[PATCH v7 0/2] ohci and ehci-platform clks, phy and dt support

On Sat, 18 Jan 2014, Hans de Goede wrote:

quoted

A simple copy from the PPC driver isn't quite enough, because the
platform data settings would override the DT values.
ehci_platform_reset has to be changed so that it sets
ehci->big_endian_desc and _mmio if the pdata flags are set, but
otherwise leaves them alone.

Hans, would you like to write another patch to take care of this?

I already took a quick look at this, setting the ehci->big_endian* flags is easy,
the problem is that they won't work unless we also define
CONFIG_USB_EHCI_BIG_ENDIAN_DESC and CONFIG_USB_EHCI_BIG_ENDIAN_MMIO

That's right.  The platforms have to define those symbols if they use 
big-endian values (or even worse, mixed endian).

I would like to avoid doing something like the ugliness we've with
USB_OHCI_HCD_PPC_OF_BE and USB_OHCI_HCD_PPC_OF_LE, which means just selecting these
2 config options whenever USB_EHCI_HCD_PLATFORM is enabled, but I'm not sure if that
is acceptable.

At the moment, I don't think it's so terrible.  That ohci_ppc ugliness
probably could have been avoided originally.  It looks like an attempt
to make sure you don't end up matching the hardware to a driver built
with the wrong endianness.  I imagine it would be less messy to detect 
that sort of problem at runtime.

The same goes for the ohci code btw.

Certainly.

Alan Stern