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

[Dmitry Torokhov <dtor@chromium.org>]

[ 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(-)