linux-kernel - [PATCH 2/2] clk: fixed-factor: Re-introduce support for clocks to set parent clock-rate

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Date:   Mon, 26 Dec 2022 15:27:45 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Tomi Valkeinen <tomba@...nel.org>,
        Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <mripard@...nel.org>,
        Linux Clock List <linux-clk@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Jai Luthra <j-luthra@...com>, Aradhya Bhatia <a-bhatia1@...com>
Subject: [PATCH 2/2] clk: fixed-factor: Re-introduce support for clocks to set parent clock-rate

Add support for the clock "ti,k3-am62-oldi-clk-div".
Also add support for this clock to propagate the clock set request to
its parent clock, by setting the CLK_SET_RATE_PARENT flag.

Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
---
 drivers/clk/clk-fixed-factor.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index f734e34735a9..1a78e2d870dd 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -245,10 +245,16 @@ struct clk_hw *devm_clk_hw_register_fixed_factor(struct device *dev,
 EXPORT_SYMBOL_GPL(devm_clk_hw_register_fixed_factor);
 
 #ifdef CONFIG_OF
+static const struct of_device_id set_rate_parent_matches[] = {
+	{ .compatible = "ti,k3-am62-oldi-clk-div" },
+	{ /* Sentinel */ },
+};
+
 static struct clk_hw *_of_fixed_factor_clk_setup(struct device_node *node)
 {
 	struct clk_hw *hw;
 	const char *clk_name = node->name;
+	unsigned long flags = 0;
 	u32 div, mult;
 	int ret;
 
@@ -264,10 +270,13 @@ static struct clk_hw *_of_fixed_factor_clk_setup(struct device_node *node)
 		return ERR_PTR(-EIO);
 	}
 
+	if (of_match_node(set_rate_parent_matches, node))
+		flags |= CLK_SET_RATE_PARENT;
+
 	of_property_read_string(node, "clock-output-names", &clk_name);
 
 	hw = __clk_hw_register_fixed_factor(NULL, node, clk_name, NULL, NULL, 0,
-					    0, mult, div, false);
+					    flags, mult, div, false);
 	if (IS_ERR(hw)) {
 		/*
 		 * Clear OF_POPULATED flag so that clock registration can be
-- 
2.39.0