18c2ecf20Sopenharmony_ci* AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ciRequired properties: 48c2ecf20Sopenharmony_ci- compatible : Should be "jedec,lpddr2-timings" 58c2ecf20Sopenharmony_ci- min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32> 68c2ecf20Sopenharmony_ci- max-freq : maximum DDR clock frequency for the speed-bin. Type is <u32> 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ciOptional properties: 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciThe following properties represent AC timing parameters from the memory 118c2ecf20Sopenharmony_cidata-sheet of the device for a given speed-bin. All these properties are 128c2ecf20Sopenharmony_ciof type <u32> and the default unit is ps (pico seconds). Parameters with 138c2ecf20Sopenharmony_cia different unit have a suffix indicating the unit such as 'tRAS-max-ns' 148c2ecf20Sopenharmony_ci- tRCD 158c2ecf20Sopenharmony_ci- tWR 168c2ecf20Sopenharmony_ci- tRAS-min 178c2ecf20Sopenharmony_ci- tRRD 188c2ecf20Sopenharmony_ci- tWTR 198c2ecf20Sopenharmony_ci- tXP 208c2ecf20Sopenharmony_ci- tRTP 218c2ecf20Sopenharmony_ci- tDQSCK-max 228c2ecf20Sopenharmony_ci- tFAW 238c2ecf20Sopenharmony_ci- tZQCS 248c2ecf20Sopenharmony_ci- tZQinit 258c2ecf20Sopenharmony_ci- tRPab 268c2ecf20Sopenharmony_ci- tZQCL 278c2ecf20Sopenharmony_ci- tCKESR 288c2ecf20Sopenharmony_ci- tRAS-max-ns 298c2ecf20Sopenharmony_ci- tDQSCK-max-derated 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ciExample: 328c2ecf20Sopenharmony_ci 338c2ecf20Sopenharmony_citimings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 { 348c2ecf20Sopenharmony_ci compatible = "jedec,lpddr2-timings"; 358c2ecf20Sopenharmony_ci min-freq = <10000000>; 368c2ecf20Sopenharmony_ci max-freq = <400000000>; 378c2ecf20Sopenharmony_ci tRPab = <21000>; 388c2ecf20Sopenharmony_ci tRCD = <18000>; 398c2ecf20Sopenharmony_ci tWR = <15000>; 408c2ecf20Sopenharmony_ci tRAS-min = <42000>; 418c2ecf20Sopenharmony_ci tRRD = <10000>; 428c2ecf20Sopenharmony_ci tWTR = <7500>; 438c2ecf20Sopenharmony_ci tXP = <7500>; 448c2ecf20Sopenharmony_ci tRTP = <7500>; 458c2ecf20Sopenharmony_ci tCKESR = <15000>; 468c2ecf20Sopenharmony_ci tDQSCK-max = <5500>; 478c2ecf20Sopenharmony_ci tFAW = <50000>; 488c2ecf20Sopenharmony_ci tZQCS = <90000>; 498c2ecf20Sopenharmony_ci tZQCL = <360000>; 508c2ecf20Sopenharmony_ci tZQinit = <1000000>; 518c2ecf20Sopenharmony_ci tRAS-max-ns = <70000>; 528c2ecf20Sopenharmony_ci}; 53