1c66ec88fSEmmanuel Vadot* LPDDR3 SDRAM memories compliant to JEDEC JESD209-3C 2c66ec88fSEmmanuel Vadot 3c66ec88fSEmmanuel VadotRequired properties: 4c66ec88fSEmmanuel Vadot- compatible : Should be "<vendor>,<type>", and generic value "jedec,lpddr3". 5c66ec88fSEmmanuel Vadot Example "<vendor>,<type>" values: 6c66ec88fSEmmanuel Vadot "samsung,K3QF2F20DB" 7c66ec88fSEmmanuel Vadot 8c66ec88fSEmmanuel Vadot- density : <u32> representing density in Mb (Mega bits) 9c66ec88fSEmmanuel Vadot- io-width : <u32> representing bus width. Possible values are 8, 16, 32, 64 10c66ec88fSEmmanuel Vadot- #address-cells: Must be set to 1 11c66ec88fSEmmanuel Vadot- #size-cells: Must be set to 0 12c66ec88fSEmmanuel Vadot 13c66ec88fSEmmanuel VadotOptional properties: 14c66ec88fSEmmanuel Vadot 15*2eb4d8dcSEmmanuel Vadot- manufacturer-id : <u32> Manufacturer ID value read from Mode Register 5 16*2eb4d8dcSEmmanuel Vadot- revision-id : <u32 u32> Revision IDs read from Mode Registers 6 and 7 17*2eb4d8dcSEmmanuel Vadot 18c66ec88fSEmmanuel VadotThe following optional properties represent the minimum value of some AC 19c66ec88fSEmmanuel Vadottiming parameters of the DDR device in terms of number of clock cycles. 20c66ec88fSEmmanuel VadotThese values shall be obtained from the device data-sheet. 21c66ec88fSEmmanuel Vadot- tRFC-min-tck 22c66ec88fSEmmanuel Vadot- tRRD-min-tck 23c66ec88fSEmmanuel Vadot- tRPab-min-tck 24c66ec88fSEmmanuel Vadot- tRPpb-min-tck 25c66ec88fSEmmanuel Vadot- tRCD-min-tck 26c66ec88fSEmmanuel Vadot- tRC-min-tck 27c66ec88fSEmmanuel Vadot- tRAS-min-tck 28c66ec88fSEmmanuel Vadot- tWTR-min-tck 29c66ec88fSEmmanuel Vadot- tWR-min-tck 30c66ec88fSEmmanuel Vadot- tRTP-min-tck 31c66ec88fSEmmanuel Vadot- tW2W-C2C-min-tck 32c66ec88fSEmmanuel Vadot- tR2R-C2C-min-tck 33c66ec88fSEmmanuel Vadot- tWL-min-tck 34c66ec88fSEmmanuel Vadot- tDQSCK-min-tck 35c66ec88fSEmmanuel Vadot- tRL-min-tck 36c66ec88fSEmmanuel Vadot- tFAW-min-tck 37c66ec88fSEmmanuel Vadot- tXSR-min-tck 38c66ec88fSEmmanuel Vadot- tXP-min-tck 39c66ec88fSEmmanuel Vadot- tCKE-min-tck 40c66ec88fSEmmanuel Vadot- tCKESR-min-tck 41c66ec88fSEmmanuel Vadot- tMRD-min-tck 42c66ec88fSEmmanuel Vadot 43c66ec88fSEmmanuel VadotChild nodes: 44c66ec88fSEmmanuel Vadot- The lpddr3 node may have one or more child nodes of type "lpddr3-timings". 