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Samsung Exynos SoC USB controller
The USB devices interface with USB controllers on Exynos SOCs.
The device node has following properties.
EHCI
Required properties:
- compatible: should be "samsung,exynos4210-ehci" for USB 2.0
EHCI controller in host mode.
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
- clocks: from common clock binding: handle to usb clock.
- clock-names: from common clock binding: Shall be "usbhost".
- phys: from the *Generic PHY* bindings; array specifying phy(s) used
by the root port.
- phy-names: from the *Generic PHY* bindings; array of the names for
each phy for the root ports, must be a subset of the following:
"host", "hsic0", "hsic1".
Optional properties:
- samsung,vbus-gpio: if present, specifies the GPIO that
needs to be pulled up for the bus to be powered.
Example:
usb@12110000 {
compatible = "samsung,exynos4210-ehci";
reg = <0x12110000 0x100>;
interrupts = <0 71 0>;
samsung,vbus-gpio = <&gpx2 6 1 3 3>;
clocks = <&clock 285>;
clock-names = "usbhost";
phys = <&usb2phy 1>;
phy-names = "host";
};
OHCI
Required properties:
- compatible: should be "samsung,exynos4210-ohci" for USB 2.0
OHCI companion controller in host mode.
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
- clocks: from common clock binding: handle to usb clock.
- clock-names: from common clock binding: Shall be "usbhost".
- phys: from the *Generic PHY* bindings; array specifying phy(s) used
by the root port.
- phy-names: from the *Generic PHY* bindings; array of the names for
each phy for the root ports, must be a subset of the following:
"host", "hsic0", "hsic1".
Example:
usb@12120000 {
compatible = "samsung,exynos4210-ohci";
reg = <0x12120000 0x100>;
interrupts = <0 71 0>;
clocks = <&clock 285>;
clock-names = "usbhost";
phys = <&usb2phy 1>;
phy-names = "host";
};
DWC3
Required properties:
- compatible: should be one of the following -
"samsung,exynos5250-dwusb3": for USB 3.0 DWC3 controller on
Exynos5250/5420.
"samsung,exynos5433-dwusb3": for USB 3.0 DWC3 controller on
Exynos5433.
"samsung,exynos7-dwusb3": for USB 3.0 DWC3 controller on Exynos7.
- #address-cells, #size-cells : should be '1' if the device has sub-nodes
with 'reg' property.
- ranges: allows valid 1:1 translation between child's address space and
parent's address space
- clocks: Clock IDs array as required by the controller.
- clock-names: Names of clocks corresponding to IDs in the clock property.
Following clock names shall be provided for different
compatibles:
- samsung,exynos5250-dwusb3: "usbdrd30",
- samsung,exynos5433-dwusb3: "aclk", "susp_clk", "pipe_pclk",
"phyclk",
- samsung,exynos7-dwusb3: "usbdrd30", "usbdrd30_susp_clk",
"usbdrd30_axius_clk"
- vdd10-supply: 1.0V powr supply
- vdd33-supply: 3.0V/3.3V power supply
Sub-nodes:
The dwc3 core should be added as subnode to Exynos dwc3 glue.
- dwc3 :
The binding details of dwc3 can be found in:
Documentation/devicetree/bindings/usb/dwc3.txt
Example:
usb@12000000 {
compatible = "samsung,exynos5250-dwusb3";
clocks = <&clock 286>;
clock-names = "usbdrd30";
#address-cells = <1>;
#size-cells = <1>;
ranges;
vdd10-supply = <&ldo11_reg>;
vdd33-supply = <&ldo9_reg>;
dwc3 {
compatible = "synopsys,dwc3";
reg = <0x12000000 0x10000>;
interrupts = <0 72 0>;
usb-phy = <&usb2_phy &usb3_phy>;
};
};
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