linux-kernel - [PATCH 0/4] Allow cpufreq-dt to defer probe if OPP table is not ready

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Date:	Tue, 16 Dec 2014 15:09:35 -0800
From:	Dmitry Torokhov <dtor@...omium.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Stefan Wahren <stefan.wahren@...e.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Nishanth Menon <nm@...com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] Allow cpufreq-dt to defer probe if OPP table is not ready

[ Resending as my previous attempt appears to be messed up... ]

This series change cpufreq-dt driver to return -EPROBE_DEFER in case OPP table
is not ready by the time it gets to initialize. The use case is for platforms
that use platform code (or maybe a different driver altogether) to provide OPP
tables.

In addition to changes to cpufreq-dt there are assorted changes to OPP code to
make it work a bit better.

Note that I am not happy with OPP code: dev_pm_opp_init_cpufreq_table() is
wrong in it's assumption that taking RCU lock will guarantee that number of
OPPs will not change - we can remove OPP from list just fine, and then
initialization will fail. I also think that we shoudl change API so users should
get a reference to their OPP table and then pass opaque dev_opp pointer to
accessor APIs instead of re-scanning the global list over and over and over.

Thanks,
Dmitry

Dmitry Torokhov (4):
  PM / OPP: add some lockdep annotations
  PM / OPP: fix warning in of_free_opp_table
  PM / OPP: take RCU lock in dev_pm_opp_get_opp_count
  cpufreq-dt: defer probing if OPP table is not ready

 drivers/base/power/opp.c     | 39 +++++++++++++++++++++++++++++++--------
 drivers/cpufreq/cpufreq-dt.c | 11 +++++++++++
 2 files changed, 42 insertions(+), 8 deletions(-)

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