| Message ID | 20241107080505.29244-2-quic_sartgarg@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | [V1,1/3] dt-bindings: mmc: qcom: Document level shifter flag for SD card | expand |
diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml index b32253c60919..14f1ec9ae5bd 100644 --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml @@ -131,6 +131,9 @@ properties: $ref: /schemas/types.yaml#/definitions/uint32 description: platform specific settings for DLL_CONFIG reg. + qcom,use-level-shifter: + description: Flag to indicate if platform has level shifter for SD card. + iommus: minItems: 1 maxItems: 8
Introduce a flag to indicate if the Qualcomm platform has a level shifter for SD cards. With level shifter addition some extra delay is seen on RX data path leading to CRC errors. To compensate these delays and avoid CRC errors below things needs to be done: 1) Enable tuning for SDR50 mode 2) Limit HS mode frequency to 37.5MHz from 50MHz Add this flag for all targets with a level shifter to handle these issues for SD card. Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com> --- Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 3 +++ 1 file changed, 3 insertions(+)