Messages in this thread | | | Date | Wed, 8 Jun 2022 16:33:04 +0530 | Subject | Re: [PATCH v8 1/3] dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings | From | Krishna Kurapati PSSNV <> |
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On 6/8/2022 3:06 PM, Krzysztof Kozlowski wrote: > On 01/06/2022 08:56, Krishna Kurapati wrote: >> From: Sandeep Maheswaram <quic_c_sanm@quicinc.com> >> >> Add device tree bindings for SNPS phy tuning parameters. >> >> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> >> Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> >> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> >> --- >> .../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. > It's not accurate anymore - it's microvolt. I propose to skip this one > sentence, because unit is obvious from the type. > >> + 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 same. Other places might need similar change. > > Best regards, > Krzysztof
Hi Krzysztof,
Sure, will modify the description for all the params.
Regards,
Krishna,
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