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scsi: ufs: dt-bindings: Document gear and rate limit properties

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Add optional "limit-hs-gear" and "limit-rate" properties to the UFS
controller common binding. These properties allow limiting the maximum
HS gear and rate.

This is useful in cases where the customer board may have signal
integrity, clock configuration or layout issues that prevent reliable
operation at higher gears. Such limitations are especially critical in
those platforms, where stability is prioritized over peak performance.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@quicinc.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ram Kumar Dwivedi 2025-09-17 19:39:30 +05:30 committed by Martin K. Petersen
parent 8f5ae30d69
commit 91945660ac
1 changed files with 16 additions and 0 deletions
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16
Documentation/devicetree/bindings/ufs/ufs-common.yaml
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@ -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 ]