Re: [RFC usb-next v5 2/3] usb: core: add a wrapper for the USB PHYs on the root-hub
From: Alan Stern <hidden>
Date: 2017-10-09 17:16:03
Also in:
linux-amlogic
On Sun, 8 Oct 2017, Martin Blumenstingl wrote:
Many SoC platforms have separate devices for the USB PHY which are registered through the generic PHY framework. These PHYs have to be enabled to make the USB controller actually work. They also have to be disabled again on shutdown/suspend.
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quoted hunk
--- /dev/null +++ b/drivers/usb/core/phy.h@@ -0,0 +1,7 @@ +struct usb_phy_roothub; + +struct usb_phy_roothub *usb_phy_roothub_init(struct device *dev); +int usb_phy_roothub_exit(struct usb_phy_roothub *phy_roothub); + +int usb_phy_roothub_power_on(struct usb_phy_roothub *phy_roothub); +int usb_phy_roothub_power_off(struct usb_phy_roothub *phy_roothub);
Have you considered the possibility that a phy might need three power states, for on, off, and suspended? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html