[U-Boot] [PATCH RFC 0/2] usb: host: Add a wrapper layer for mutiple host support

[Marek Vasut]

On Wednesday, June 25, 2014 at 07:11:42 AM, Vivek Gautam wrote:
> Hi Marek,
> 
> On Tue, Jun 24, 2014 at 7:56 PM, Marek Vasut <marex at denx.de> wrote:
> > On Tuesday, June 24, 2014 at 04:10:20 PM, Vivek Gautam wrote:
> >> Hi Marek,
> >> 
> >> It's been very long since we had discussion for introducing the wrapper
> >> layer to enable using multiple usb controller types.
> >> Its been unfortunate that i had been busy with other tasks, and couldn't
> >> look into this.
> >> Now that i got sometime, i have prepared a simple RFC patch which right
> >> now supports APIs translation for submit_control_msg(),
> >> submit_bulk_msg(), submit_int_msg(), and usb_lowlevel_init() as well as
> >> usb_lowlevel_stop(). This was the simplest approach that could
> >> differentiate between controller types.
> >> 
> >> I had thought of another approach too, wherein there's a 'list' passed
> >> by the usb core layer, which would be filled with 'host_controller_drv'
> >> structure, that would contain information about the driver. And then
> >> each host controller driver will register certain callbacks that can be
> >> called from the upper layers. If you say i will send an RFC for this
> >> approach.
> > 
> > I think this approach in this patchset will not play well with the driver
> > model. Instead, I'd love to see a mean to instantiate each *HCI
> > controller and have a USB core which would track those instances. The
> > USB core would then be able to call whatever generic ops on those
> > instances as needed. Does that make sense please ?
> 
> True, i understand your point here. I think the second approach i was
> talking of, goes in this direction.
> I think i could not put it well in words there.
> 
> I will prepare an RFC patch for that, and post it as soon as its
> ready, so that you can have
> a look.

Ah, this would be so very appreciated! Thank you!

Best regards,
Marek Vasut