From: Rob Herring <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
---
drivers/of/clock.c | 24 ++++++++++++++++++++++++
include/linux/of_clk.h | 2 ++
2 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/drivers/of/clock.c b/drivers/of/clock.c
index f4a0965..8ad2dbd 100644
--- a/drivers/of/clock.c
+++ b/drivers/of/clock.c
@@ -128,6 +128,30 @@ struct clk *of_clk_get(struct device_node *np, int index)
return clk;
}
+const char *of_clk_get_parent_name(struct device_node *np, int index)
+{
+ struct of_phandle_args clkspec;
+ const char *clk_name;
+ int rc;
+
+ if (index < 0)
+ return NULL;
+
+ rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
+ &clkspec);
+ if (rc)
+ return NULL;
+
+ if (of_property_read_string_index(clkspec.np, "clock-output-names",
+ clkspec.args_count ? clkspec.args[0]
: 0,
+ &clk_name) < 0)
+ clk_name = clkspec.np->name;
+
+ of_node_put(clkspec.np);
+ return clk_name;
+}
+
+
/**
* of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
* @np: pointer to clock consumer node
diff --git a/include/linux/of_clk.h b/include/linux/of_clk.h
index 02ecc98..6a07071 100644
--- a/include/linux/of_clk.h
+++ b/include/linux/of_clk.h
@@ -22,6 +22,8 @@ void of_clk_del_provider(struct device_node *np);
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);
+const char *of_clk_get_parent_name(struct device_node *np, int index);
+
void of_clk_init(const struct of_device_id *matches);
extern void of_fixed_clk_setup(struct device_node *np);
--
1.7.5.4
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