linux-kernel - Re: [PATCH] OMAP: hwmod: add kernel cmdline flag to avoid resetting IP blocks during init

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Message-ID: <20110706064326.GI5783@atomide.com>
Date:	Tue, 5 Jul 2011 23:43:26 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Paul Walmsley <paul@...an.com>
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Aaro Koskinen <aaro.koskinen@...ia.com>,
	Rajendra Nayak <rnayak@...com>,
	Benoît Cousson <b-cousson@...com>,
	Michael Buesch <mb@...sch.de>
Subject: Re: [PATCH] OMAP: hwmod: add kernel cmdline flag to avoid
 resetting IP blocks during init

* Paul Walmsley <paul@...an.com> [110705 18:55]:
> On Tue, 5 Jul 2011, Paul Walmsley wrote:
> 
> > For this case, we probably need some board file function to tell the 
> > hwmod code to disregard a device completely, to tell the kernel to 
> > pretend that the device does not exist.
> 
> ... and the other problem here is that we currently probe devices via an 
> arch_initcall(), and the board file init_machine is also an arch_initcall.
> Either we'll need to be very careful about Makefile ordering, or we should 
> just call omap2_init_devices() from the board file init_machine directly.
> The latter makes the most sense to me.

And that can then be passed the list of devices with the special flags
for noreset, disabled and reserved. Then the late_initcall can optionally
reset the rest of the devices.

Regards,

Tony
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