cpufreq-st.txt

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    1 Binding for ST's CPUFreq driver
    2 ===============================
    3 
    4 ST's CPUFreq driver attempts to read 'process' and 'version' attributes
    5 from the SoC, then supplies the OPP framework with 'prop' and 'supported
    6 hardware' information respectively.  The framework is then able to read
    7 the DT and operate in the usual way.
    8 
    9 Frequency Scaling only
   10 ----------------------
   11 
   12 No vendor specific driver required for this.
   13 
   14 Located in CPU's node:
   15 
   16 - operating-points              : [See: ../power/opp-v1.yaml]
   17 
   18 Example [safe]
   19 --------------
   20 
   21 cpus {
   22         cpu@0 {
   23                                  /* kHz     uV   */
   24                 operating-points = <1500000 0
   25                                     1200000 0
   26                                     800000  0
   27                                     500000  0>;
   28         };
   29 };
   30 
   31 Dynamic Voltage and Frequency Scaling (DVFS)
   32 --------------------------------------------
   33 
   34 This requires the ST CPUFreq driver to supply 'process' and 'version' info.
   35 
   36 Located in CPU's node:
   37 
   38 - operating-points-v2           : [See ../power/opp-v2.yaml]
   39 
   40 Example [unsafe]
   41 ----------------
   42 
   43 cpus {
   44         cpu@0 {
   45                 operating-points-v2     = <&cpu0_opp_table>;
   46         };
   47 };
   48 
   49 cpu0_opp_table: opp_table {
   50         compatible = "operating-points-v2";
   51 
   52         /* ############################################################### */
   53         /* # WARNING: Do not attempt to copy/replicate these nodes,      # */
   54         /* #          they are only to be supplied by the bootloader !!! # */
   55         /* ############################################################### */
   56         opp0 {
   57                 /*                         Major       Minor       Substrate */
   58                 /*                         2           all         all       */
   59                 opp-supported-hw        = <0x00000004  0xffffffff  0xffffffff>;
   60                 opp-hz                  = /bits/ 64 <1500000000>;
   61                 clock-latency-ns        = <10000000>;
   62 
   63                 opp-microvolt-pcode0    = <1200000>;
   64                 opp-microvolt-pcode1    = <1200000>;
   65                 opp-microvolt-pcode2    = <1200000>;
   66                 opp-microvolt-pcode3    = <1200000>;
   67                 opp-microvolt-pcode4    = <1170000>;
   68                 opp-microvolt-pcode5    = <1140000>;
   69                 opp-microvolt-pcode6    = <1100000>;
   70                 opp-microvolt-pcode7    = <1070000>;
   71         };
   72 
   73         opp1 {
   74                 /*                         Major       Minor       Substrate */
   75                 /*                         all         all         all       */
   76                 opp-supported-hw        = <0xffffffff  0xffffffff  0xffffffff>;
   77                 opp-hz                  = /bits/ 64 <1200000000>;
   78                 clock-latency-ns        = <10000000>;
   79 
   80                 opp-microvolt-pcode0    = <1110000>;
   81                 opp-microvolt-pcode1    = <1150000>;
   82                 opp-microvolt-pcode2    = <1100000>;
   83                 opp-microvolt-pcode3    = <1080000>;
   84                 opp-microvolt-pcode4    = <1040000>;
   85                 opp-microvolt-pcode5    = <1020000>;
   86                 opp-microvolt-pcode6    = <980000>;
   87                 opp-microvolt-pcode7    = <930000>;
   88         };
   89 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/cpufreq/cpufreq-st.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/cpufreq/cpufreq-st.txt