This patch adds a device tree binding for the simple fixed factor clock divider/multiplier of the common clock tree binding. Signed-off-by: Christian Ruppert <christian.ruppert@xxxxxxxxxx> --- .../bindings/clock/fixed-factor-clkdiv.txt | 24 +++++++++++++++ drivers/clk/clk-fixed-factor.c | 32 ++++++++++++++++++++ include/linux/clk-provider.h | 1 + 3 files changed, 57 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/clock/fixed-factor-clkdiv.txt diff --git a/Documentation/devicetree/bindings/clock/fixed-factor-clkdiv.txt b/Documentation/devicetree/bindings/clock/fixed-factor-clkdiv.txt new file mode 100644 index 0000000..352bac4 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/fixed-factor-clkdiv.txt @@ -0,0 +1,24 @@ +Device Tree Clock bindings for plat-tb10x + +This binding uses the common clock binding[1]. + +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt + +Required properties: +- compatible : shall be "fixed-factor-clkdiv" +- #clock-cells: from common clock binding; shall be set to 0 +- clocks: shall be the input parent clock phandle for the clock. +- clock-mult: defines the multiplication factor of the output clock frequency + wrt. the input clock frequency. +- clock-div: defines the division factor of the output clock frequency wrt. + the input clock frequency. + +Example: +cpu_clk: clkdiv_cpu { /* CPU clock derived from pll0. 1/2 of pll frequency */ + compatible = "fixed-factor-clkdiv"; + #clock-cells = <0>; + clocks = <&pll0>; + clock-mult = <1>; + clock-div = <2>; + clock-output-names = "cpu_clk"; +}; diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c index 1ef271e..85e45f1 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 @@ -96,3 +97,34 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name, return clk; } + +#ifdef CONFIG_OF +/** + * of_fixed_factor_clkdiv_setup() - Set up simple fixed factor clock divider + */ +void of_fixed_factor_clkdiv_setup(struct device_node *node) +{ + struct clk *clk; + const char *clk_name = node->name; + const char *parent_name; + u32 mult, div; + + if (of_property_read_u32(node, "clock-mult", &mult)) + return; + + if (of_property_read_u32(node, "clock-div", &div)) + return; + + parent_name = of_clk_get_parent_name(node, 0); + + of_property_read_string(node, "clock-output-names", &clk_name); + + clk = clk_register_fixed_factor(NULL, clk_name, parent_name, 0, + mult, div); + if (!IS_ERR(clk)) + of_clk_add_provider(node, of_clk_src_simple_get, clk); +} +EXPORT_SYMBOL_GPL(of_fixed_factor_clkdiv_setup); +CLK_OF_DECLARE(fixed_clkdiv, "fixed-factor-clkdiv", + of_fixed_factor_clkdiv_setup); +#endif diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 7f197d7..d4937cf 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -184,6 +184,7 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, unsigned long fixed_rate); void of_fixed_clk_setup(struct device_node *np); +void of_fixed_factor_clkdiv_setup(struct device_node *node); /** * struct clk_gate - gating clock -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html