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clk: Port two helper functions from Linux 

Port of_clk_get_parent_count() and of_clk_parent_fill() from Linux.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Andrey Smirnov 2017-03-08 14:08:55 -08:00 committed by Sascha Hauer
parent da1752b370
commit b5ea2c6acc
2 changed files with 42 additions and 0 deletions
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39
drivers/clk/clk.c
View File

@ -452,6 +452,24 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
return clk;
}
/**
* of_clk_get_parent_count() - Count the number of clocks a device node has
* @np: device node to count
*
* Returns: The number of clocks that are possible parents of this node
*/
unsigned int of_clk_get_parent_count(struct device_node *np)
{
int count;
count = of_count_phandle_with_args(np, "clocks", "#clock-cells");
if (count < 0)
return 0;
return count;
}
EXPORT_SYMBOL_GPL(of_clk_get_parent_count);
char *of_clk_get_parent_name(struct device_node *np, unsigned int index)
{
struct of_phandle_args clkspec;
@ -472,6 +490,27 @@ char *of_clk_get_parent_name(struct device_node *np, unsigned int index)
}
EXPORT_SYMBOL_GPL(of_clk_get_parent_name);
/**
* of_clk_parent_fill() - Fill @parents with names of @np's parents and return
* number of parents
* @np: Device node pointer associated with clock provider
* @parents: pointer to char array that hold the parents' names
* @size: size of the @parents array
*
* Return: number of parents for the clock node.
*/
int of_clk_parent_fill(struct device_node *np, const char **parents,
unsigned int size)
{
unsigned int i = 0;
while (i < size && (parents[i] = of_clk_get_parent_name(np, i)) != NULL)
i++;
return i;
}
EXPORT_SYMBOL_GPL(of_clk_parent_fill);
struct clock_provider {
of_clk_init_cb_t clk_init_cb;
struct device_node *np;

3
include/linux/clk.h
View File

@ -348,7 +348,10 @@ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec, void *data);
struct clk *of_clk_get(struct device_node *np, int index);
struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
unsigned int of_clk_get_parent_count(struct device_node *np);
char *of_clk_get_parent_name(struct device_node *np, unsigned int index);
int of_clk_parent_fill(struct device_node *np, const char **parents,
unsigned int size);
int of_clk_init(struct device_node *root, const struct of_device_id *matches);
#else
static inline struct clk *of_clk_get(struct device_node *np, int index)