Kernel-3.10.0-957.el7_lpddr2-timings

• AC timing parameters of LPDDR2(JESD209-2) memories for a given speed-bin

Required properties:

• compatible : Should be “jedec,lpddr2-timings”
• min-freq : minimum DDR clock frequency for the speed-bin. Type is
• max-freq : maximum DDR clock frequency for the speed-bin. Type is

Optional properties:

The following properties represent AC timing parameters from the memory
data-sheet of the device for a given speed-bin. All these properties are
of type and the default unit is ps (pico seconds). Parameters with
a different unit have a suffix indicating the unit such as ‘tRAS-max-ns’

• tRCD
• tWR
• tRAS-min
• tRRD
• tWTR
• tXP
• tRTP
• tDQSCK-max
• tFAW
• tZQCS
• tZQinit
• tRPab
• tZQCL
• tCKESR
• tRAS-max-ns
• tDQSCK-max-derated

Example:

timings_elpida_ECB240ABACN_400mhz: lpddr2-timings@0 {
compatible = “jedec,lpddr2-timings”;
min-freq = <10000000>;
max-freq = <400000000>;
tRPab = <21000>;
tRCD = <18000>;
tWR = <15000>;
tRAS-min = <42000>;
tRRD = <10000>;
tWTR = <7500>;
tXP = <7500>;
tRTP = <7500>;
tCKESR = <15000>;
tDQSCK-max = <5500>;
tFAW = <50000>;
tZQCS = <90000>;
tZQCL = <360000>;
tZQinit = <1000000>;
tRAS-max-ns = <70000>;
};