On 01-06-22, 12:26, Krishna Kurapati wrote: > From: Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx> > > Add device tree bindings for SNPS phy tuning parameters. > > Signed-off-by: Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx> > Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx> > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> > --- > .../bindings/phy/qcom,usb-snps-femto-v2.yaml | 96 ++++++++++++++++++++++ > 1 file changed, 96 insertions(+) > > diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml > index 1ce251d..daeeb04 100644 > --- a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml > +++ b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml > @@ -53,6 +53,102 @@ properties: > vdda33-supply: > description: phandle to the regulator 3.3V supply node. > > + qcom,hs-disconnect-bp: > + description: > + This adjusts the voltage level for the threshold used to > + detect a disconnect event at the host. Possible values are. > + The values defined are in multiples of basis points (1bp = 0.01%). > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: -272 > + maximum: 2156 > + > + qcom,squelch-detector-bp: > + description: > + This adjusts the voltage level for the threshold used to > + detect valid high-speed data. > + The values defined are in multiples of basis points (1bp = 0.01%). > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: -2090 > + maximum: 1590 > + > + qcom,hs-amplitude-bp: > + description: > + This adjusts the high-speed DC level voltage. > + The values defined are in multiples of basis points (1bp = 0.01%). > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: -660 > + maximum: 2670 > + > + qcom,pre-emphasis-duration-bp: > + description: > + This signal controls the duration for which the > + HS pre-emphasis current is sourced onto DP<#> or DM<#>. > + The HS Transmitter pre-emphasis duration is defined in terms of > + unit amounts. One unit of pre-emphasis duration is approximately > + 650 ps and is defined as 1X pre-emphasis duration. > + The values defined are in multiples of basis points (1bp = 0.01%). > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: 10000 > + maximum: 20000 > + > + qcom,pre-emphasis-amplitude-bp: > + description: > + This signal controls the amount of current sourced to > + DP<#> and DM<#> after a J-to-K or K-to-J transition. > + The HS Transmitter pre-emphasis current is defined in terms of unit > + amounts. One unit amount is approximately 2 mA and is defined as > + 1X pre-emphasis current. > + The values defined are in multiples of basis points (1bp = 0.01%). > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: 10000 > + maximum: 40000 > + > + qcom,hs-rise-fall-time-bp: > + description: > + This adjusts the rise/fall times of the high-speed waveform. > + The values defined are in multiples of basis points (1bp = 0.01%). > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: -4100 > + maximum: 5430 > + > + qcom,hs-crossover-voltage-microvolt: > + description: > + This adjusts the voltage at which the DP<#> and DM<#> > + signals cross while transmitting in HS mode. > + The values defined are in milli volts. The hardware accepts only > + discrete values. The value closest to the provided input will be > + chosen as the override value for this param. > + minimum: -31000 > + maximum: 28000 > + > + qcom,hs-output-impedance-micro-ohms: > + description: > + In some applications, there can be significant series resistance > + on the D+ and D- paths between the transceiver and cable. This adjusts > + the driver source impedance to compensate for added series > + resistance on the USB. The values defined are in milli ohms. > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: -2300000 > + maximum: 6100000 > + > + qcom,ls-fs-output-impedance-bp: > + description: > + This adjusts the low- and full-speed single-ended source > + impedance while driving high. The following adjustment values are based > + on nominal process, voltage, and temperature. > + The values defined are in multiples of basis points (1bp = 0.01%). > + The hardware accepts only discrete values. The value closest to the > + provided input will be chosen as the override value for this param. > + minimum: -1053 > + maximum: 1310 do we need all these values in DT, till now we have these in driver.. what is the reasoning to add these in DT instead? -- ~Vinod
