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* Freescale i.MX8MQ USB3 PHY binding
Required properties:
- compatible: Should be "fsl,imx8mq-usb-phy" or "fsl,imx8mp-usb-phy"
- #phys-cells: must be 0 (see phy-bindings.txt in this directory)
- reg: The base address and length of the registers
- clocks: phandles to the clocks for each clock listed in clock-names
- clock-names: must contain "phy"
Optional properties:
- vbus-supply: A phandle to the regulator for USB VBUS.
- vbus-power-supply: A phandle to the vbus power supply provider, used to
to detect the possible BC charger type of it.
- fsl,phy-tx-vref-tune: Adjusts the high-speed DC level voltage.
- 1111: + 24%
- 1110: + 22%
.....
- 0101: + 4%
- 0100: + 2%
- 0011: 0 (default on imx8mp)
- 0010: – 2%
- 0001: – 4%
- 0000: – 6%
- fsl,phy-tx-rise-tune: Adjusts the rise/fall times of the high-speed waveform.
- 11: – 3%
- 10: – 1%
- 01: 0 (default on imx8mp)
- 00: + 3%
- fsl,phy-tx-preemp-amp-tune: This property controls the amount of current
source 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 600 μA and is defined as 1X
pre-emphasis current.
- 11: 3x pre-emphasis current
- 10: 2x pre-emphasis current
- 01: 1x pre-emphasis current
- 00: Disabled (default on imx8mp)
- fsl,phy-comp-dis-tune: Adjusts the voltage level for the threshold used to
detect a disconnect event at the host.
- 111: + 15.54%
- 110: + 11.86%
- 101: + 7.52%
- 100: + 4.08%
- 011: 0 (default on imx8mp)
- 010: – 3.04%
- 001: – 6.5%
- 000: – 9.01%
- fsl,pcs-tx-deemph-3p5db: This property sets the TX driver de-emphasis value
when pipeP_tx_deemph[1:0] is set to 2’b01 (according
to the PIPE3 specification), default value is 23 on
imx8mp.
- fsl,phy-pcs-tx-swing-full: This property sets the launch amplitude of the
transmitter, default value is 120 (7b'1111000)
on imx8mp.
Example:
usb3_phy0: phy@381f0040 {
compatible = "fsl,imx8mq-usb-phy";
reg = <0x381f0040 0x40>;
clocks = <&clk IMX8MQ_CLK_USB1_PHY_ROOT>;
clock-names = "phy";
#phy-cells = <0>;
};
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