Kernel-4.18.0-80.el8_dwc3-st

ST DWC3 glue logic

This file documents the parameters for the dwc3-st driver.
This driver controls the glue logic used to configure the dwc3 core on
STiH407 based platforms.

Required properties:

• compatible : must be “st,stih407-dwc3”

• reg : glue logic base address and USB syscfg ctrl register offset

• reg-names : should be “reg-glue” and “syscfg-reg”

• st,syscon : should be phandle to system configuration node which

     encompasses the glue registers
  

• resets : list of phandle and reset specifier pairs. There should be two entries, one

     for the powerdown and softreset lines of the usb3 IP
  

• reset-names : list of reset signal names. Names should be “powerdown” and “softreset”
  See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
  See: Documentation/devicetree/bindings/reset/reset.txt

• #address-cells, #size-cells : should be ‘1’ if the device has sub-nodes
  with ‘reg’ property

• pinctl-names : A pinctrl state named “default” must be defined
  See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

• pinctrl-0 : Pin control group
  See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

• ranges : allows valid 1:1 translation between child’s address space and

     parent's address space
  

Sub-nodes:
The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
example below. The DT binding details of dwc3 can be found in:
Documentation/devicetree/bindings/usb/dwc3.txt

NB: The dr_mode property described in [1] is NOT optional for this driver, as the default value
is “otg”, which isn’t supported by this SoC. Valid dr_mode values for dwc3-st are either “host”
or “device”.

[1] Documentation/devicetree/bindings/usb/generic.txt

Example:

st_dwc3: dwc3@8f94000 {
compatible = “st,stih407-dwc3”;
reg = <0x08f94000 0x1000>, <0x110 0x4>;
reg-names = “reg-glue”, “syscfg-reg”;
st,syscfg = <&syscfg_core>;
resets = <&powerdown STIH407_USB3_POWERDOWN>,
<&softreset STIH407_MIPHY2_SOFTRESET>;
reset-names = “powerdown”, “softreset”;
#address-cells = <1>;
#size-cells = <1>;
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_usb3>;
ranges;

dwc3: dwc3@9900000 {
    compatible    = "snps,dwc3";
    reg        = <0x09900000 0x100000>;
    interrupts    = <GIC_SPI 155 IRQ_TYPE_NONE>;
    dr_mode        = "host";
    phy-names    = "usb2-phy", "usb3-phy";
    phys        = <&usb2_picophy2>, <&phy_port2 PHY_TYPE_USB3>;
};

};