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clk: Mention that .recalc_rate can return 0 on error

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Multiple platforms (amlogic, imx8) return 0 when the clock rate cannot
be determined properly by the recalc_rate hook. Mention in the
documentation that the framework is ok with that.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-5-maxime@cerno.tech
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Maxime Ripard 2022-08-16 13:25:09 +02:00 committed by Stephen Boyd
parent facf949b2e
commit f24a0b1c22
1 changed files with 3 additions and 2 deletions
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5
include/linux/clk-provider.h
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@ -118,8 +118,9 @@ struct clk_duty {
*
* @recalc_rate Recalculate the rate of this clock, by querying hardware. The
* parent rate is an input parameter. It is up to the caller to
* ensure that the prepare_mutex is held across this call.
* Returns the calculated rate. Optional, but recommended - if
* ensure that the prepare_mutex is held across this call. If the
* driver cannot figure out a rate for this clock, it must return
* 0. Returns the calculated rate. Optional, but recommended - if
* this op is not set then clock rate will be initialized to 0.
*
* @round_rate: Given a target rate as input, returns the closest rate actually