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

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Message-ID: <20121117135435.GA13479@lunn.ch>
Date:	Sat, 17 Nov 2012 14:54:35 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Andrew Lunn <andrew@...n.ch>, linux-arm-kernel@...ts.infradead.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: mvebu: armada 370/XP add clock gating control
 provider for DT

> > 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.

     Andrew
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