memory-controllers/ddr/jedec%2Clpddr-channel.yaml

1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr-channel.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: LPDDR channel with chip/rank topology description
10   An LPDDR channel is a completely independent set of LPDDR pins (DQ, CA, CS,
16   - Julius Werner <jwerner@chromium.org>
21       - jedec,lpddr2-channel
22       - jedec,lpddr3-channel
23       - jedec,lpddr4-channel
24       - jedec,lpddr5-channel
26   io-width:
28       The number of DQ pins in the channel. If this number is different
29       from (a multiple of) the io-width of the LPDDR chip, that means that
31       channel (with the channel's DQ pins split up between the different
34       channel is equal to the sum of the densities of each rank on the
35       connected LPDDR chip, times the io-width of the channel divided by
36       the io-width of the LPDDR chip.
38       - 8
39       - 16
40       - 32
41       - 64
42       - 128
44   "#address-cells":
47   "#size-cells":
51   "^rank@[0-9]+$":
55       internal but fully independent sub-units of the chip. Each LPDDR bus
56       transaction on the channel targets exactly one rank, based on the
60       - reg
63   - if:
67             const: jedec,lpddr2-channel
70         "^rank@[0-9]+$":
71           $ref: /schemas/memory-controllers/ddr/jedec,lpddr2.yaml#
72   - if:
76             const: jedec,lpddr3-channel
79         "^rank@[0-9]+$":
80           $ref: /schemas/memory-controllers/ddr/jedec,lpddr3.yaml#
81   - if:
85             const: jedec,lpddr4-channel
88         "^rank@[0-9]+$":
89           $ref: /schemas/memory-controllers/ddr/jedec,lpddr4.yaml#
90   - if:
94             const: jedec,lpddr5-channel
97         "^rank@[0-9]+$":
98           $ref: /schemas/memory-controllers/ddr/jedec,lpddr5.yaml#
101   - compatible
102   - io-width
103   - "#address-cells"
104   - "#size-cells"
109   - |
110     lpddr-channel0 {
111       #address-cells = <1>;
112       #size-cells = <0>;
113       compatible = "jedec,lpddr3-channel";
114       io-width = <32>;
117         compatible = "lpddr3-ff,0100", "jedec,lpddr3";
120         io-width = <16>;
121         revision-id = <1 0>;
125     lpddr-channel1 {
126       #address-cells = <1>;
127       #size-cells = <0>;
128       compatible = "jedec,lpddr4-channel";
129       io-width = <32>;
132         compatible = "lpddr4-05,0301", "jedec,lpddr4";
135         io-width = <32>;
136         revision-id = <3 1>;
140         compatible = "lpddr4-05,0301", "jedec,lpddr4";
143         io-width = <32>;
144         revision-id = <3 1>;