[PATCH] clk: add DT fixed-factor-clock binding support
From: Gregory CLEMENT <hidden>
Date: 2012-08-28 22:53:02
Also in:
linux-arm-kernel
Subsystem:
common clk framework, open firmware and flattened device tree bindings, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Add support for DT "fixed-factor-clock" binding to the common fixed factor clock support. Signed-off-by: Gregory CLEMENT <redacted> Cc: Grant Likely <redacted> Cc: Rob Herring <redacted> Cc: Mike Turquette <redacted> Cc: Shawn Guo <redacted> --- .../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
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1.7.9.5