On Tue, Mar 13, 2012 at 06:22:22PM -0500, Rob Herring wrote: > From: Grant Likely <[email protected]> > > Based on work by Ben Herrenschmidt and Jeremy Kerr, this patch adds an > of_clk_get function to allow platforms to retrieve clock data from the > device tree. > > Platform register a provider through of_clk_add_provider, which will be > called when a device references the provider's OF node for a clock > reference. > > v3: - Clarified documentation > > v2: - fixed errant ';' causing compile error > - Editorial fixes from Shawn Guo > - merged in adding lookup to clkdev > - changed property names to match established convention. After > working with the binding a bit it really made more sense to follow the > lead of 'reg', 'gpios' and 'interrupts' by making the input simply > 'clocks' & 'clock-names' instead of 'clock-input-*', and to only use > clock-output* for the producer nodes. (Sorry Shawn, this will mean > you need to change some code, but it should be trivial) > - Add ability to inherit clocks from parent nodes by using an empty > 'clock-ranges' property. Useful for busses. I could use some feedback > on the new property name, 'clock-ranges' doesn't feel right to me. > > Signed-off-by: Grant Likely <[email protected]> > Reviewed-by: Shawn Guo <[email protected]> > Cc: Rob Herring <[email protected]> > Cc: Sascha Hauer <[email protected]> > Cc: Mike Turquette <[email protected]> > --- > .../devicetree/bindings/clock/clock-bindings.txt | 116 ++++++++++++++ > .../devicetree/bindings/clock/fixed-clock.txt | 21 +++ > drivers/clk/clkdev.c | 9 + > drivers/of/Kconfig | 6 + > drivers/of/Makefile | 1 + > drivers/of/clock.c | 165 > ++++++++++++++++++++ > include/linux/of_clk.h | 37 +++++ > 7 files changed, 355 insertions(+), 0 deletions(-) > create mode 100644 Documentation/devicetree/bindings/clock/clock-bindings.txt > create mode 100644 Documentation/devicetree/bindings/clock/fixed-clock.txt > create mode 100644 drivers/of/clock.c > create mode 100644 include/linux/of_clk.h > > diff --git a/Documentation/devicetree/bindings/clock/clock-bindings.txt > b/Documentation/devicetree/bindings/clock/clock-bindings.txt > new file mode 100644 > index 0000000..3cb6746 > --- /dev/null > +++ b/Documentation/devicetree/bindings/clock/clock-bindings.txt > @@ -0,0 +1,116 @@ > +This binding is a work-in-progress, and are based on some experimental > +work by benh[1]. > + > +Sources of clock signal can be represented by any node in the device > +tree. Those nodes are designated as clock providers. Clock consumer > +nodes use a phandle and clock specifier pair to connect clock provider > +outputs to clock inputs. Similar to the gpio specifiers, a clock > +specifier is an array of one more more cells identifying the clock > +output on a device. The length of a clock specifier is defined by the > +value of a #clock-cells property in the clock provider node. > + > +[1] http://patchwork.ozlabs.org/patch/31551/ > + > +==Clock providers== > + > +Required properties: > +#clock-cells: Number of cells in a clock specifier; typically will > be > + set to 1 > +
We had a discussion[1] regarding it. Regards, Shawn http://article.gmane.org/gmane.linux.drivers.devicetree/11554 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
