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MLK-23319-2 doc: dts: ci-hdrc-usb2: add property for imx picophy

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Add two parameters which are used to tune USB signal for imx picophy,
picophy is used at imx7d and imx8mm.

Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
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Peter Chen 2018-08-21 17:15:36 +08:00
parent 613c257750
commit 91cd1c34b4
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Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
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@ -97,6 +97,13 @@ i.mx specific properties
It's recommended to specify the over current polarity.
- power-active-high: power signal polarity is active high
- external-vbus-divider: enables off-chip resistor divider for Vbus
- picophy,pre-emp-curr-control: HS Transmitter Pre-Emphasis Current
Control. This signal controls the amount of current sourced to the
USB_OTG*_DP and USB_OTG*_DN pins after a J-to-K or K-to-J transition.
Details can refer to TXPREEMPAMPTUNE0 bits of USBNC_n_PHY_CFG1.
- picophy,dc-vol-level-adjust: HS DC Voltage Level Adjustment.
Adjust the high-speed transmitter DC level voltage, details can refer
to TXVREFTUNE0 bits of USBNC_n_PHY_CFG1.
Example: