[RFC] musb: removing otg protocol support

[Bin Liu <b-liu@ti.com>]

On Sun, Mar 18, 2018 at 05:36:10PM +0100, Hans de Goede wrote:
> Hi,
> 
> On 18-03-18 14:16, Greg Kroah-Hartman wrote:
> >On Fri, Mar 16, 2018 at 02:09:51PM -0500, Bin Liu wrote:
> >>Hi,
> >>
> >>The kernel usb stack and musb drivers have gone through some changes in
> >>the past several kernel versions, such as adding otg fsm, musb runtime
> >>PM, and musb otg state moving from musb to musb->xceiv... I am wondering
> >>if the otg protocol (hnp, srp) functions are already broken in the musb
> >>drivers, but I don't have a platform to confirm it.
> >>
> >>Do we know by any chance there is still someone using the musb otg
> >>functions in any relatively newer kernel and we still need to support
> >>otg in musb?  If not, I am thinking to clean up the otg functions in
> >>musb drivers to make the code easy to read and maintain.
> >
> >By "clean up" do you mean "delete it"?  :)
> >
> >I don't know of any real OTG hardware that ever shipped, does anyone
> >else?
> 
> I'm not aware of any hardware using the fancier otg functions such as
> role-swapping, etc. either. From an Allwinner pov as long as you keep

Thanks for confirming ;)

> plain gadget and host mode as controlled by the id pin work, I'm happy.

Yes, this is not changed.

> Note I'm not really involved in Allwinnner stuff anymore, so if you
> want some testing of the cleanup, you should probably ask the
> free-electron (now bootlin.com) people.

Thanks, but I am not sure how I can find the exact individual contects.

Regards,
-Bin.
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