| # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr-props.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Common properties for LPDDR types |
| |
| description: |
| Different LPDDR types generally use the same properties and only differ in the |
| range of legal values for each. This file defines the common parts that can be |
| reused for each type. Nodes using this schema should generally be nested under |
| an LPDDR channel node. |
| |
| maintainers: |
| - Krzysztof Kozlowski <krzk@kernel.org> |
| |
| properties: |
| compatible: |
| description: |
| Compatible strings can be either explicit vendor names and part numbers |
| (e.g. elpida,ECB240ABACN), or generated strings of the form |
| lpddrX-YY,ZZZZ where X is the LPDDR version, YY is the manufacturer ID |
| (from MR5) and ZZZZ is the revision ID (from MR6 and MR7). Both IDs are |
| formatted in lower case hexadecimal representation with leading zeroes. |
| The latter form can be useful when LPDDR nodes are created at runtime by |
| boot firmware that doesn't have access to static part number information. |
| |
| reg: |
| description: |
| The rank number of this LPDDR rank when used as a subnode to an LPDDR |
| channel. |
| minimum: 0 |
| maximum: 3 |
| |
| revision-id: |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| description: |
| Revision IDs read from Mode Register 6 and 7. One byte per uint32 cell (i.e. <MR6 MR7>). |
| maxItems: 2 |
| items: |
| minimum: 0 |
| maximum: 255 |
| |
| density: |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| description: |
| Density in megabits of SDRAM chip. Decoded from Mode Register 8. |
| enum: |
| - 64 |
| - 128 |
| - 256 |
| - 512 |
| - 1024 |
| - 2048 |
| - 3072 |
| - 4096 |
| - 6144 |
| - 8192 |
| - 12288 |
| - 16384 |
| - 24576 |
| - 32768 |
| |
| io-width: |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| description: |
| IO bus width in bits of SDRAM chip. Decoded from Mode Register 8. |
| enum: |
| - 8 |
| - 16 |
| - 32 |
| |
| additionalProperties: true |