Kernel-4.18.0-80.el8_qcom-qusb2-phy

Qualcomm QUSB2 phy controller

QUSB2 controller supports LS/FS/HS usb connectivity on Qualcomm chipsets.

Required properties:

• compatible: compatible list, contains

      "qcom,msm8996-qusb2-phy" for 14nm PHY on msm8996,
      "qcom,sdm845-qusb2-phy" for 10nm PHY on sdm845.
  

• reg: offset and length of the PHY register set.

• #phy-cells: must be 0.

• clocks: a list of phandles and clock-specifier pairs,

  one for each entry in clock-names.
  

• clock-names: must be “cfg_ahb” for phy config clock,

       "ref" for 19.2 MHz ref clk,
       "iface" for phy interface clock (Optional).
  

• vdda-pll-supply: Phandle to 1.8V regulator supply to PHY refclk pll block.

• vdda-phy-dpdm-supply: Phandle to 3.1V regulator supply to Dp/Dm port signals.

• resets: Phandle to reset to phy block.

Optional properties:

• nvmem-cells: Phandle to nvmem cell that contains ‘HS Tx trim’

   tuning parameter value for qusb2 phy.
  

• qcom,tcsr-syscon: Phandle to TCSR syscon register region.

• qcom,imp-res-offset-value: It is a 6 bit value that specifies offset to be

   added to PHY refgen RESCODE via IMP_CTRL1 register. It is a PHY
   tuning parameter that may vary for different boards of same SOC.
   This property is applicable to only QUSB2 v2 PHY (sdm845).
  

• qcom,hstx-trim-value: It is a 4 bit value that specifies tuning for HSTX

   output current.
   Possible range is - 15mA to 24mA (stepsize of 600 uA).
   See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
   This property is applicable to only QUSB2 v2 PHY (sdm845).
   Default value is 22.2mA for sdm845.
  

• qcom,preemphasis-level: It is a 2 bit value that specifies pre-emphasis level.

   Possible range is 0 to 15% (stepsize of 5%).
   See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
   This property is applicable to only QUSB2 v2 PHY (sdm845).
   Default value is 10% for sdm845.
  

• qcom,preemphasis-width: It is a 1 bit value that specifies how long the HSTX

    pre-emphasis (specified using qcom,preemphasis-level) must be in
    effect. Duration could be half-bit of full-bit.
    See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
    This property is applicable to only QUSB2 v2 PHY (sdm845).
    Default value is full-bit width for sdm845.
  

Example:
hsusb_phy: phy@7411000 {
compatible = “qcom,msm8996-qusb2-phy”;
reg = <0x7411000 0x180>;
#phy-cells = <0>;

    clocks = <&gcc GCC_USB_PHY_CFG_AHB2PHY_CLK>,
        <&gcc GCC_RX1_USB2_CLKREF_CLK>,
    clock-names = "cfg_ahb", "ref";

    vdda-pll-supply = <&pm8994_l12>;
    vdda-phy-dpdm-supply = <&pm8994_l24>;

    resets = <&gcc GCC_QUSB2PHY_PRIM_BCR>;
    nvmem-cells = <&qusb2p_hstx_trim>;
    };