On Tue, Dec 08, 2015 at 02:32:03PM +0000, Lee Jones wrote: > Cc: [email protected] > Signed-off-by: Lee Jones <[email protected]>
Acked-by: Rob Herring <[email protected]> > --- > .../devicetree/bindings/cpufreq/cpufreq-st.txt | 91 > ++++++++++++++++++++++ > 1 file changed, 91 insertions(+) > create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt > > diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt > b/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt > new file mode 100644 > index 0000000..d91a02a > --- /dev/null > +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt > @@ -0,0 +1,91 @@ > +Binding for ST's CPUFreq driver > +=============================== > + > +ST's CPUFreq driver attempts to read 'process' and 'version' attributes > +from the SoC, then supplies the OPP framework with 'prop' and 'supported > +hardware' information respectively. The framework is then able to read > +the DT and operate in the usual way. > + > +For more information about the expected DT format [See: ../opp/opp.txt]. > + > +Frequency Scaling only > +---------------------- > + > +No vendor specific driver required for this. > + > +Located in CPU's node: > + > +- operating-points : [See: ../power/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) > +-------------------------------------------- > + > +This requires the ST CPUFreq driver to supply 'process' and 'version' info. > + > +Located in CPU's node: > + > +- operating-points-v2 : [See ../power/opp.txt] > + > +Example [unsafe] > +---------------- > + > +cpus { > + cpu@0 { > + operating-points-v2 = <&cpu0_opp_table>; > + }; > +}; > + > +cpu0_opp_table: opp_table { > + compatible = "operating-points-v2"; > + > + /* ############################################################### */ > + /* # WARNING: Do not attempt to copy/replicate these nodes, # */ > + /* # they are only to be supplied by the bootloader !!! # */ > + /* ############################################################### */ > + opp0 { > + /* Major Minor Substrate */ > + /* 2 all all */ > + opp-supported-hw = <0x00000004 0xffffffff 0xffffffff>; > + opp-hz = /bits/ 64 <1500000000>; > + clock-latency-ns = <10000000>; > + > + opp-microvolt-pcode0 = <1200000>; > + opp-microvolt-pcode1 = <1200000>; > + opp-microvolt-pcode2 = <1200000>; > + opp-microvolt-pcode3 = <1200000>; > + opp-microvolt-pcode4 = <1170000>; > + opp-microvolt-pcode5 = <1140000>; > + opp-microvolt-pcode6 = <1100000>; > + opp-microvolt-pcode7 = <1070000>; > + }; > + > + opp1 { > + /* Major Minor Substrate */ > + /* all all all */ > + opp-supported-hw = <0xffffffff 0xffffffff 0xffffffff>; > + opp-hz = /bits/ 64 <1200000000>; > + clock-latency-ns = <10000000>; > + > + opp-microvolt-pcode0 = <1110000>; > + opp-microvolt-pcode1 = <1150000>; > + opp-microvolt-pcode2 = <1100000>; > + opp-microvolt-pcode3 = <1080000>; > + opp-microvolt-pcode4 = <1040000>; > + opp-microvolt-pcode5 = <1020000>; > + opp-microvolt-pcode6 = <980000>; > + opp-microvolt-pcode7 = <930000>; > + }; > +}; > -- > 1.9.1 > > -- > To unsubscribe from this list: send the line "unsubscribe devicetree" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
