Hi Christian, On 04/10/2013 05:40 PM, Christian Ruppert wrote: > This patch adds a device tree binding for the simple fixed factor clock > divider/multiplier of the common clock tree binding. This patch remind me of something : http://lists.infradead.org/pipermail/linux-arm-kernel/2012-August/116405.html Do you have a use case for it, this time? My version have been hold off waiting for an user for it. Will you need it for a driver? Regards, > > 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 > -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- 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
