linux-kernel - Re: [RFC 02/17] ARM: call clk_of_init from time

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Date:	Wed, 21 Aug 2013 20:51:46 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 02/17] ARM: call clk_of_init from time_init

On Tuesday 20 August 2013, Stephen Warren wrote:
> On 08/20/2013 02:44 PM, Arnd Bergmann wrote:
> > On Tuesday 20 August 2013, Stephen Warren wrote:

> Hmm. This probably isn't too hard. I /think/ the only reason the clocks
> are initialized early is:
> 
> * The PMC HW block is involved in the path of some interrupts (i.e. it
> inverts, or not, the IRQ input pin dedicated to the PMIC).
> 
> * So, that part of the PMC must be initialized early so that the IRQ
> polarity is correct.
> 
> * The PMC initialization is currently monolithic, and the PMC has some
> clock inputs, so the init routine ends up calling of_clk_get_by_name(),
> and hence clocks must be set up early too.
> 
> Perhaps if we just separate tegra_pmc_init() into two functions which
> initialize different parts of the PMC, we can get rid of the
> tegra_dt_init_irq() -> tegra_pmc_init() -> of_clk_get_by_name() call
> path, and hence move Tegra's call to of_clk_init() to the typical place.

That sounds good to me, thanks for looking into it.

	Arnd
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