clk: add clk_rate_exclusive api

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Using clock rate protection, we can now provide a way for clock consumer
to claim exclusive control over the rate of a producer

So far, rate change operations have been a "last write wins" affair. This
changes allows drivers to explicitly protect against this behavior, if
required.

Of course, if exclusivity over a producer is claimed more than once, the
rate is effectively locked as exclusivity cannot be preempted

Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20171201215200.23523-10-jbrunet@baylibre.com

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Jerome Brunet 2017-12-01 22:51:59 +01:00 • committed by Michael Turquette

parent c5ce26edb4

commit 55e9b8b7b8

2 changed files with 234 additions and 0 deletions

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172

drivers/clk/clk.c

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62

include/linux/clk.h

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