linux-kernel - Re: [PATCH v2 1/7] clk: Add a generic clock infrastructure

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Message-ID: <20111014103233.GB9485@b20223-02.ap.freescale.net>
Date:	Fri, 14 Oct 2011 18:32:33 +0800
From:	Richard Zhao <richard.zhao@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	<jeremy.kerr@...onical.com>, <paul@...an.com>,
	<linaro-dev@...ts.linaro.org>, <linus.walleij@...ricsson.com>,
	<linux-arm-kernel@...ts.infradead.org>, <patches@...aro.org>,
	<magnus.damm@...il.com>, <linux-kernel@...r.kernel.org>,
	<eric.miao@...aro.org>, <grant.likely@...retlab.ca>,
	<dsaxena@...aro.org>, <tglx@...utronix.de>,
	<amit.kucheria@...aro.org>, <linux@....linux.org.uk>,
	<arnd.bergmann@...aro.org>, <sboyd@...inc.com>,
	<skannan@...cinc.com>, <shawn.guo@...escale.com>,
	Mike Turquette <mturquette@...com>
Subject: Re: [PATCH v2 1/7] clk: Add a generic clock infrastructure

On Fri, Oct 14, 2011 at 11:05:04AM +0100, Mark Brown wrote:
> On Fri, Oct 14, 2011 at 04:10:26PM +0800, Richard Zhao wrote:
> > On Thu, Sep 22, 2011 at 03:26:56PM -0700, Mike Turquette wrote:
> 
> snip essentially Mike's entire mail - *please* delete irrelevant quotes
> from your replies, it makes it very much easier to find the new text in
> your mail and is much more friendly to people reading mail on mobile
> devices.
I snip not enough? sorry for that. I'll be carefull.
> 
> > > +static int __clk_enable(struct clk *clk)
> > > +{
> 
> > Could you expose __clk_enable/__clk_disable? I find it hard to implement
> > clk group. clk group means, when a major clk enable/disable, it want a set
> > of other clks enable/disable accordingly.
> 
> Shouldn't this be something the core is implementing?  I'd strongly
> expect that the clock drivers are relatively dumb and delegate all the
> decision making to the core API.  Otherwise it's going to be hard for
> the core to implement any logic that involves working with more than one
> clock like rate change notification, or guarantee that driver requests
> made through the API are satisfied, as the state of the clocks will be
> changing underneath it.
>From my point of view, the first step of generic clk can be, easy to adopt
features of clocks in current mainline git.
Back to the clk group, I have a patch based on Sascha's work. 
http://git.linaro.org/gitweb?p=people/riczhao/linux-2.6.git;a=shortlog;h=refs/heads/imx-clk

Thanks
Richard
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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