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dt-bindings: phy: qcom,snps-eusb2-repeater: Add magic tuning overrides

The EUSB2 repeater requires some alterations to its init sequence,
depending on board design.

Add support for making the necessary changes to that sequence to make USB
functional on SM8550-based Xperia 1 V.

They all have lackluster description due to lack of information.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230830-topic-eusb2_override-v2-1-7d8c893d93f6@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

authored by

Konrad Dybcio and committed by
Vinod Koul c20b59b2 77fee21e

+21
+21
Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
··· 32 32 33 33 vdd3-supply: true 34 34 35 + qcom,tune-usb2-disc-thres: 36 + $ref: /schemas/types.yaml#/definitions/uint8 37 + description: High-Speed disconnect threshold 38 + minimum: 0 39 + maximum: 7 40 + default: 0 41 + 42 + qcom,tune-usb2-amplitude: 43 + $ref: /schemas/types.yaml#/definitions/uint8 44 + description: High-Speed trasmit amplitude 45 + minimum: 0 46 + maximum: 15 47 + default: 8 48 + 49 + qcom,tune-usb2-preem: 50 + $ref: /schemas/types.yaml#/definitions/uint8 51 + description: High-Speed TX pre-emphasis tuning 52 + minimum: 0 53 + maximum: 7 54 + default: 5 55 + 35 56 required: 36 57 - compatible 37 58 - reg