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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,stih407-powerdown.yaml
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/snps,dwc3.yaml
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/usb-drd.yaml
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>;
};
};
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