lpddr3.txt

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    1 * LPDDR3 SDRAM memories compliant to JEDEC JESD209-3C
    2 
    3 Required properties:
    4 - compatible : Should be "<vendor>,<type>", and generic value "jedec,lpddr3".
    5   Example "<vendor>,<type>" values:
    6     "samsung,K3QF2F20DB"
    7 
    8 - density  : <u32> representing density in Mb (Mega bits)
    9 - io-width : <u32> representing bus width. Possible values are 8, 16, 32, 64
   10 - #address-cells: Must be set to 1
   11 - #size-cells: Must be set to 0
   12 
   13 Optional properties:
   14 
   15 - manufacturer-id : <u32>     Manufacturer ID value read from Mode Register 5
   16 - revision-id     : <u32 u32> Revision IDs read from Mode Registers 6 and 7
   17 
   18 The following optional properties represent the minimum value of some AC
   19 timing parameters of the DDR device in terms of number of clock cycles.
   20 These values shall be obtained from the device data-sheet.
   21 - tRFC-min-tck
   22 - tRRD-min-tck
   23 - tRPab-min-tck
   24 - tRPpb-min-tck
   25 - tRCD-min-tck
   26 - tRC-min-tck
   27 - tRAS-min-tck
   28 - tWTR-min-tck
   29 - tWR-min-tck
   30 - tRTP-min-tck
   31 - tW2W-C2C-min-tck
   32 - tR2R-C2C-min-tck
   33 - tWL-min-tck
   34 - tDQSCK-min-tck
   35 - tRL-min-tck
   36 - tFAW-min-tck
   37 - tXSR-min-tck
   38 - tXP-min-tck
   39 - tCKE-min-tck
   40 - tCKESR-min-tck
   41 - tMRD-min-tck
   42 
   43 Child nodes:
   44 - The lpddr3 node may have one or more child nodes of type "lpddr3-timings".
   45   "lpddr3-timings" provides AC timing parameters of the device for
   46   a given speed-bin. Please see Documentation/devicetree/
   47   bindings/ddr/lpddr3-timings.txt for more information on "lpddr3-timings"
   48 
   49 Example:
   50 
   51 samsung_K3QF2F20DB: lpddr3 {
   52         compatible      = "samsung,K3QF2F20DB", "jedec,lpddr3";
   53         density         = <16384>;
   54         io-width        = <32>;
   55         manufacturer-id = <1>;
   56         revision-id     = <123 234>;
   57         #address-cells  = <1>;
   58         #size-cells     = <0>;
   59 
   60         tRFC-min-tck            = <17>;
   61         tRRD-min-tck            = <2>;
   62         tRPab-min-tck           = <2>;
   63         tRPpb-min-tck           = <2>;
   64         tRCD-min-tck            = <3>;
   65         tRC-min-tck             = <6>;
   66         tRAS-min-tck            = <5>;
   67         tWTR-min-tck            = <2>;
   68         tWR-min-tck             = <7>;
   69         tRTP-min-tck            = <2>;
   70         tW2W-C2C-min-tck        = <0>;
   71         tR2R-C2C-min-tck        = <0>;
   72         tWL-min-tck             = <8>;
   73         tDQSCK-min-tck          = <5>;
   74         tRL-min-tck             = <14>;
   75         tFAW-min-tck            = <5>;
   76         tXSR-min-tck            = <12>;
   77         tXP-min-tck             = <2>;
   78         tCKE-min-tck            = <2>;
   79         tCKESR-min-tck          = <2>;
   80         tMRD-min-tck            = <5>;
   81 
   82         timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 {
   83                 compatible      = "jedec,lpddr3-timings";
   84                 /* workaround: 'reg' shows max-freq */
   85                 reg             = <800000000>;
   86                 min-freq        = <100000000>;
   87                 tRFC            = <65000>;
   88                 tRRD            = <6000>;
   89                 tRPab           = <12000>;
   90                 tRPpb           = <12000>;
   91                 tRCD            = <10000>;
   92                 tRC             = <33750>;
   93                 tRAS            = <23000>;
   94                 tWTR            = <3750>;
   95                 tWR             = <7500>;
   96                 tRTP            = <3750>;
   97                 tW2W-C2C        = <0>;
   98                 tR2R-C2C        = <0>;
   99                 tFAW            = <25000>;
  100                 tXSR            = <70000>;
  101                 tXP             = <3750>;
  102                 tCKE            = <3750>;
  103                 tCKESR          = <3750>;
  104                 tMRD            = <7000>;
  105         };
  106 }

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

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sys/contrib/device-tree/Bindings/ddr/lpddr3.txt