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dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings

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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>
Link: https://lore.kernel.org/r/1662480933-12326-2-git-send-email-quic_kriskura@quicinc.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Sandeep Maheswaram 2022-09-06 21:45:31 +05:30 committed by Vinod Koul
parent ac439ce88e
commit ba136ce380
1 changed files with 88 additions and 0 deletions
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88
Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml
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@ -54,6 +54,94 @@ 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.
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 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 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 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 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 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 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 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 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
required:
- compatible
- reg