Commit 91945660 authored by Ram Kumar Dwivedi's avatar Ram Kumar Dwivedi Committed by Martin K. Petersen
Browse files

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



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: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: default avatarRam Kumar Dwivedi <quic_rdwivedi@quicinc.com>
Reviewed-by: default avatarAlim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 8f5ae30d

Documentation/devicetree/bindings/ufs/ufs-common.yaml

+16 −0
Original line number Diff line number Diff line
@@ -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 ]