linux-kernel - [PATCH v2 04/10] clk: test: introduce clk_dummy

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Message-Id: <20250528-clk-wip-v2-v2-4-0d2c2f220442@redhat.com>
Date: Wed, 28 May 2025 19:16:50 -0400
From: Brian Masney <bmasney@...hat.com>
To: Stephen Boyd <sboyd@...nel.org>, Maxime Ripard <mripard@...nel.org>
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>, 
 Michael Turquette <mturquette@...libre.com>, 
 Alberto Ruiz <aruiz@...hat.com>, Brian Masney <bmasney@...hat.com>
Subject: [PATCH v2 04/10] clk: test: introduce clk_dummy_div for a mock
 divider

This is used to mock up a divider in the clk kunit tests.

Signed-off-by: Brian Masney <bmasney@...hat.com>
---
 drivers/clk/clk_test.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index 1b34d54ec9c610ffa3e91b06f5a5180e0395e26f..4908fb9c0c46e34063ecf696e49b48510da44538 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -140,6 +140,47 @@ static const struct clk_ops clk_dummy_single_parent_ops = {
 	.get_parent = clk_dummy_single_get_parent,
 };
 
+// 4 ought to be enough for anybody
+#define CLK_DUMMY_DIV_WIDTH 4
+
+struct clk_dummy_div {
+	struct clk_hw hw;
+	unsigned int div;
+};
+
+static unsigned long clk_dummy_div_recalc_rate(struct clk_hw *hw,
+					       unsigned long parent_rate)
+{
+	struct clk_dummy_div *div = container_of(hw, struct clk_dummy_div, hw);
+
+	return divider_recalc_rate(hw, parent_rate, div->div, NULL,
+				   CLK_DIVIDER_ROUND_CLOSEST, CLK_DUMMY_DIV_WIDTH);
+}
+
+static long clk_dummy_div_round_rate(struct clk_hw *hw, unsigned long rate,
+				     unsigned long *parent_rate)
+{
+	return divider_round_rate(hw, rate, parent_rate, NULL,
+				  CLK_DUMMY_DIV_WIDTH, CLK_DIVIDER_ROUND_CLOSEST);
+}
+
+static int clk_dummy_div_set_rate(struct clk_hw *hw, unsigned long rate,
+				  unsigned long parent_rate)
+{
+	struct clk_dummy_div *div = container_of(hw, struct clk_dummy_div, hw);
+
+	div->div = divider_get_val(rate, parent_rate, NULL, CLK_DUMMY_DIV_WIDTH,
+				   CLK_DIVIDER_ROUND_CLOSEST);
+
+	return 0;
+}
+
+static const struct clk_ops clk_dummy_div_ops = {
+	.recalc_rate = clk_dummy_div_recalc_rate,
+	.round_rate = clk_dummy_div_round_rate,
+	.set_rate = clk_dummy_div_set_rate,
+};
+
 struct clk_multiple_parent_ctx {
 	struct clk_dummy_context parents_ctx[2];
 	struct clk_hw hw;

-- 
2.49.0