linux-kernel - Re: [PATCH 07/18] dmaengine/amba-pl08x: Enable/Disable amba

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Message-ID: <20110730120740.GA15791@n2100.arm.linux.org.uk>
Date:	Sat, 30 Jul 2011 13:07:40 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	linus.walleij@...aro.org, pratyush.anand@...com,
	rajeev-dlh.kumar@...com, bhupesh.sharma@...com,
	shiraz.hashim@...com, vinod.koul@...el.com,
	linux-kernel@...r.kernel.org, vipin.kumar@...com,
	armando.visconti@...com, amit.virdi@...com,
	vipulkumar.samar@...com, viresh.linux@...il.com,
	deepak.sikri@...com, dan.j.williams@...el.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 07/18] dmaengine/amba-pl08x: Enable/Disable amba_pclk
	with channel requests

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.
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