linux-kernel - Re: i2c: introduce i2c helper i2c_find_client_by

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Message-ID: <CAHp75VeasHGariq=v005NSUTe_+e471NYbEoSzPJXcFNgsfKNQ@mail.gmail.com>
Date:	Fri, 12 Jul 2013 13:54:20 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Bin Gao <bin.gao@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: i2c: introduce i2c helper i2c_find_client_by_name()

On Fri, Jul 5, 2013 at 10:55 PM, Mark Brown <broonie@...nel.org> wrote:
> On Thu, Jun 06, 2013 at 11:33:46AM -0700, Bin Gao wrote:
>
>> A good example is that an ISP(Imaging Signal Processor) driver needs
>> register i2c camera sensor devices via v4l2, so it has to unregister
>> all i2c clients that were previously registered by calling
>> i2c_register_board_info(), and then re-register. For this case we
>> can use this helper to get i2c_client by passing the client name.
>
> Please look at the work that IIRC Laurent Pichart (CCed) was doing on
> developing generic DT bindings for v4l in embedded systems,

I couldn't find anything related to OF except v4l2-of.c in the v4l2-core.
Is that what you mentioned?

> it sounds
> like you're working on similar hardware here.  The general ideas should
> apply to any enumeration mechanism, not just DT.

Briefly looking into ACPI tables we have and mechanisms that we can
use in ACPI case, I doubt we may apply all the ideas, probably some of
them, though I didn't get yet where to read about in details. What I
could say now is that the patch provided by Bin Gao is definitely no
go.

--
With Best Regards,
Andy Shevchenko
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