From: Yang Xiwen <forbidden405@outlook.com>

Add a missing test case for determine_rate implemented by mux. It tests
the behavior of determine_rate when requesting a rate that none of the
parents could give.

Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
---
 drivers/clk/clk_test.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index f9a5c2964c65d..9b1c90de90454 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -2215,6 +2215,15 @@ static void clk_leaf_mux_set_rate_parent_determine_rate(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, req.best_parent_rate, DUMMY_CLOCK_RATE_2);
 	KUNIT_EXPECT_PTR_EQ(test, req.best_parent_hw, &ctx->mux_ctx.hw);
 
+	// Test a non-existant rate which none of the parents could give
+	clk_hw_init_rate_request(hw, &req, DUMMY_CLOCK_INIT_RATE);
+
+	ret = __clk_determine_rate(hw, &req);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	KUNIT_EXPECT_EQ(test, req.rate, DUMMY_CLOCK_RATE_1);
+	KUNIT_EXPECT_EQ(test, req.best_parent_rate, DUMMY_CLOCK_RATE_1);
+	KUNIT_EXPECT_PTR_EQ(test, req.best_parent_hw, &ctx->mux_ctx.hw);
 	clk_put(clk);
 }
 

-- 
2.39.2

Quoting Yang Xiwen via B4 Relay (2023-04-25 00:46:40)
> From: Yang Xiwen <forbidden405@outlook.com>
> 
> Add a missing test case for determine_rate implemented by mux. It tests
> the behavior of determine_rate when requesting a rate that none of the
> parents could give.
> 
> Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
> ---
>  drivers/clk/clk_test.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
> index f9a5c2964c65d..9b1c90de90454 100644
> --- a/drivers/clk/clk_test.c
> +++ b/drivers/clk/clk_test.c
> @@ -2215,6 +2215,15 @@ static void clk_leaf_mux_set_rate_parent_determine_rate(struct kunit *test)
>         KUNIT_EXPECT_EQ(test, req.best_parent_rate, DUMMY_CLOCK_RATE_2);
>         KUNIT_EXPECT_PTR_EQ(test, req.best_parent_hw, &ctx->mux_ctx.hw);
>  
> +       // Test a non-existant rate which none of the parents could give
> +       clk_hw_init_rate_request(hw, &req, DUMMY_CLOCK_INIT_RATE);
> +
> +       ret = __clk_determine_rate(hw, &req);
> +       KUNIT_ASSERT_EQ(test, ret, 0);
> +
> +       KUNIT_EXPECT_EQ(test, req.rate, DUMMY_CLOCK_RATE_1);
> +       KUNIT_EXPECT_EQ(test, req.best_parent_rate, DUMMY_CLOCK_RATE_1);
> +       KUNIT_EXPECT_PTR_EQ(test, req.best_parent_hw, &ctx->mux_ctx.hw);

Please make an entire test case instead of modifying an existing test
case.