[PATCH 07/18] dmaengine/amba-pl08x: Enable/Disable amba_pclk with channel requests

[Russell King - ARM Linux]

On Fri, Jul 29, 2011 at 04:19:17PM +0530, Viresh Kumar wrote:
> Amba devices have interface clocks attached as adev->pclk. This is the only
> clock associated with DMAC and it can be disabled when DMAC is not in use. This
> patch adds support to enable/disable this clk as and when channels are requested
> and freed. Also it disables this clock at the end of probe.

It may make better sense to convert this to runtime PM.  I suspect
that there's core support which the amba/bus.c can do to help in that
respect (eg, managing the apb pclk itself) so that we don't have to
add the same code to every primecell driver.