usb: fsl-mph-dr-of: add regulator support

Some devices have a GPIO that controls power to the USB bus. Add
support for a vbus regulator to have the kernel control it automatically
instead of having to rely on userspace.

Acquire the regulator in the common probe path so that it works for
all fsl-usb2-dr compatible controllers, not just MPC5121.

Tested on a TP-LINK WDR4900v1 by adding roughly the following

reg_power_usb: regulator {
	compatible = "regulator-fixed";
	regulator-name = "power_usb";
	regulator-min-microvolt = <5000000>;
	regulator-max-microvolt = <5000000>;
	gpios = <&gpio0 10 GPIO_ACTIVE_HIGH>;
	enable-active-high;
	regulator-boot-on;
};

uhubctl and rmmod both turn USB power off.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20260630195144.88122-1-rosenp@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions