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clk: gpio: Get parent clk names in of_gpio_clk_setup()

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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: Jyri Sarha <jsarha@ti.com>
Cc: Sergej Sawazki <ce3a@gmx.de>
Fixes: 0a4807c2f9 ("clk: Make of_clk_get_parent_name() robust with #clock-cells = 1")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Jyri Sarha 2015-11-17 11:56:44 +02:00 committed by Stephen Boyd
parent 8005c49d9a
commit f66541ba02
1 changed files with 17 additions and 16 deletions
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33
drivers/clk/clk-gpio.c
View file

@ -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;