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Commit f66541ba authored by Jyri Sarha's avatar Jyri Sarha Committed by Stephen Boyd
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clk: gpio: Get parent clk names in of_gpio_clk_setup() 



Get parent clk names in of_gpio_clk_setup() and store the names
in struct clk_gpio_delayed_register_data instead of doing it from
the clk provider's get() callback. of_clk_get_parent_name() can't
be called in struct of_clk_provider's get() callback since it may
make a call to of_clk_get_from_provider() and this in turn tries
to recursively lock of_clk_mutex.

Signed-off-by: default avatarJyri Sarha <jsarha@ti.com>
Cc: Sergej Sawazki <ce3a@gmx.de>
Fixes: 0a4807c2 ("clk: Make of_clk_get_parent_name() robust with #clock-cells = 1")
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 8005c49d

drivers/clk/clk-gpio.c

+17 −16
Original line number Diff line number Diff line
@@ -209,6 +209,8 @@ EXPORT_SYMBOL_GPL(clk_register_gpio_mux); 


struct clk_gpio_delayed_register_data {

	const char *gpio_name;

	int num_parents;

	const char **parent_names;

	struct device_node *node;

	struct mutex lock;

	struct clk *clk;
@@ -222,8 +224,6 @@ static struct clk *of_clk_gpio_delayed_register_get( 
{

	struct clk_gpio_delayed_register_data *data = _data;

	struct clk *clk;

	const char **parent_names;

	int i, num_parents;

	int gpio;

	enum of_gpio_flags of_flags;
@@ -248,26 +248,14 @@ static struct clk *of_clk_gpio_delayed_register_get( 
		return ERR_PTR(gpio);

	}



	num_parents = of_clk_get_parent_count(data->node);



	parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL);

	if (!parent_names) {

		clk = ERR_PTR(-ENOMEM);

		goto out;

	}



	for (i = 0; i < num_parents; i++)

		parent_names[i] = of_clk_get_parent_name(data->node, i);



	clk = data->clk_register_get(data->node->name, parent_names,

			num_parents, gpio, of_flags & OF_GPIO_ACTIVE_LOW);

	clk = data->clk_register_get(data->node->name, data->parent_names,

			data->num_parents, gpio, of_flags & OF_GPIO_ACTIVE_LOW);

	if (IS_ERR(clk))

		goto out;



	data->clk = clk;

out:

	mutex_unlock(&data->lock);

	kfree(parent_names);



	return clk;

}
@@ -296,11 +284,24 @@ static void __init of_gpio_clk_setup(struct device_node *node, 
				unsigned gpio, bool active_low))

{

	struct clk_gpio_delayed_register_data *data;

	const char **parent_names;

	int i, num_parents;



	data = kzalloc(sizeof(*data), GFP_KERNEL);

	if (!data)

		return;



	num_parents = of_clk_get_parent_count(node);



	parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL);

	if (!parent_names)

		return;



	for (i = 0; i < num_parents; i++)

		parent_names[i] = of_clk_get_parent_name(node, i);



	data->num_parents = num_parents;

	data->parent_names = parent_names;

	data->node = node;

	data->gpio_name = gpio_name;

	data->clk_register_get = clk_register_get;