[PATCH v5 06/11] clk: Add clk_drop_range

Maxime Ripard
2022-02-22T13:19:13Z

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>
---
drivers/clk/clk_test.c | 4 ++--
include/linux/clk.h | 11 +++++++++++
2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index b23859d1b460..f108e2dcc351 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -640,7 +640,7 @@ 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);
@@ -757,7 +757,7 @@ 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);
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 266e8de3cb51..39faa54efe88 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -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.
--
2.35.1