1* AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin 2 3Required 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 8Optional properties: 9 10The following properties represent AC timing parameters from the memory 11data-sheet of the device for a given speed-bin. All these properties are 12of type <u32> and the default unit is ps (pico seconds). Parameters with 13a 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 31Example: 32 33timings_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}; 53