linux-kernel - Re: [PATCH v7 2/3] clk: introduce the common clock framework

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Date:	Fri, 23 Mar 2012 14:33:00 -0700
From:	Saravana Kannan <skannan@...eaurora.org>
To:	"Turquette, Mike" <mturquette@...com>
CC:	Shawn Guo <shawn.guo@...aro.org>, Paul Walmsley <paul@...an.com>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	patches@...aro.org, Magnus Damm <magnus.damm@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergman <arnd.bergmann@...aro.org>
Subject: Re: [PATCH v7 2/3] clk: introduce the common clock framework

On 03/20/2012 08:10 PM, Saravana Kannan wrote:
> On 03/20/2012 04:53 PM, Turquette, Mike wrote:
>> It does make me
>> wonder if it would be a good idea to pass in the parent rate for
>> .set_parent, which is analogous to .set_rate in many ways.
>
> I need to think a bit more about this.

I was thinking about this. I think the common clock fwk should let the 
set_parent ops "return" the rate of the clock in addition to passing the 
rate of the parent in.

Say this is a divider clock and some one changes the parent. The cached 
"rate" of the clock in the clock fwk is no longer correct. So, the clock 
fwk should also add a "*new_rate" param to set parent ops.

Thanks,
Saravana

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