[PATCH 08/11] MXS: Add imx-otg driver

[Chen Peter-B29397]

> 
> There is more to be confused about -- you don't get the host/device
> connection
> interrupt from the PHY, but you dig one of them from the EHCI host and
> the other
> from the EHCI host too -- which is pretty messed up already.
> 
> We can certainly use IRQF_SHARED to trap some of the interrupts in the
> PHY code,
> but that's still quite weird.
> 
Below need to be implemented at phy driver:
- struct usb_phy;
- phy's interrupt which is only used for handle wakeup issue,
PHY's interrupt line is NOT the same with controller's, so you don't
need to use IRQF_SHARED, and request the same irq with controller's.

Below need to be implemented at otg driver:
- struct usb_otg;
- manage PHY through PHY interfaces which are implemented at phy driver.
- OTG interrupt, it only handles ID/vbus interrupt.
- OTG switch routine, it handles host and device's add/remove operation due to
id/vbus change and some operation_mode defined at platform_data or DT in fture.


> > Sascha
> 
> Best regards,
> Marek Vasut