lpddr2-timings.txt

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    1 * AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin
    2 
    3 Required properties:
    4 - compatible : Should be "jedec,lpddr2-timings"
    5 - min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32>
    6 - max-freq : maximum DDR clock frequency for the speed-bin. Type is <u32>
    7 
    8 Optional properties:
    9 
   10 The following properties represent AC timing parameters from the memory
   11 data-sheet of the device for a given speed-bin. All these properties are
   12 of type <u32> and the default unit is ps (pico seconds). Parameters with
   13 a different unit have a suffix indicating the unit such as 'tRAS-max-ns'
   14 - tRCD
   15 - tWR
   16 - tRAS-min
   17 - tRRD
   18 - tWTR
   19 - tXP
   20 - tRTP
   21 - tDQSCK-max
   22 - tFAW
   23 - tZQCS
   24 - tZQinit
   25 - tRPab
   26 - tZQCL
   27 - tCKESR
   28 - tRAS-max-ns
   29 - tDQSCK-max-derated
   30 
   31 Example:
   32 
   33 timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 {
   34         compatible      = "jedec,lpddr2-timings";
   35         min-freq        = <10000000>;
   36         max-freq        = <400000000>;
   37         tRPab           = <21000>;
   38         tRCD            = <18000>;
   39         tWR             = <15000>;
   40         tRAS-min        = <42000>;
   41         tRRD            = <10000>;
   42         tWTR            = <7500>;
   43         tXP             = <7500>;
   44         tRTP            = <7500>;
   45         tCKESR          = <15000>;
   46         tDQSCK-max      = <5500>;
   47         tFAW            = <50000>;
   48         tZQCS           = <90000>;
   49         tZQCL           = <360000>;
   50         tZQinit         = <1000000>;
   51         tRAS-max-ns     = <70000>;
   52 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/ddr/lpddr2-timings.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/ddr/lpddr2-timings.txt