* [PATCH] clk: add DT fixed-factor-clock binding support
2012-08-28 22:53 [PATCH 0/1] clk: add DT fixed-factor-clock binding support Gregory CLEMENT
@ 2012-08-28 22:53 ` Gregory CLEMENT
2012-09-06 16:15 ` [PATCH 0/1] " Rob Herring
1 sibling, 0 replies; 4+ messages in thread
From: Gregory CLEMENT @ 2012-08-28 22:53 UTC (permalink / raw)
To: linux-arm-kernel
Add support for DT "fixed-factor-clock" binding to the common fixed
factor clock support.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Mike Turquette <mturquette@ti.com>
Cc: Shawn Guo <shawn.guo@freescale.com>
---
.../bindings/clock/fixed-factor-clock.txt | 24 ++++++++++++++
drivers/clk/clk-fixed-factor.c | 34 ++++++++++++++++++++
include/linux/clk-provider.h | 2 ++
3 files changed, 60 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/fixed-factor-clock.txt
diff --git a/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt b/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt
new file mode 100644
index 0000000..7ed236f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt
@@ -0,0 +1,24 @@
+Binding for simple fixed factor rate clock sources.
+
+This binding uses the common clock binding[1].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties:
+- compatible : shall be "fixed-factor-clock".
+- #clock-cells : from common clock binding; shall be set to 0.
+- div: fixed divider.
+- mult: fixed multiplier.
+- clocks: parent clock.
+
+Optional properties:
+- clock-output-names : From common clock binding.
+
+Example:
+ clock {
+ compatible = "fixed-factor-clock";
+ clocks = <&parentclk>;
+ #clock-cells = <0>;
+ div = <2>;
+ mult = <1>;
+ };
diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index a489985..8fdf5e9 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -11,6 +11,7 @@
#include <linux/clk-provider.h>
#include <linux/slab.h>
#include <linux/err.h>
+#include <linux/of.h>
/*
* DOC: basic fixed multiplier and divider clock that cannot gate
@@ -93,3 +94,36 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
return clk;
}
+#ifdef CONFIG_OF
+/**
+ * of_fixed_factor_clk_setup() - Setup function for simple fixed factor clock
+ */
+void __init of_fixed_factor_clk_setup(struct device_node *node)
+{
+ struct clk *clk;
+ const char *clk_name = node->name;
+ const char *parent_name;
+ u32 div, mult;
+
+ if (of_property_read_u32(node, "div", &div)) {
+ pr_err("%s Fixed factor clock <%s> must have a div property\n",
+ __func__, node->name);
+ return;
+ }
+
+ if (of_property_read_u32(node, "mult", &mult)) {
+ pr_err("%s Fixed factor clock <%s> must have a mult property\n",
+ __func__, node->name);
+ return;
+ }
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+ parent_name = of_clk_get_parent_name(node, 0);
+
+ clk = clk_register_fixed_factor(NULL, clk_name, parent_name, 0,
+ mult, div);
+ if (clk)
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+}
+EXPORT_SYMBOL_GPL(of_fixed_factor_clk_setup);
+#endif
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 77335fa..796e68b 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -314,6 +314,8 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
const char *parent_name, unsigned long flags,
unsigned int mult, unsigned int div);
+void of_fixed_factor_clk_setup(struct device_node *node);
+
/**
* clk_register - allocate a new clock, register it and return an opaque cookie
* @dev: device that is registering this clock
--
1.7.9.5
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