Cc'ing few people (whom I cc'd last time as well :)). On 27-07-15, 16:20, Lee Jones wrote: > These OPPs are used in ST's CPUFreq implementation. > > Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> > --- > > Changelog: > - None, new patch > > Documentation/devicetree/bindings/power/opp-st.txt | 76 ++++++++++++++++++++++ > 1 file changed, 76 insertions(+) > create mode 100644 Documentation/devicetree/bindings/power/opp-st.txt > > diff --git a/Documentation/devicetree/bindings/power/opp-st.txt b/Documentation/devicetree/bindings/power/opp-st.txt > new file mode 100644 > index 0000000..6eb2a91 > --- /dev/null > +++ b/Documentation/devicetree/bindings/power/opp-st.txt > @@ -0,0 +1,76 @@ > +STMicroelectronics OPP (Operating Performance Points) Bindings > +-------------------------------------------------------------- > + > +Frequency Scaling only > +---------------------- > + > +Located in CPU's node: > + > +- operating-points : [See: ./opp.txt] > + > +Example [safe] > +-------------- > + > +cpus { > + cpu@0 { > + /* kHz uV */ > + operating-points = <1500000 0 > + 1200000 0 > + 800000 0 > + 500000 0>; > + }; > +}; > + > +Dynamic Voltage and Frequency Scaling (DVFS) > +-------------------------------------------- > + > +Located in 'cpu0-opp-list' node [to be provided ONLY by the bootloader]: > + > +- compatible : Should be "operating-points-v2-sti" > +- opp{1..N} : Each 'oppX' subnode will contain the following properties: Or should we mention: - opp{1..N} : Each 'oppX' subnode shall contain below properties, over what ./opp.txt defines: ? > + - opp-hz : CPU frequency [Hz] for this OPP [See: ./opp.txt] > + - st,avs : List of available voltages [uV] indexed by process code > + - st,cuts : Cut version this OPP is suitable for [0xFF means ALL] > + - st,substrate : Substrate version this OPP is suitable for [0xFF means ALL] > +- st,syscfg : Phandle to Major number register > + First cell: offset to major number > +- st,syscfg-eng : Phandle to Minor number and Pcode registers > + First cell: offset to process code > + Second cell: offset to minor number > + > +WARNING: The opp{1..N} nodes will be provided by the bootloader. Do not attempt to > + artificially synthesise the opp{1..N} nodes or any of their descendants. > + They are very platform specific and may damage the hardware if created > + incorrectly. > + > +Example [unsafe] > +---------------- > + > +cpus { > + cpu@0 { > + operating-points-v2 = <&cpu0_opp_list>; > + }; > +}; > + > +/* ############################################################ */ > +/* # WARNING: Do not attempt to copy/replicate this node, # */ > +/* # it is only to be supplied by the bootloader !!! # */ > +/* ############################################################ */ > +cpu0-opp-list { > + compatible = "operating-points-v2-sti"; > + st,syscfg = <&syscfg [major_offset]>; > + st,syscfg-eng = <&syscfg_eng [pcode_offset] [minor_offset]>; > + > + opp0 { > + opp-hz = <1200000000>; > + st,avs = <1110 1150 1100 1080 1040 1020 980 930>; > + st,substrate = <0xff>; > + st,cuts = <0xff>; > + }; > + opp1 { > + opp-hz = <1500000000>; > + st,avs = <1200 1200 1200 1200 1170 1140 1100 1070>; > + st,substrate = <0xff>; > + st,cuts = <0x2>; > + }; > +}; I don't see more problems here, unless we can move some of this to the generic bindings. @Rob/Stephen: Please respond before it is late :) -- viresh -- 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