Generic USB PHY (<tt>phye-generic-usb.c</tt>)

Minimal PHY provider for **usb-nop-xceiv** — reset, clock, and regulators without complex **set_mode**.

Kconfig: **RT_PHYE_GENERIC_USB** (requires **RT_USING_PHYE**).

Device tree

usb_phy: usb-phy {
    compatible = "usb-nop-xceiv";
    clocks = <&usb_clk>;
    clock-frequency = <24000000>;
    vcc-supply = <&usb_vcc>;
    vbus-supply = <&usb_vbus>;   /* optional */
    reset-gpios = <&gpio PHY_RST GPIO_ACTIVE_LOW>;
};

Consumer (e.g. DWC3):

usb3: usb@... {
    phys = <&usb_phy>;
    phy-names = "usb";
};

Operations

`rt_phye_ops`	Behavior
`power_on`	`vcc` enable → `clk_prepare_enable` → `reset` pulse (15 ms assert, 20 ms deassert)
`power_off`	`vcc` disable, clock off
`reset`	GPIO reset only

No **init**, **exit**, or **set_mode** — USB mode assumed fixed after power-on.

Probe flow

**reset** GPIO from **reset-gpios**
**main_clk** via **rt_clk_get_by_name**; optional **clock-frequency**
**vcc**, **vbus** regulators — **vbus** enabled at probe if present
**rt_phye_register**

**INIT_PLATFORM_EXPORT(generic_usb_phy_drv_register)** — registers platform driver at init.

Consumer usage

phy = rt_phye_get_by_name(dev, "usb");
rt_phye_power_on(phy);   /* often sufficient for nop-xceiv */
/* start USB controller */

Use **rt_phye_init** only if provider adds **init** later.

Pitfalls