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

[Peng Fan]

Hi Marek,

在 11/4/2014 7:01 PM, Marek Vasut 写道:
> 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).
>

How about using the following piece of code?
in ehci-mx6.c

unsigned int __weak board_usb_phy_mode(int index, unsigned int val)
{
	return val & USBPHY_CTRL_OTG_ID;
}

replace "return val & USBPHY_CTRL_OTG_ID;" using "
return board_usb_phy_mode(index, val);"

In board file,
unsigned int board_usb_phy_mode(int index, unsigned int val)
{
	if (index == 1)
		return 0; /* HOST */
	else
		return 1; /* DEVICE */
}

> Best regards,
> Marek Vasut
>
Regards,
Peng.