linux-kernel - Re: [PATCH] AB3100 regulator support v1

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Date:	Sun, 30 Aug 2009 02:37:51 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH] AB3100 regulator support v1

2009/8/30 Linus Walleij <linus.ml.walleij@...il.com>:

> So this is because I am in the parents probe() function of course,
> and it's all expected.

I was curious how wm8350 on MX31 did this while using only subsys_initcalls()
(wm8400 doesn't look like it's completed yet) and found:

subsys_initcall_() ->
drivers/mfd/wm8350-i2c.:wm8350_i2c_init() ->
drivers/mfd/wm8350-i2c.c:wm8350_i2c_probe() ->
drivers/mfd/wm8350-core.c:wm8350_device_init() ->
arch/arm/mach-mx3/mx31ads.c:mx31_wm8350_init() ->
drivers/regulator/wm8350-regulator.c:wm8350_register_regulator()

which creates a platform device and sets the parent to
the struct wm8350->dev. But this is actually the i2c_client dev
and then it is not so strange that it works nicely to have both
the 8350 core device as parent and the platform devices as
children in a subsys_initcall() since the i2c core does not
use the regular device driver matching scheme, but rolls it's
own (which does NOT try to take the parent's semaphore...)

Linus Walleij
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