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106 lines
2.6 KiB
106 lines
2.6 KiB
* LPDDR3 SDRAM memories compliant to JEDEC JESD209-3C |
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Required properties: |
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- compatible : Should be "<vendor>,<type>", and generic value "jedec,lpddr3". |
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Example "<vendor>,<type>" values: |
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"samsung,K3QF2F20DB" |
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- density : <u32> representing density in Mb (Mega bits) |
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- io-width : <u32> representing bus width. Possible values are 8, 16, 32, 64 |
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- #address-cells: Must be set to 1 |
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- #size-cells: Must be set to 0 |
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Optional properties: |
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- manufacturer-id : <u32> Manufacturer ID value read from Mode Register 5 |
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- revision-id : <u32 u32> Revision IDs read from Mode Registers 6 and 7 |
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The following optional properties represent the minimum value of some AC |
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timing parameters of the DDR device in terms of number of clock cycles. |
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These values shall be obtained from the device data-sheet. |
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- tRFC-min-tck |
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- tRRD-min-tck |
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- tRPab-min-tck |
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- tRPpb-min-tck |
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- tRCD-min-tck |
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- tRC-min-tck |
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- tRAS-min-tck |
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- tWTR-min-tck |
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- tWR-min-tck |
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- tRTP-min-tck |
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- tW2W-C2C-min-tck |
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- tR2R-C2C-min-tck |
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- tWL-min-tck |
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- tDQSCK-min-tck |
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- tRL-min-tck |
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- tFAW-min-tck |
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- tXSR-min-tck |
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- tXP-min-tck |
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- tCKE-min-tck |
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- tCKESR-min-tck |
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- tMRD-min-tck |
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Child nodes: |
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- The lpddr3 node may have one or more child nodes of type "lpddr3-timings". |
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"lpddr3-timings" provides AC timing parameters of the device for |
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a given speed-bin. Please see Documentation/devicetree/ |
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bindings/ddr/lpddr3-timings.txt for more information on "lpddr3-timings" |
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Example: |
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samsung_K3QF2F20DB: lpddr3 { |
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compatible = "samsung,K3QF2F20DB", "jedec,lpddr3"; |
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density = <16384>; |
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io-width = <32>; |
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manufacturer-id = <1>; |
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revision-id = <123 234>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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tRFC-min-tck = <17>; |
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tRRD-min-tck = <2>; |
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tRPab-min-tck = <2>; |
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tRPpb-min-tck = <2>; |
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tRCD-min-tck = <3>; |
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tRC-min-tck = <6>; |
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tRAS-min-tck = <5>; |
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tWTR-min-tck = <2>; |
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tWR-min-tck = <7>; |
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tRTP-min-tck = <2>; |
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tW2W-C2C-min-tck = <0>; |
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tR2R-C2C-min-tck = <0>; |
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tWL-min-tck = <8>; |
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tDQSCK-min-tck = <5>; |
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tRL-min-tck = <14>; |
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tFAW-min-tck = <5>; |
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tXSR-min-tck = <12>; |
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tXP-min-tck = <2>; |
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tCKE-min-tck = <2>; |
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tCKESR-min-tck = <2>; |
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tMRD-min-tck = <5>; |
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timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 { |
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compatible = "jedec,lpddr3-timings"; |
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/* workaround: 'reg' shows max-freq */ |
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reg = <800000000>; |
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min-freq = <100000000>; |
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tRFC = <65000>; |
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tRRD = <6000>; |
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tRPab = <12000>; |
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tRPpb = <12000>; |
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tRCD = <10000>; |
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tRC = <33750>; |
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tRAS = <23000>; |
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tWTR = <3750>; |
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tWR = <7500>; |
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tRTP = <3750>; |
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tW2W-C2C = <0>; |
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tR2R-C2C = <0>; |
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tFAW = <25000>; |
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tXSR = <70000>; |
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tXP = <3750>; |
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tCKE = <3750>; |
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tCKESR = <3750>; |
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tMRD = <7000>; |
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}; |
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}
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