1ST DWC3 glue logic
2
3This file documents the parameters for the dwc3-st driver.
4This driver controls the glue logic used to configure the dwc3 core on
5STiH407 based platforms.
6
7Required properties:
8 - compatible	: must be "st,stih407-dwc3"
9 - reg		: glue logic base address and USB syscfg ctrl register offset
10 - reg-names	: should be "reg-glue" and "syscfg-reg"
11 - st,syscon	: should be phandle to system configuration node which
12		  encompasses the glue registers
13 - resets	: list of phandle and reset specifier pairs. There should be two entries, one
14		  for the powerdown and softreset lines of the usb3 IP
15 - reset-names	: list of reset signal names. Names should be "powerdown" and "softreset"
16See: Documentation/devicetree/bindings/reset/st,stih407-powerdown.yaml
17See: Documentation/devicetree/bindings/reset/reset.txt
18
19 - #address-cells, #size-cells : should be '1' if the device has sub-nodes
20   with 'reg' property
21
22 - pinctl-names	: A pinctrl state named "default" must be defined
23See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
24
25 - pinctrl-0	: Pin control group
26See: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
27
28 - ranges	: allows valid 1:1 translation between child's address space and
29		  parent's address space
30
31Sub-nodes:
32The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
33example below. The DT binding details of dwc3 can be found in:
34Documentation/devicetree/bindings/usb/snps,dwc3.yaml
35
36NB: The dr_mode property described in [1] is NOT optional for this driver, as the default value
37is "otg", which isn't supported by this SoC. Valid dr_mode values for dwc3-st are either "host"
38or "device".
39
40[1] Documentation/devicetree/bindings/usb/usb-drd.yaml
41
42Example:
43
44st_dwc3: dwc3@8f94000 {
45	compatible	= "st,stih407-dwc3";
46	reg		= <0x08f94000 0x1000>, <0x110 0x4>;
47	reg-names	= "reg-glue", "syscfg-reg";
48	st,syscfg	= <&syscfg_core>;
49	resets		= <&powerdown STIH407_USB3_POWERDOWN>,
50			  <&softreset STIH407_MIPHY2_SOFTRESET>;
51	reset-names	= "powerdown", "softreset";
52	#address-cells	= <1>;
53	#size-cells	= <1>;
54	pinctrl-names	= "default";
55	pinctrl-0	= <&pinctrl_usb3>;
56	ranges;
57
58	dwc3: dwc3@9900000 {
59		compatible	= "snps,dwc3";
60		reg		= <0x09900000 0x100000>;
61		interrupts	= <GIC_SPI 155 IRQ_TYPE_NONE>;
62		dr_mode		= "host";
63		phy-names	= "usb2-phy", "usb3-phy";
64		phys		= <&usb2_picophy2>, <&phy_port2 PHY_TYPE_USB3>;
65	};
66};
67