clk: add of_clk_src_onecell_get() support
For those SoCs that have hundreds of clock outputs, their clock
DT bindings could reasonably define #clock-cells as 1 and require
the client device specify the index of the clock it consumes in the
cell of its "clocks" phandle.
Add a generic of_clk_src_onecell_get() function for this purpose.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d9cbae0..56e4495e 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1587,6 +1587,20 @@
}
EXPORT_SYMBOL_GPL(of_clk_src_simple_get);
+struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data)
+{
+ struct clk_onecell_data *clk_data = data;
+ unsigned int idx = clkspec->args[0];
+
+ if (idx >= clk_data->clk_num) {
+ pr_err("%s: invalid clock index %d\n", __func__, idx);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return clk_data->clks[idx];
+}
+EXPORT_SYMBOL_GPL(of_clk_src_onecell_get);
+
/**
* of_clk_add_provider() - Register a clock provider for a node
* @np: Device node pointer associated with clock provider
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 1b15307..c127315 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -361,6 +361,11 @@
void of_clk_del_provider(struct device_node *np);
struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
void *data);
+struct clk_onecell_data {
+ struct clk **clks;
+ unsigned int clk_num;
+};
+struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
const char *of_clk_get_parent_name(struct device_node *np, int index);
void of_clk_init(const struct of_device_id *matches);