lpddr3-timings.txt

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    1 * AC timing parameters of LPDDR3 memories for a given speed-bin.
    2 
    3 The structures are based on LPDDR2 and extended where needed.
    4 
    5 Required properties:
    6 - compatible : Should be "jedec,lpddr3-timings"
    7 - min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32>
    8 - reg : maximum DDR clock frequency for the speed-bin. Type is <u32>
    9 
   10 Optional properties:
   11 
   12 The following properties represent AC timing parameters from the memory
   13 data-sheet of the device for a given speed-bin. All these properties are
   14 of type <u32> and the default unit is ps (pico seconds).
   15 - tRFC
   16 - tRRD
   17 - tRPab
   18 - tRPpb
   19 - tRCD
   20 - tRC
   21 - tRAS
   22 - tWTR
   23 - tWR
   24 - tRTP
   25 - tW2W-C2C
   26 - tR2R-C2C
   27 - tFAW
   28 - tXSR
   29 - tXP
   30 - tCKE
   31 - tCKESR
   32 - tMRD
   33 
   34 Example:
   35 
   36 timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 {
   37         compatible      = "jedec,lpddr3-timings";
   38         reg             = <800000000>; /* workaround: it shows max-freq */
   39         min-freq        = <100000000>;
   40         tRFC            = <65000>;
   41         tRRD            = <6000>;
   42         tRPab           = <12000>;
   43         tRPpb           = <12000>;
   44         tRCD            = <10000>;
   45         tRC             = <33750>;
   46         tRAS            = <23000>;
   47         tWTR            = <3750>;
   48         tWR             = <7500>;
   49         tRTP            = <3750>;
   50         tW2W-C2C        = <0>;
   51         tR2R-C2C        = <0>;
   52         tFAW            = <25000>;
   53         tXSR            = <70000>;
   54         tXP             = <3750>;
   55         tCKE            = <3750>;
   56         tCKESR          = <3750>;
   57         tMRD            = <7000>;
   58 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/ddr/lpddr3-timings.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/ddr/lpddr3-timings.txt