linux-kernel - [PATCH 0/3] arm: kirkwood: model cpu clock mux and update cpufreq driver

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Date:	Mon,  1 Sep 2014 11:47:02 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	patches@...aro.org, Mike Turquette <mturquette@...aro.org>,
	Andrew Lunn <andrew@...n.ch>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: [PATCH 0/3] arm: kirkwood: model cpu clock mux and update cpufreq driver

While reviewing Tomeu's "Per-user clock constraints" series I saw that
the Kirkwood cpufreq driver needed to use a new, public clk_is_enabled()
which I hoped not to merge [0].

This led to some investigation as to why this was needed and with
Andrew's help I came to realize that the powersave_clk on the kirkwood
platform acts more like a clock signal multiplexer than a gate. This mux
is unique to Kirkwood; none of the other mvebu platforms have it.

This series updates the kirkwood clock driver to model the powersave_clk
as a mux instead of a gate, and it updates and slightly simplifies the
cpufreq driver to use this clock as a mux.

Rafael & Viresh: I'd prefer to merge the cpufreq driver patch through
the clock tree since Tomeu's changes to the clock core depend on it.

[0] http://lkml.kernel.org/r/CAPtuhThyUPrY2AqVEsyRQqR-8hsj_GAe1W0u_XXonP-C2o_Xew@mail.gmail.com

Mike Turquette (3):
  clk: mvebu: share locks between gate clocks
  clk: mvebu: powersave clock is a multiplexer
  cpufreq: kirkwood: use the powersave multiplexer

 drivers/clk/mvebu/common.c         |   9 ++--
 drivers/clk/mvebu/common.h         |   2 +
 drivers/clk/mvebu/kirkwood.c       | 102 ++++++++++++++++++++++++++++++++++++-
 drivers/cpufreq/kirkwood-cpufreq.c |  14 ++---
 4 files changed, 113 insertions(+), 14 deletions(-)

-- 
1.8.3.2

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