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Linux/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml

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  1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
  2 %YAML 1.2
  3 ---
  4 $id: http://devicetree.org/schemas/phy/fsl,imx8mq-usb-phy.yaml#
  5 $schema: http://devicetree.org/meta-schemas/core.yaml#
  6 
  7 title: Freescale i.MX8MQ USB3 PHY
  8 
  9 maintainers:
 10   - Li Jun <jun.li@nxp.com>
 11 
 12 properties:
 13   compatible:
 14     enum:
 15       - fsl,imx8mq-usb-phy
 16       - fsl,imx8mp-usb-phy
 17 
 18   reg:
 19     maxItems: 1
 20 
 21   "#phy-cells":
 22     const: 0
 23 
 24   clocks:
 25     maxItems: 1
 26 
 27   clock-names:
 28     items:
 29       - const: phy
 30 
 31   power-domains:
 32     maxItems: 1
 33 
 34   vbus-supply:
 35     description:
 36       A phandle to the regulator for USB VBUS.
 37 
 38   fsl,phy-tx-vref-tune-percent:
 39     description:
 40       Tunes the HS DC level relative to the nominal level
 41     minimum: 94
 42     maximum: 124
 43 
 44   fsl,phy-tx-rise-tune-percent:
 45     description:
 46       Adjusts the rise/fall time duration of the HS waveform relative to
 47       its nominal value
 48     minimum: 97
 49     maximum: 103
 50 
 51   fsl,phy-tx-preemp-amp-tune-microamp:
 52     description:
 53       Adjust amount of current sourced to DPn and DMn after a J-to-K
 54       or K-to-J transition. Default is 0 (disabled).
 55     minimum: 0
 56     maximum: 1800
 57 
 58   fsl,phy-tx-vboost-level-microvolt:
 59     description:
 60       Adjust the boosted transmit launch pk-pk differential amplitude
 61     minimum: 880
 62     maximum: 1120
 63 
 64   fsl,phy-comp-dis-tune-percent:
 65     description:
 66       Adjust the voltage level used to detect a disconnect event at the host
 67       relative to the nominal value
 68     minimum: 91
 69     maximum: 115
 70 
 71   fsl,phy-pcs-tx-deemph-3p5db-attenuation-db:
 72     description:
 73       Adjust TX de-emphasis attenuation in dB at nominal
 74       3.5dB point as per USB specification
 75     $ref: /schemas/types.yaml#/definitions/uint32
 76     minimum: 0
 77     maximum: 36
 78 
 79   fsl,phy-pcs-tx-swing-full-percent:
 80     description:
 81       Scaling of the voltage defined by fsl,phy-tx-vboost-level-microvolt
 82     minimum: 0
 83     maximum: 100
 84 
 85 required:
 86   - compatible
 87   - reg
 88   - "#phy-cells"
 89   - clocks
 90   - clock-names
 91 
 92 additionalProperties: false
 93 
 94 examples:
 95   - |
 96     #include <dt-bindings/clock/imx8mq-clock.h>
 97     usb3_phy0: phy@381f0040 {
 98         compatible = "fsl,imx8mq-usb-phy";
 99         reg = <0x381f0040 0x40>;
100         clocks = <&clk IMX8MQ_CLK_USB1_PHY_ROOT>;
101         clock-names = "phy";
102         #phy-cells = <0>;
103     };

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