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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2025-09-24 22:28:45 -0400 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2025-09-24 22:28:45 -0400 |
| commit | 3bd70aec2614a1a7ed2dfe83af63a10ebb8229ed (patch) | |
| tree | 21dd5b4402781ed546acdeca9e5cc343a35ed1a7 /Documentation | |
| parent | 79dde5f7dc7c038eec903745dc1550cd4139980e (diff) | |
| parent | 88f4d3aa29c8b1944ad506ac92c948258cbc004b (diff) | |
Merge patch series "Add DT-based gear and rate limiting support"
Ram Kumar Dwivedi <quic_rdwivedi@quicinc.com> says:
This patch series adds support for limiting the maximum high-speed
gear and rate used by the UFS controller via device tree properties.
Some platforms may have signal integrity, clock configuration, or
layout issues that prevent reliable operation at higher gears or
rates. This is especially critical in automotive and other platforms
where stability is prioritized over peak performance.
The series follows this logical progression:
1. Document the new DT properties in the common UFS binding
2. Clean up existing redundant code in the qcom driver
3. Add platform-level parsing support for the new properties
4. Integrate the platform support in the qcom driver
This approach makes the functionality available to other UFS host
drivers and provides a cleaner, more maintainable implementation.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/ufs/ufs-common.yaml | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/ufs/ufs-common.yaml b/Documentation/devicetree/bindings/ufs/ufs-common.yaml index 31fe7f30ff5b..9f04f34d8c5a 100644 --- a/Documentation/devicetree/bindings/ufs/ufs-common.yaml +++ b/Documentation/devicetree/bindings/ufs/ufs-common.yaml @@ -89,6 +89,22 @@ properties: msi-parent: true + limit-hs-gear: + $ref: /schemas/types.yaml#/definitions/uint32 + minimum: 1 + maximum: 6 + default: 6 + description: + Restricts the maximum HS gear used in both TX and RX directions. + + limit-gear-rate: + $ref: /schemas/types.yaml#/definitions/string + enum: [rate-a, rate-b] + default: rate-b + description: + Restricts the UFS controller to rate-a or rate-b for both TX and + RX directions. + dependencies: freq-table-hz: [ clocks ] operating-points-v2: [ clocks, clock-names ] |