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

[Marek Vasut]

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 ?

Best regards,
Marek Vasut