linux-kernel - Re: [PATCH 1/2] clk: mvebu: armada 370/XP add clock gating control provider for DT

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Message-ID: <20121119043034.21126.92888@nucleus>
Date:	Sun, 18 Nov 2012 20:30:34 -0800
From:	Mike Turquette <mturquette@...com>
To:	Andrew Lunn <andrew@...n.ch>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>
CC:	Andrew Lunn <andrew@...n.ch>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 1/2] clk: mvebu: armada 370/XP add clock gating control provider
 for DT

Quoting Andrew Lunn (2012-11-17 05:54:35)
> > > What is the ddr clock for? Does bad things happen if you turn it off?
> > > Kirkwood has a similar clock, dunit, which i decided not to export,
> > > since when you turn it off, the whole SoC locks up.
> > 
> > Well of course if you code run in DDR then it could be a problem. But
> > I think it could be useful to turn it off when going to suspend, it
> > the DDR can do self-refresh. In this case it should be possible to run
> > the code from SRAM or L2 Cache.
> 
> O.K. Just watch out for the lateinit call in the clock framework.
> 

CLK_IGNORE_UNUSED is the flag you want for this situation.

Regards,
Mike

>      Andrew
> 
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