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clk: Clarify clk_get_rate() expectations

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As shown by a number of clock users already, clk_get_rate() can be
called whether or not the clock is enabled.

Similarly, a number of clock drivers will return a rate of 0 whenever
the rate cannot be figured out.

Since it was a bit ambiguous before, let's make it clear in the
clk_get_rate() documentation.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220816112530.1837489-6-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 13:25:10 +02:00 committed by Stephen Boyd
parent f24a0b1c22
commit bde8870cd8
1 changed files with 3 additions and 2 deletions
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5
drivers/clk/clk.c
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@ -1672,8 +1672,9 @@ static unsigned long clk_core_get_rate_recalc(struct clk_core *core)
* @clk: the clk whose rate is being returned
*
* Simply returns the cached rate of the clk, unless CLK_GET_RATE_NOCACHE flag
* is set, which means a recalc_rate will be issued.
* If clk is NULL then returns 0.
* is set, which means a recalc_rate will be issued. Can be called regardless of
* the clock enabledness. If clk is NULL, or if an error occurred, then returns
* 0.
*/
unsigned long clk_get_rate(struct clk *clk)
{