Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1255733

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

Show all headers | View raw

On Mon, Sep 21, 2015 at 4:02 PM, Tomeu Vizoso
<tomeu.vizoso@collabora.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@collabora.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@linux-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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH v6 04/22] of: add function to allow probing a device from  a OF node Geert Uytterhoeven <geert@linux-m68k.org> - 2015-10-26 09:20 +0100
  Re: [PATCH v6 04/22] of: add function to allow probing a device from  a OF node Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-27 15:50 +0100

csiph-web