking up resources for drivers, to reduce
> the chances of deferred probes because of the probing order of devices.
>
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>

Don't know to which response I should post this comment, so I'm responding
to the original email.

Some subsystems already do this.
If you call e.g. syscon_regmap_lookup_by_phandle(), it will call
of_syscon_register() if the syscon device pointed to hasn't been registered yet.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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