linux-kernel - Re: [PATCHv2 3/4] clk: new basic clk type for fractional divider

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Message-ID: <1514106.ndh3ZJ8v0Y@vostro.rjw.lan>
Date:	Mon, 19 May 2014 02:15:52 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jin Yao <yao.jin@...ux.intel.com>,
	Li Aubrey <aubrey.li@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 3/4] clk: new basic clk type for fractional divider

On Friday, May 16, 2014 06:34:03 PM Mike Turquette wrote:
> Quoting Rafael J. Wysocki (2014-05-16 17:15:43)
> > On Friday, May 16, 2014 04:09:05 PM Mike Turquette wrote:
> > > Quoting Rafael J. Wysocki (2014-05-16 15:38:05)
> > > > On Thursday, May 15, 2014 09:53:49 AM Mike Turquette wrote:
> > > > > Quoting Heikki Krogerus (2014-05-15 06:40:25)
> > > > > > Fractional divider clocks are fairly common. This adds basic
> > > > > > type for them.
> > > > > > 
> > > > > > Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> > > > > 
> > > > > Taken into clk-next.
> > > > > 
> > > > > Just FYI, there was some talk at Embedded Linux Conference on providing
> > > > > a better abstraction layer for some of these "basic" clock types. This
> > > > > abstraction would allow the basic clock types to implement the
> > > > > machine-agnostic logic (e.g. an incoming rate is divided by a value) and
> > > > > then platforms and drivers could plug in the machine-specific parts
> > > > > (e.g. divider is made up of m/n, or divider is power-of-two, or divider
> > > > > is a simple integer with min == 1 and max == 5).
> > > > > 
> > > > > All of that is to say that in time this fractional divider could go away
> > > > > once the abstraction layer allows us to fold the m/n divider stuff into
> > > > > a core divider implementation.
> > > > > 
> > > > > Nothing wrong with the patch for now, so I've taken it for 3.16.
> > > > 
> > > > Well, OK, but I guess [4/4] depends on it and [4/4] also depends on
> > > > [1-2/4], so how you're proposing to resolve this?
> > > 
> > > I haven't yet published this patch to my tree, so no harm done. How
> > > about the following Formal Proposals?
> > > 
> > > 1) I ack the patch and don't merge it through my tree. You take it.
> > > 2) I provide a topic branch that we both merge.
> > > 
> > > Your choice.
> > 
> > Thanks!  I'd prefer 1) to be honest. :-)
> 
> Acked-by: Mike Turquette <mturquette@...aro.org>

Thanks!

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