usb: dwc3: add Tx de-emphasis quirk
This patch adds Tx de-emphasis quirk, and the Tx de-emphasis value is configurable according to PIPE3 specification. Value Description 0 -6dB de-emphasis 1 -3.5dB de-emphasis 2 No de-emphasis 3 Reserved It can be configured on DT or platform data. Signed-off-by: NHuang Rui <ray.huang@amd.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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