From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@xxxxxxx> Hi, These are few updates to existing device tree binding and the PM/OPP library to support sharing of OPPs between different device nodes. Currently all the cpu nodes are parsed until the OPPs are found. This is essential to support cpuhotplug without having to replicate OPP information in all the cpu nodes. However in systems with multiple cpu power domain, its better to have OPP entry for each cpu. To avoid replication, phandle can be specified to the node which contains the full OPP information. An RFC version was posted [1] and based on the discussion it was preferred to use phandle to a shared OPP table in a separate node rather than creating indirect linkage to the device with which it share the clock as it could be problematic. E.g. the bootloaders can remove cpu nodes if there are not used. Also I am retaining 'operating-points-phandle' property name, as it makes more sense now. The table node containing all the OPPs and device nodes pointing to an entry into it through phandle might also solve the problem of describing multiple OPP profiles. Regards, Sudeep [1] http://www.spinics.net/lists/cpufreq/msg06524.html Sudeep KarkadaNagesha (3): PM / OPP: extend DT binding to specify phandle of another node for OPP PM / OPP: add support to specify phandle of another node for OPP PM / OPP: check for existing OPP list when initialising from device tree Documentation/devicetree/bindings/power/opp.txt | 152 ++++++++++++++++++++++-- drivers/base/power/opp.c | 18 ++- 2 files changed, 156 insertions(+), 14 deletions(-) -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
