linux-kernel - [PATCH RFC 1/3] clk: of: helper for determining number of parent clocks

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Message-Id: <1370281990-15090-2-git-send-email-mturquette@linaro.org>
Date:	Mon,  3 Jun 2013 10:53:08 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org,
	Mike Turquette <mturquette@...aro.org>
Subject: [PATCH RFC 1/3] clk: of: helper for determining number of parent clocks

Walks the "clocks" array of parent clock phandles and returns the
number.

Signed-off-by: Mike Turquette <mturquette@...aro.org>
---
DT gurus, please let me know if this is stupid.  I am unfamiliar with
parsing DT blobs and associated APIs.

 drivers/clk/clk.c            | 6 ++++++
 include/linux/clk-provider.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index af0dbcc..73e0358 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2082,6 +2082,12 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
 	return clk;
 }
 
+int of_clk_get_parent_count(struct device_node *np)
+{
+	return of_count_phandle_with_args(np, "clocks", "#clock-cells");
+}
+EXPORT_SYMBOL_GPL(of_clk_get_parent_count);
+
 const char *of_clk_get_parent_name(struct device_node *np, int index)
 {
 	struct of_phandle_args clkspec;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 265f384..f8d38f2 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -442,6 +442,7 @@ 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 *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
+int of_clk_get_parent_count(struct device_node *np);
 const char *of_clk_get_parent_name(struct device_node *np, int index);
 
 void of_clk_init(const struct of_device_id *matches);
-- 
1.8.1.2

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