45c66ec88fSEmmanuel Vadot "lpddr3-timings" provides AC timing parameters of the device for 46c66ec88fSEmmanuel Vadot a given speed-bin. Please see Documentation/devicetree/ 47c66ec88fSEmmanuel Vadot bindings/ddr/lpddr3-timings.txt for more information on "lpddr3-timings" 48c66ec88fSEmmanuel Vadot 49c66ec88fSEmmanuel VadotExample: 50c66ec88fSEmmanuel Vadot 51c66ec88fSEmmanuel Vadotsamsung_K3QF2F20DB: lpddr3 { 52c66ec88fSEmmanuel Vadot compatible = "samsung,K3QF2F20DB", "jedec,lpddr3"; 53c66ec88fSEmmanuel Vadot density = <16384>; 54c66ec88fSEmmanuel Vadot io-width = <32>; 55*2eb4d8dcSEmmanuel Vadot manufacturer-id = <1>; 56*2eb4d8dcSEmmanuel Vadot revision-id = <123 234>; 57c66ec88fSEmmanuel Vadot #address-cells = <1>; 58c66ec88fSEmmanuel Vadot #size-cells = <0>; 59c66ec88fSEmmanuel Vadot 60c66ec88fSEmmanuel Vadot tRFC-min-tck = <17>; 61c66ec88fSEmmanuel Vadot tRRD-min-tck = <2>; 62c66ec88fSEmmanuel Vadot tRPab-min-tck = <2>; 63c66ec88fSEmmanuel Vadot tRPpb-min-tck = <2>; 64c66ec88fSEmmanuel Vadot tRCD-min-tck = <3>; 65c66ec88fSEmmanuel Vadot tRC-min-tck = <6>; 66c66ec88fSEmmanuel Vadot tRAS-min-tck = <5>; 67c66ec88fSEmmanuel Vadot tWTR-min-tck = <2>; 68c66ec88fSEmmanuel Vadot tWR-min-tck = <7>; 69c66ec88fSEmmanuel Vadot tRTP-min-tck = <2>; 70c66ec88fSEmmanuel Vadot tW2W-C2C-min-tck = <0>; 71c66ec88fSEmmanuel Vadot tR2R-C2C-min-tck = <0>; 72c66ec88fSEmmanuel Vadot tWL-min-tck = <8>; 73c66ec88fSEmmanuel Vadot tDQSCK-min-tck = <5>; 74c66ec88fSEmmanuel Vadot tRL-min-tck = <14>; 75c66ec88fSEmmanuel Vadot tFAW-min-tck = <5>; 76c66ec88fSEmmanuel Vadot tXSR-min-tck = <12>; 77c66ec88fSEmmanuel Vadot tXP-min-tck = <2>; 78c66ec88fSEmmanuel Vadot tCKE-min-tck = <2>; 79c66ec88fSEmmanuel Vadot tCKESR-min-tck = <2>; 80c66ec88fSEmmanuel Vadot tMRD-min-tck = <5>; 81c66ec88fSEmmanuel Vadot 82c66ec88fSEmmanuel Vadot timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 { 83c66ec88fSEmmanuel Vadot compatible = "jedec,lpddr3-timings"; 84c66ec88fSEmmanuel Vadot /* workaround: 'reg' shows max-freq */ 85c66ec88fSEmmanuel Vadot reg = <800000000>; 86c66ec88fSEmmanuel Vadot min-freq = <100000000>; 87c66ec88fSEmmanuel Vadot tRFC = <65000>; 88c66ec88fSEmmanuel Vadot tRRD = <6000>; 89c66ec88fSEmmanuel Vadot tRPab = <12000>; 90c66ec88fSEmmanuel Vadot tRPpb = <12000>; 91c66ec88fSEmmanuel Vadot tRCD = <10000>; 92c66ec88fSEmmanuel Vadot tRC = <33750>; 93c66ec88fSEmmanuel Vadot tRAS = <23000>; 94c66ec88fSEmmanuel Vadot tWTR = <3750>; 95c66ec88fSEmmanuel Vadot tWR = <7500>; 96c66ec88fSEmmanuel Vadot tRTP = <3750>; 97c66ec88fSEmmanuel Vadot tW2W-C2C = <0>; 98c66ec88fSEmmanuel Vadot tR2R-C2C = <0>; 99c66ec88fSEmmanuel Vadot tFAW = <25000>; 100c66ec88fSEmmanuel Vadot tXSR = <70000>; 101c66ec88fSEmmanuel Vadot tXP = <3750>; 102c66ec88fSEmmanuel Vadot tCKE = <3750>; 103c66ec88fSEmmanuel Vadot tCKESR = <3750>; 104c66ec88fSEmmanuel Vadot tMRD = <7000>; 105c66ec88fSEmmanuel Vadot }; 106c66ec88fSEmmanuel Vadot} 107