clk: Add of_clk_get_by_clkspec() helper

 */

#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)

struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec);

struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec);

void of_clk_lock(void);

void of_clk_unlock(void);

static DEFINE_MUTEX(clocks_mutex);

#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)

/**

 * of_clk_get_by_clkspec() - Lookup a clock form a clock provider

 * @clkspec: pointer to a clock specifier data structure

 *

 * This function looks up a struct clk from the registered list of clock

 * providers, an input is a clock specifier data structure as returned

 * from the of_parse_phandle_with_args() function call.

 */

struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec)

{

	struct clk *clk;

	if (!clkspec)

		return ERR_PTR(-EINVAL);

	of_clk_lock();

	clk = __of_clk_get_from_provider(clkspec);

	if (!IS_ERR(clk) && !__clk_get(clk))

		clk = ERR_PTR(-ENOENT);

	of_clk_unlock();

	return clk;

}

struct clk *of_clk_get(struct device_node *np, int index)

{

	struct of_phandle_args clkspec;

	if (rc)

		return ERR_PTR(rc);

	of_clk_lock();

	clk = __of_clk_get_from_provider(&clkspec);

	if (!IS_ERR(clk) && !__clk_get(clk))

		clk = ERR_PTR(-ENOENT);

	of_clk_unlock();

	clk = of_clk_get_by_clkspec(&clkspec);

	of_node_put(clkspec.np);

	return clk;

}