From a0d245d086c7889b7aee5b9f1c2884cb6e0d3b9b Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Thu, 7 Oct 2021 01:46:51 +0300 Subject: dt-bindings: Relocate DDR bindings Move DDR bindings to memory-controllers directory to make them more discoverable. Suggested-by: Krzysztof Kozlowski Signed-off-by: Dmitry Osipenko Acked-by: Rob Herring Link: https://lore.kernel.org/r/20211006224659.21434-2-digetx@gmail.com [krzysztof: Correct path in lpddr3.txt and samsung,exynos5422-dmc.yaml] Signed-off-by: Krzysztof Kozlowski --- .../bindings/memory-controllers/ddr/lpddr3.txt | 107 +++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 Documentation/devicetree/bindings/memory-controllers/ddr/lpddr3.txt (limited to 'Documentation/devicetree/bindings/memory-controllers/ddr/lpddr3.txt') diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/lpddr3.txt b/Documentation/devicetree/bindings/memory-controllers/ddr/lpddr3.txt new file mode 100644 index 000000000000..031af5fb0379 --- /dev/null +++ b/Documentation/devicetree/bindings/memory-controllers/ddr/lpddr3.txt @@ -0,0 +1,107 @@ +* LPDDR3 SDRAM memories compliant to JEDEC JESD209-3C + +Required properties: +- compatible : Should be ",", and generic value "jedec,lpddr3". + Example "," values: + "samsung,K3QF2F20DB" + +- density : representing density in Mb (Mega bits) +- io-width : representing bus width. Possible values are 8, 16, 32, 64 +- #address-cells: Must be set to 1 +- #size-cells: Must be set to 0 + +Optional properties: + +- manufacturer-id : Manufacturer ID value read from Mode Register 5 +- revision-id : Revision IDs read from Mode Registers 6 and 7 + +The following optional properties represent the minimum value of some AC +timing parameters of the DDR device in terms of number of clock cycles. +These values shall be obtained from the device data-sheet. +- tRFC-min-tck +- tRRD-min-tck +- tRPab-min-tck +- tRPpb-min-tck +- tRCD-min-tck +- tRC-min-tck +- tRAS-min-tck +- tWTR-min-tck +- tWR-min-tck +- tRTP-min-tck +- tW2W-C2C-min-tck +- tR2R-C2C-min-tck +- tWL-min-tck +- tDQSCK-min-tck +- tRL-min-tck +- tFAW-min-tck +- tXSR-min-tck +- tXP-min-tck +- tCKE-min-tck +- tCKESR-min-tck +- tMRD-min-tck + +Child nodes: +- The lpddr3 node may have one or more child nodes of type "lpddr3-timings". + "lpddr3-timings" provides AC timing parameters of the device for + a given speed-bin. Please see + Documentation/devicetree/bindings/memory-controllers/ddr/lpddr3-timings.txt + for more information on "lpddr3-timings" + +Example: + +samsung_K3QF2F20DB: lpddr3 { + compatible = "samsung,K3QF2F20DB", "jedec,lpddr3"; + density = <16384>; + io-width = <32>; + manufacturer-id = <1>; + revision-id = <123 234>; + #address-cells = <1>; + #size-cells = <0>; + + tRFC-min-tck = <17>; + tRRD-min-tck = <2>; + tRPab-min-tck = <2>; + tRPpb-min-tck = <2>; + tRCD-min-tck = <3>; + tRC-min-tck = <6>; + tRAS-min-tck = <5>; + tWTR-min-tck = <2>; + tWR-min-tck = <7>; + tRTP-min-tck = <2>; + tW2W-C2C-min-tck = <0>; + tR2R-C2C-min-tck = <0>; + tWL-min-tck = <8>; + tDQSCK-min-tck = <5>; + tRL-min-tck = <14>; + tFAW-min-tck = <5>; + tXSR-min-tck = <12>; + tXP-min-tck = <2>; + tCKE-min-tck = <2>; + tCKESR-min-tck = <2>; + tMRD-min-tck = <5>; + + timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@800000000 { + compatible = "jedec,lpddr3-timings"; + /* workaround: 'reg' shows max-freq */ + reg = <800000000>; + min-freq = <100000000>; + tRFC = <65000>; + tRRD = <6000>; + tRPab = <12000>; + tRPpb = <12000>; + tRCD = <10000>; + tRC = <33750>; + tRAS = <23000>; + tWTR = <3750>; + tWR = <7500>; + tRTP = <3750>; + tW2W-C2C = <0>; + tR2R-C2C = <0>; + tFAW = <25000>; + tXSR = <70000>; + tXP = <3750>; + tCKE = <3750>; + tCKESR = <3750>; + tMRD = <7000>; + }; +} -- cgit v1.2.3