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 7 title: Common properties for LPDDR types 8 9 description: 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 15 maintainers: 16 - Krzysztof Kozlowski <krzk@kernel.org> 17 18 properties: 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 74 additionalProperties: true
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