linux-kernel - [PATCH 7/8] clk: test: introduce test variation for sibling rate changes on a mux

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Message-ID: <20250407131258.70638-8-bmasney@redhat.com>
Date: Mon,  7 Apr 2025 09:12:57 -0400
From: Brian Masney <bmasney@...hat.com>
To: sboyd@...nel.org,
	mturquette@...libre.com
Cc: linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	mripard@...hat.com
Subject: [PATCH 7/8] clk: test: introduce test variation for sibling rate changes on a mux

Introduce a test variation that creates a parent with two children: a
divider and a mux. Ensure that changing the rate of the divider does not
affect the rate of the mux.

Signed-off-by: Brian Masney <bmasney@...hat.com>
---
 drivers/clk/clk_test.c | 46 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index d72ce0226dc7..97909caa71b2 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -900,6 +900,48 @@ clk_rate_change_sibling_div_gate_test_init(struct kunit *test)
 	return &ctx->clk_ctx;
 }
 
+struct clk_rate_change_sibling_div_mux_sibling_context {
+	struct clk_dummy_div child1;
+	struct clk_multiple_parent_ctx child2_mux;
+	struct clk_test_rate_change_sibling_clk_ctx clk_ctx;
+};
+
+static struct clk_test_rate_change_sibling_clk_ctx *
+clk_rate_change_sibling_div_mux_test_init(struct kunit *test)
+{
+	struct clk_rate_change_sibling_div_mux_sibling_context *ctx;
+	int ret;
+
+	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+	test->priv = ctx;
+
+	ret = clk_init_multiple_parent_ctx(test, &ctx->child2_mux,
+					   "parent0", DUMMY_CLOCK_RATE_24_MHZ,
+					   "parent1", DUMMY_CLOCK_RATE_48_MHZ,
+					   "child2", CLK_SET_RATE_NO_REPARENT,
+					   &clk_multiple_parents_mux_ops);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ctx->child1.hw.init = CLK_HW_INIT_HW("child1",
+					     &ctx->child2_mux.parents_ctx[0].hw,
+					     &clk_dummy_div_ops,
+					     CLK_SET_RATE_PARENT);
+	ret = clk_hw_register_kunit(test, NULL, &ctx->child1.hw);
+	if (ret)
+		return ERR_PTR(ret);
+
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	ctx->clk_ctx.parent_clk = clk_hw_get_clk(&ctx->child2_mux.parents_ctx[0].hw, NULL);
+	ctx->clk_ctx.child1_clk = clk_hw_get_clk(&ctx->child1.hw, NULL);
+	ctx->clk_ctx.child2_clk = clk_hw_get_clk(&ctx->child2_mux.hw, NULL);
+
+	return &ctx->clk_ctx;
+}
+
 struct clk_test_rate_change_sibling_test_case {
 	const char *desc;
 	struct clk_test_rate_change_sibling_clk_ctx *(*init)(struct kunit *test);
@@ -910,6 +952,10 @@ static struct clk_test_rate_change_sibling_test_case clk_test_rate_change_siblin
 		.desc = "div_gate",
 		.init = clk_rate_change_sibling_div_gate_test_init,
 	},
+	{
+		.desc = "div_mux",
+		.init = clk_rate_change_sibling_div_mux_test_init,
+	},
 };
 
 KUNIT_ARRAY_PARAM_DESC(clk_test_rate_change_sibling_test_case,
-- 
2.49.0