From mboxrd@z Thu Jan 1 00:00:00 1970 From: broonie@opensource.wolfsonmicro.com (Mark Brown) Date: Mon, 6 Sep 2010 12:30:37 +0100 Subject: Colibri PXA320 Power management question In-Reply-To: References: <20100902142203.GA8381@sirena.org.uk> <4C7FB7B5.2010301@compulab.co.il> <20100902152705.GC5809@rakim.wolfsonmicro.main> <4C7FC606.20904@compulab.co.il> <20100906101320.GD10367@rakim.wolfsonmicro.main> Message-ID: <20100906113036.GG10367@rakim.wolfsonmicro.main> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Sep 06, 2010 at 07:09:44PM +0800, Eric Miao wrote: > On Mon, Sep 6, 2010 at 6:13 PM, Mark Brown > > That'd be slightly entertaining, though, since IIRC the hardware > > implementation isn't really set up for being constrained - it doesn't > > expect to be cooperating with software governors. > It doesn't need to. There is actually an internal command table, and > not really sure about the mapping scheme though, but when software > then has only to care about the frequencies, and voltages will be > adjusted accordingly. Ah, I'm misremembering the PXA implementation for the i.MX one - the i.MX version of this feature had a governor rather than just doing a lookup from the frequency to a voltage.