Data transfer mode is fixed by TrustZone (TZ), which currently restricts developers from modifying the transfer mode from the APPS side. Document the 'qcom,xfer-mode' properties to select the data transfer mode, either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). I2C controller can operate in one of two modes based on the 'qcom,xfer-mode' property, and the firmware is loaded accordingly. Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@xxxxxxxxxxx> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@xxxxxxxxxxx> Signed-off-by: Viken Dadhaniya <quic_vdadhani@xxxxxxxxxxx> --- v1 -> v2: - Drop 'qcom,load-firmware' property and add 'firmware-name' property in qup common driver. - Update commit log. v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-2-quic_vdadhani@xxxxxxxxxxx/ --- --- .../devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml index 9f66a3bb1f80..68e4bf0c84d1 100644 --- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml @@ -66,6 +66,12 @@ properties: required-opps: maxItems: 1 + qcom,xfer-mode: + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. + The default mode is FIFO. + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [1, 3] + required: - compatible - interrupts @@ -142,5 +148,6 @@ examples: interconnect-names = "qup-core", "qup-config", "qup-memory"; power-domains = <&rpmhpd SC7180_CX>; required-opps = <&rpmhpd_opp_low_svs>; + qcom,xfer-mode = <1>; }; ... -- 2.34.1
