xref: /linux/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-props.yaml (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr-props.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Common properties for LPDDR types
8
9description:
10  Different LPDDR types generally use the same properties and only differ in the
11  range of legal values for each. This file defines the common parts that can be
12  reused for each type. Nodes using this schema should generally be nested under
13  an LPDDR channel node.
14
15maintainers:
16  - Krzysztof Kozlowski <krzk@kernel.org>
17
18properties:
19  compatible:
20    description:
21      Compatible strings can be either explicit vendor names and part numbers
22      (e.g. elpida,ECB240ABACN), or generated strings of the form
23      lpddrX-YY,ZZZZ where X is the LPDDR version, YY is the manufacturer ID
24      (from MR5) and ZZZZ is the revision ID (from MR6 and MR7). Both IDs are
25      formatted in lower case hexadecimal representation with leading zeroes.
26      The latter form can be useful when LPDDR nodes are created at runtime by
27      boot firmware that doesn't have access to static part number information.
28
29  reg:
30    description:
31      The rank number of this LPDDR rank when used as a subnode to an LPDDR
32      channel.
33    minimum: 0
34    maximum: 3
35
36  revision-id:
37    $ref: /schemas/types.yaml#/definitions/uint32-array
38    description:
39      Revision IDs read from Mode Register 6 and 7. One byte per uint32 cell (i.e. <MR6 MR7>).
40    maxItems: 2
41    items:
42      minimum: 0
43      maximum: 255
44
45  density:
46    $ref: /schemas/types.yaml#/definitions/uint32
47    description:
48      Density in megabits of SDRAM chip. Decoded from Mode Register 8.
49    enum:
50      - 64
51      - 128
52      - 256
53      - 512
54      - 1024
55      - 2048
56      - 3072
57      - 4096
58      - 6144
59      - 8192
60      - 12288
61      - 16384
62      - 24576
63      - 32768
64
65  io-width:
66    $ref: /schemas/types.yaml#/definitions/uint32
67    description:
68      IO bus width in bits of SDRAM chip. Decoded from Mode Register 8.
69    enum:
70      - 8
71      - 16
72      - 32
73
74additionalProperties: true
75