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clk: add clk_round_rate()

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It returns the rate which will be set if you ask clk_set_rate() to set
that rate. It provides a way to query exactly what rate you'll get if
you call clk_set_rate() with that same argument.
So essentially, clk_round_rate() and clk_set_rate() are equivalent
except the former does not modify the clock hardware in any way.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
This commit is contained in:
Dario Binacchi
2020-12-30 00:06:31 +01:00
committed by Lokesh Vutla
parent 6337d53fdf
commit 2983ad55a1
7 changed files with 109 additions and 0 deletions
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22
test/dm/clk.c
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@@ -112,6 +112,28 @@ static int dm_test_clk(struct unit_test_state *uts)
rate = sandbox_clk_test_set_rate(dev_test, SANDBOX_CLK_TEST_ID_I2C, 0);
ut_assert(IS_ERR_VALUE(rate));
ut_asserteq(10000, sandbox_clk_test_get_rate(dev_test,
SANDBOX_CLK_TEST_ID_SPI));
ut_asserteq(20000, sandbox_clk_test_get_rate(dev_test,
SANDBOX_CLK_TEST_ID_I2C));
ut_asserteq(5000, sandbox_clk_test_round_rate(dev_test,
SANDBOX_CLK_TEST_ID_SPI,
5000));
ut_asserteq(7000, sandbox_clk_test_round_rate(dev_test,
SANDBOX_CLK_TEST_ID_I2C,
7000));
ut_asserteq(10000, sandbox_clk_test_get_rate(dev_test,
SANDBOX_CLK_TEST_ID_SPI));
ut_asserteq(20000, sandbox_clk_test_get_rate(dev_test,
SANDBOX_CLK_TEST_ID_I2C));
rate = sandbox_clk_test_round_rate(dev_test, SANDBOX_CLK_TEST_ID_SPI, 0);
ut_assert(IS_ERR_VALUE(rate));
rate = sandbox_clk_test_round_rate(dev_test, SANDBOX_CLK_TEST_ID_I2C, 0);
ut_assert(IS_ERR_VALUE(rate));
ut_asserteq(10000, sandbox_clk_test_get_rate(dev_test,
SANDBOX_CLK_TEST_ID_SPI));
ut_asserteq(20000, sandbox_clk_test_get_rate(dev_test,