clk: add a clk_hw helpers to get the clock device or device_node

Add helpers to get the device or device_node associated with clk_hw.

This can be used by clock drivers to access various device related
functionality such as devres, dev_ prints, etc ...

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20250417-clk-hw-get-helpers-v1-1-7743e509612a@baylibre.com
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk.c

@@ -365,6 +365,18 @@ const char *clk_hw_get_name(const struct clk_hw *hw)
 }
 EXPORT_SYMBOL_GPL(clk_hw_get_name);
 
+struct device *clk_hw_get_dev(const struct clk_hw *hw)
+{
+	return hw->core->dev;
+}
+EXPORT_SYMBOL_GPL(clk_hw_get_dev);
+
+struct device_node *clk_hw_get_of_node(const struct clk_hw *hw)
+{
+	return hw->core->of_node;
+}
+EXPORT_SYMBOL_GPL(clk_hw_get_of_node);
+
 struct clk_hw *__clk_get_hw(struct clk *clk)
 {
 	return !clk ? NULL : clk->core->hw;

include/linux/clk-provider.h

@@ -1360,6 +1360,32 @@ void clk_hw_unregister(struct clk_hw *hw);
 /* helper functions */
 const char *__clk_get_name(const struct clk *clk);
 const char *clk_hw_get_name(const struct clk_hw *hw);
+
+/**
+ * clk_hw_get_dev() - get device from an hardware clock.
+ * @hw: the clk_hw pointer to get the struct device from
+ *
+ * This is a helper to get the struct device associated with a hardware
+ * clock. Some clock controllers, such as the one registered with
+ * CLK_OF_DECLARE(), may have not provided a device pointer while
+ * registering the clock.
+ *
+ * Return: the struct device associated with the clock, or NULL if there
+ * is none.
+ */
+struct device *clk_hw_get_dev(const struct clk_hw *hw);
+
+/**
+ * clk_hw_get_of_node() - get device_node from a hardware clock.
+ * @hw: the clk_hw pointer to get the struct device_node from
+ *
+ * This is a helper to get the struct device_node associated with a
+ * hardware clock.
+ *
+ * Return: the struct device_node associated with the clock, or NULL
+ * if there is none.
+ */
+struct device_node *clk_hw_get_of_node(const struct clk_hw *hw);
 #ifdef CONFIG_COMMON_CLK
 struct clk_hw *__clk_get_hw(struct clk *clk);
 #else