18c2ecf20Sopenharmony_ci* AC timing parameters of LPDDR3 memories for a given speed-bin. 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ciThe structures are based on LPDDR2 and extended where needed. 48c2ecf20Sopenharmony_ci 58c2ecf20Sopenharmony_ciRequired properties: 68c2ecf20Sopenharmony_ci- compatible : Should be "jedec,lpddr3-timings" 78c2ecf20Sopenharmony_ci- min-freq : minimum DDR clock frequency for the speed-bin. Type is <u32> 88c2ecf20Sopenharmony_ci- reg : maximum DDR clock frequency for the speed-bin. Type is <u32> 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciOptional properties: 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ciThe following properties represent AC timing parameters from the memory 138c2ecf20Sopenharmony_cidata-sheet of the device for a given speed-bin. All these properties are 148c2ecf20Sopenharmony_ciof type <u32> and the default unit is ps (pico seconds). 158c2ecf20Sopenharmony_ci- tRFC 168c2ecf20Sopenharmony_ci- tRRD 178c2ecf20Sopenharmony_ci- tRPab 188c2ecf20Sopenharmony_ci- tRPpb 198c2ecf20Sopenharmony_ci- tRCD 208c2ecf20Sopenharmony_ci- tRC 218c2ecf20Sopenharmony_ci- tRAS 228c2ecf20Sopenharmony_ci- tWTR 238c2ecf20Sopenharmony_ci- tWR 248c2ecf20Sopenharmony_ci- tRTP 258c2ecf20Sopenharmony_ci- tW2W-C2C 268c2ecf20Sopenharmony_ci- tR2R-C2C 278c2ecf20Sopenharmony_ci- tFAW 288c2ecf20Sopenharmony_ci- tXSR 298c2ecf20Sopenharmony_ci- tXP 308c2ecf20Sopenharmony_ci- tCKE 318c2ecf20Sopenharmony_ci- tCKESR 328c2ecf20Sopenharmony_ci- tMRD 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ciExample: 358c2ecf20Sopenharmony_ci 368c2ecf20Sopenharmony_citimings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 { 378c2ecf20Sopenharmony_ci compatible = "jedec,lpddr3-timings"; 388c2ecf20Sopenharmony_ci reg = <800000000>; /* workaround: it shows max-freq */ 398c2ecf20Sopenharmony_ci min-freq = <100000000>; 408c2ecf20Sopenharmony_ci tRFC = <65000>; 418c2ecf20Sopenharmony_ci tRRD = <6000>; 428c2ecf20Sopenharmony_ci tRPab = <12000>; 438c2ecf20Sopenharmony_ci tRPpb = <12000>; 448c2ecf20Sopenharmony_ci tRCD = <10000>; 458c2ecf20Sopenharmony_ci tRC = <33750>; 468c2ecf20Sopenharmony_ci tRAS = <23000>; 478c2ecf20Sopenharmony_ci tWTR = <3750>; 488c2ecf20Sopenharmony_ci tWR = <7500>; 498c2ecf20Sopenharmony_ci tRTP = <3750>; 508c2ecf20Sopenharmony_ci tW2W-C2C = <0>; 518c2ecf20Sopenharmony_ci tR2R-C2C = <0>; 528c2ecf20Sopenharmony_ci tFAW = <25000>; 538c2ecf20Sopenharmony_ci tXSR = <70000>; 548c2ecf20Sopenharmony_ci tXP = <3750>; 558c2ecf20Sopenharmony_ci tCKE = <3750>; 568c2ecf20Sopenharmony_ci tCKESR = <3750>; 578c2ecf20Sopenharmony_ci tMRD = <7000>; 588c2ecf20Sopenharmony_ci}; 59