Introduce as per jedec,lpddrX-channel binding, jdec,ddr[3-4]-channel binding. Signed-off-by: Clément Le Goffic <clement.legoffic@xxxxxxxxxxx> --- .../memory-controllers/ddr/jedec,ddr-channel.yaml | 53 ++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr-channel.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr-channel.yaml new file mode 100644 index 000000000000..31daa22bcd4a --- /dev/null +++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr-channel.yaml @@ -0,0 +1,53 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,ddr-channel.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: DDR channel with chip/rank topology description + +description: + A DDR channel is a logical grouping of memory chips that are connected + to a host system. The main purpose of this node is to describe the + overall DDR topology of the system, including the amount of individual + DDR chips. + +maintainers: + - Clément Le Goffic <legoffic.clement@xxxxxxxxx> + +properties: + compatible: + enum: + - jedec,ddr3-channel + - jedec,ddr4-channel + + io-width: + description: + The number of DQ pins in the channel. If this number is different + from (a multiple of) the io-width of the DDR chip, that means that + multiple instances of that type of chip are wired in parallel on this + channel (with the channel's DQ pins split up between the different + chips, and the CA, CS, etc. pins of the different chips all shorted + together). This means that the total physical memory controlled by a + channel is equal to the sum of the densities of each rank on the + connected DDR chip, times the io-width of the channel divided by + the io-width of the DDR chip. + enum: + - 8 + - 16 + - 32 + - 64 + - 128 + +required: + - compatible + - io-width + +additionalProperties: false + +examples: + - | + ddr_channel: ddr3-channel { + compatible = "jedec,ddr3-channel"; + io-width = <16>; + }; -- 2.43.0
