[U-Boot] [PATCH v2 1/3] usb:ehci-mx6 add board_ehci_usb_mode function

[Marek Vasut]

On Tuesday, November 04, 2014 at 11:50:29 AM, Peng Fan wrote:
> 在 11/4/2014 6:33 PM, Marek Vasut 写道:
> > On Tuesday, November 04, 2014 at 08:50:00 AM, Peng Fan wrote:
> >> Include a weak function board_ehci_usb_mode to gives board code
> >> a choice.
> > 
> > What choice?
> > 
> >> If the board want the otg port work in host mode but not
> >> device mode, this should be handled.
> > 
> > How?
> > 
> > Also, isn't usb_phy_enable() supposed to do exactly this kind of
> > selection between device and host mode ?
> 
> In mx6sxsabresd board, there are two usb port, one used for otg, the
> other used for host. However they are connected to SOC USB controller
> otg1 core and otg2 core respectively. Like following:
> 
> OTG1 CORE <----> board otg port
> OTG2 CORE <----> board host port
> 
> However the board do not have ID pin set for board host port. If just
> use usb_phy_enable, the board host port will not work, because
> "type = usb_phy_enable(index, ehci) ? USB_INIT_DEVICE : USB_INIT_HOST;"
> will always set type with USB_INIT_DEVICE.
> 
> Because i did not find way to handle this situation in
> board/freescale/mx6sxsabresd/mx6sxsabresd.c, add this function to let
> board level code handle handle 'type', if board level code want to set
> it's own 'type'.

This part in usb_phy_enable()

163         return val & USBPHY_CTRL_OTG_ID;

should be replaced by some kind of a board-specific callback then, with
default implmentation being the above (reading the phy ctrl register).

Best regards,
Marek Vasut