[U-Boot] [RFC PATCH 0/7] RFC: dm: Add USB support

[Simon Glass]

Hi Marek,

On 9 February 2015 at 14:02, Marek Vasut <marex at denx.de> wrote:
> On Friday, January 30, 2015 at 11:41:33 PM, Simon Glass wrote:
>> Hi Marek,
>
> Hi!
>
>> On 30 January 2015 at 15:16, Marek Vasut <marex at denx.de> wrote:
>> > On Friday, January 30, 2015 at 08:04:50 PM, Simon Glass wrote:
>> > > This series adds basic driver model support to USB. The intent is to
>> > > permit the various subsystems (OHCI, EHCI, XHCI) to co-exist and allow
>> > > any number of USB ports of different types. So far the absolute limit
>> > > on the number of USB devices is only slightly relaxed.
>> > >
>> > > Only USB controllers have a real driver model device. USB devices
>> > > (including the hub in the controller) are not modelled as driver model
>> > > devices. This is for two reasons:
>> > >
>> > > - it is easier since we don't need to bind a whole lot of devices when
>> > >
>> > >     scanning
>> > >
>> > > - the two main USB devices (block devices and Ethernet) don't have
>> > > driver
>> > >
>> > >     mode support yet anyway, so it would be pointless. However the
>> > >     recent network RFC has encouraged me to send this.
>> > >
>> > > The basic approach is to set up the driver model structures in parallel
>> > > to what already exists rather than to replace them. This allows both
>> > > driver model and legacy to be used for USB, although not with the same
>> > > board.
>> > >
>> > > So far only XHCI is supported. As an example the Exynos XHCI driver is
>> > > converted to driver model.
>> > >
>> > > I would appreciate comments before going further.
>> > >
>> > > Caveats:
>> > > - sandbox code is incomplete and there are no tests
>> > > - 'usb stop' does not remove existing devices (I have not yet settled
>> > > on the best approach)
>> > > - the usb.h changes need to be split correctly into the patches once
>> > > they
>> > >
>> > >   are final
>> > >
>> > > This series is available at u-boot-dm/usb-working.
>> >
>> > Hi!
>> >
>> > I'll look at this by the end of next week, I will be free by then. It's
>> > not possible for me to do it earlier, sorry. Does this still work for
>> > you please?
>>
>> Definitely, that sounds good. I was planning to leave it a week or two
>> anyway, although I might fiddle more with the sandbox side in the
>> meantime.
>
> I skimmed through the series finally, it looks mostly good for but a few
> minor coding style things. I would prefer if this went in for the next MW,
> what do you think please ?

Sounds good, hopefully we can bring in wider driver support too. I'd
like to get this lot in before thinking too hard about how to deal
with actual devices! Maybe we can target getting this series cleaned
up and into u-boot-dm/next by end of Feb?

Regards,
Simon