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clk: Add clk_drop_range

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In order to reset the range on a clock, we need to call
clk_set_rate_range with a minimum of 0 and a maximum of ULONG_MAX. Since
it's fairly inconvenient, let's introduce a clk_drop_range() function
that will do just this.

Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-8-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Maxime Ripard 2022-02-25 15:35:29 +01:00 committed by Stephen Boyd
parent c80ac50cbb
commit c974484378
2 changed files with 13 additions and 2 deletions
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4
drivers/clk/clk_test.c
View File

@ -645,7 +645,7 @@ static void clk_range_test_multiple_set_range_rate_maximized(struct kunit *test)
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user2, 0, ULONG_MAX),
clk_drop_range(user2),
0);
rate = clk_get_rate(clk);
@ -762,7 +762,7 @@ static void clk_range_test_multiple_set_range_rate_minimized(struct kunit *test)
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user2, 0, ULONG_MAX),
clk_drop_range(user2),
0);
rate = clk_get_rate(clk);

11
include/linux/clk.h
View File

@ -986,6 +986,17 @@ static inline void clk_bulk_disable_unprepare(int num_clks,
clk_bulk_unprepare(num_clks, clks);
}
/**
* clk_drop_range - Reset any range set on that clock
* @clk: clock source
*
* Returns success (0) or negative errno.
*/
static inline int clk_drop_range(struct clk *clk)
{
return clk_set_rate_range(clk, 0, ULONG_MAX);
}
/**
* clk_get_optional - lookup and obtain a reference to an optional clock
* producer.