On Mon, Oct 7, 2024 at 8:26 PM Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote: > > On 07/10/2024 15:55, Joy Chakraborty wrote: > > PIPE4 spec defines an 18bit de-emphasis setting to be passed from > > controller to the PHY. > > TxDeemph[17:0] is split as [5:0] C-1, [11:6] C0, [17:12] C+1 for 3 tap > > filter used for USB Gen2(10GT/s). > > > > Signed-off-by: Joy Chakraborty <joychakr@xxxxxxxxxx> > > --- > > Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml > > index 1cd0ca90127d..a1f1bbcf1467 100644 > > --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml > > +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml > > @@ -190,6 +190,18 @@ properties: > > - 1 # -3.5dB de-emphasis > > - 2 # No de-emphasis > > > > + snps,tx_gen2_de_emphasis_quirk: > > No underscores. Ack, will fix it with a follow up patch. > > > + description: When set core will set Tx de-emphasis for USB Gen2 > > And why it cannot be implied by compatible? As per my understanding these are tuning coefficients for de-emphasis particular to a platform and not the dwc3 controller, hence should not be a controller compatible. Similar to the property defined right above this definition which is from PIPE3 spec for USB Gen1. Thanks Joy > > > + type: boolean > > + > Best regards, > Krzysztof >
