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Subject[RFC PATCH v2 1/2] clk: Add function parsing arbitrary clock list DT property
Date
The of_clk_get_by_property() function added by this patch is similar to
of_clk_get(), except it allows to pass name of a DT property containing
list of phandles and clock specifiers. For of_clk_get() this has been
hard coded to "clocks".

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
Changes since v1:
- s/of_clk_get_list_entry/of_clk_get_by_property.
---
drivers/clk/clk.h | 3 +++
drivers/clk/clkdev.c | 25 +++++++++++++++++++++----
2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/clk.h b/drivers/clk/clk.h
index 795cc9f..666bc50 100644
--- a/drivers/clk/clk.h
+++ b/drivers/clk/clk.h
@@ -10,7 +10,10 @@
*/

#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+
struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec);
void of_clk_lock(void);
void of_clk_unlock(void);
+struct clk *of_clk_get_by_property(struct device_node *np,
+ const char *list_name, int index);
#endif
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index a360b2e..1d41540 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -27,17 +27,28 @@ static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);

#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
-struct clk *of_clk_get(struct device_node *np, int index)
+/**
+ * of_clk_get_by_property() - Parse and lookup a clock referenced by a device node
+ * @np: pointer to clock consumer node
+ * @list_name: name of the clock list property
+ * @index: index to the clock list
+ *
+ * This function parses the @list_name property and together with @index
+ * value indicating an entry of the list uses it to look up the struct clk
+ * from the registered list of clock providers.
+ */
+struct clk *of_clk_get_by_property(struct device_node *np,
+ const char *list_name, int index)
{
struct of_phandle_args clkspec;
struct clk *clk;
int rc;

- if (index < 0)
+ if (index < 0 || !list_name)
return ERR_PTR(-EINVAL);

- rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
- &clkspec);
+ rc = of_parse_phandle_with_args(np, list_name, "#clock-cells",
+ index, &clkspec);
if (rc)
return ERR_PTR(rc);

@@ -51,6 +62,12 @@ struct clk *of_clk_get(struct device_node *np, int index)
of_node_put(clkspec.np);
return clk;
}
+EXPORT_SYMBOL(of_clk_get_by_property);
+
+struct clk *of_clk_get(struct device_node *np, int index)
+{
+ return of_clk_get_by_property(np, "clocks", index);
+}
EXPORT_SYMBOL(of_clk_get);

/**
--
1.7.9.5


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