1* LPDDR2 SDRAM memories compliant to JEDEC JESD209-2
  2
  3Required properties:
  4- compatible : Should be one of - "jedec,lpddr2-nvm", "jedec,lpddr2-s2",
  5  "jedec,lpddr2-s4"
  6
  7  "ti,jedec-lpddr2-s2" should be listed if the memory part is LPDDR2-S2 type
  8
  9  "ti,jedec-lpddr2-s4" should be listed if the memory part is LPDDR2-S4 type
 10
 11  "ti,jedec-lpddr2-nvm" should be listed if the memory part is LPDDR2-NVM type
 12
 13- density  : <u32> representing density in Mb (Mega bits)
 14
 15- io-width : <u32> representing bus width. Possible values are 8, 16, and 32
 16
 17Optional properties:
 18
 19The following optional properties represent the minimum value of some AC
 20timing parameters of the DDR device in terms of number of clock cycles.
 21These values shall be obtained from the device data-sheet.
 22- tRRD-min-tck
 23- tWTR-min-tck
 24- tXP-min-tck
 25- tRTP-min-tck
 26- tCKE-min-tck
 27- tRPab-min-tck
 28- tRCD-min-tck
 29- tWR-min-tck
 30- tRASmin-min-tck
 31- tCKESR-min-tck
 32- tFAW-min-tck
 33
 34Child nodes:
 35- The lpddr2 node may have one or more child nodes of type "lpddr2-timings".
 36  "lpddr2-timings" provides AC timing parameters of the device for
 37  a given speed-bin. The user may provide the timings for as many
 38  speed-bins as is required. Please see Documentation/devicetree/
 39  bindings/lpddr2/lpddr2-timings.txt for more information on "lpddr2-timings"
 40
 41Example:
 42
 43elpida_ECB240ABACN : lpddr2 {
 44	compatible	= "Elpida,ECB240ABACN","jedec,lpddr2-s4";
 45	density		= <2048>;
 46	io-width	= <32>;
 47
 48	tRPab-min-tck	= <3>;
 49	tRCD-min-tck	= <3>;
 50	tWR-min-tck	= <3>;
 51	tRASmin-min-tck	= <3>;
 52	tRRD-min-tck	= <2>;
 53	tWTR-min-tck	= <2>;
 54	tXP-min-tck	= <2>;
 55	tRTP-min-tck	= <2>;
 56	tCKE-min-tck	= <3>;
 57	tCKESR-min-tck	= <3>;
 58	tFAW-min-tck	= <8>;
 59
 60	timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 {
 61		compatible	= "jedec,lpddr2-timings";
 62		min-freq	= <10000000>;
 63		max-freq	= <400000000>;
 64		tRPab		= <21000>;
 65		tRCD		= <18000>;
 66		tWR		= <15000>;
 67		tRAS-min	= <42000>;
 68		tRRD		= <10000>;
 69		tWTR		= <7500>;
 70		tXP		= <7500>;
 71		tRTP		= <7500>;
 72		tCKESR		= <15000>;
 73		tDQSCK-max	= <5500>;
 74		tFAW		= <50000>;
 75		tZQCS		= <90000>;
 76		tZQCL		= <360000>;
 77		tZQinit		= <1000000>;
 78		tRAS-max-ns	= <70000>;
 79	};
 80
 81	timings_elpida_ECB240ABACN_200mhz: lpddr2-timings@1 {
 82		compatible	= "jedec,lpddr2-timings";
 83		min-freq	= <10000000>;
 84		max-freq	= <200000000>;
 85		tRPab		= <21000>;
 86		tRCD		= <18000>;
 87		tWR		= <15000>;
 88		tRAS-min	= <42000>;
 89		tRRD		= <10000>;
 90		tWTR		= <10000>;
 91		tXP		= <7500>;
 92		tRTP		= <7500>;
 93		tCKESR		= <15000>;
 94		tDQSCK-max	= <5500>;
 95		tFAW		= <50000>;
 96		tZQCS		= <90000>;
 97		tZQCL		= <360000>;
 98		tZQinit		= <1000000>;
 99		tRAS-max-ns	= <70000>;
100	};
101
102}