linux-kernel - Re: [PATCH v3 0/5] common clk framework

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Message-ID: <CAJOA=zMGaXLrC=sLzrZKTqAKqQHpmn9=xx94ucaCsFAZ6EfYqw@mail.gmail.com>
Date:	Sat, 26 Nov 2011 17:12:47 -0800
From:	"Turquette, Mike" <mturquette@...com>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	linux@....linux.org.uk, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	jeremy.kerr@...onical.com, broonie@...nsource.wolfsonmicro.com,
	tglx@...utronix.de, linus.walleij@...ricsson.com,
	amit.kucheria@...aro.org, dsaxena@...aro.org, patches@...aro.org,
	linaro-dev@...ts.linaro.org, aul@...an.com,
	grant.likely@...retlab.ca, sboyd@...cinc.com, skannan@...cinc.com,
	magnus.damm@...il.com, arnd.bergmann@...aro.org,
	eric.miao@...aro.org, richard.zhao@...aro.org
Subject: Re: [PATCH v3 0/5] common clk framework

On Fri, Nov 25, 2011 at 11:06 PM, Shawn Guo <shawn.guo@...escale.com> wrote:
> On Mon, Nov 21, 2011 at 05:40:42PM -0800, Mike Turquette wrote:
>>   .speaking of which, clk_set_rate has been overhauled and is now
>> recursive. *collective groan*.  clk_set_rate is still simple for the
>> common case of simply setting a single clk's rate.  But if your clk has
>> the CLK_PARENT_SET_RATE flag and the .round_rate callback recommends
>> changing the parent rate, then clk_set_rate will recurse upwards to the
>> parent and try it all over again.  In the event of a failure everything
>> unwinds and all the clks go out for drinks.
>>
> I smell that this will be the part which makes the whole series risky
> of being accepted in a desired time frame, with saying rate change
> notifications are still missing for now.

I agree.  I'll send out V4 this coming week with the clk rate change
notifiers rolled in.  That means that there won't be any missing
pieces for my vision of how a complex clk tree should interact with
drivers.  If it is not what people want then we can probably de-scope
pieces of it, but I think the architecture is sound.

Thanks for reviewing Shawn.

Regards,
Mike
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