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-   -   UBUNTU: (drop after 3.6-rc1) clk: add DT fixed-clock binding support (http://www.linux-archive.org/ubuntu-kernel-team/690118-ubuntu-drop-after-3-6-rc1-clk-add-dt-fixed-clock-binding-support.html)

Ike Panhc 08-03-2012 01:23 AM

UBUNTU: (drop after 3.6-rc1) clk: add DT fixed-clock binding support
 
From: Grant Likely <grant.likely@secretlab.ca>

BugLink: http://launchpad.net/bugs/1008345

Add support for DT "fixed-clock" binding to the common fixed rate clock
support.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
[Rob Herring] Rework and move into common clock infrastructure
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
(cherry picked from commit 015ba40246497ae02a5f644d4c8adfec76d9b75c)

Signed-off-by: Ike Panhc <ike.pan@canonical.com>
---
drivers/clk/clk-fixed-rate.c | 23 +++++++++++++++++++++++
include/linux/clk-provider.h | 2 ++
2 files changed, 25 insertions(+)

diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c
index cbd2462..94493f1 100644
--- a/drivers/clk/clk-fixed-rate.c
+++ b/drivers/clk/clk-fixed-rate.c
@@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/err.h>
+#include <linux/of.h>

/*
* DOC: basic fixed-rate clock that cannot gate
@@ -79,3 +80,25 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,

return clk;
}
+
+#ifdef CONFIG_OF
+/**
+ * of_fixed_clk_setup() - Setup function for simple fixed rate clock
+ */
+void __init of_fixed_clk_setup(struct device_node *node)
+{
+ struct clk *clk;
+ const char *clk_name = node->name;
+ u32 rate;
+
+ if (of_property_read_u32(node, "clock-frequency", &rate))
+ return;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+
+ clk = clk_register_fixed_rate(NULL, clk_name, NULL, CLK_IS_ROOT, rate);
+ if (clk)
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+}
+EXPORT_SYMBOL_GPL(of_fixed_clk_setup);
+#endif
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index acfef45..b97f61e 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -171,6 +171,8 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
unsigned long fixed_rate);

+void of_fixed_clk_setup(struct device_node *np);
+
/**
* struct clk_gate - gating clock
*
--
1.7.9.5


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