Re: [PATCH 1/3] dt-bindings: usb: ci-hdrc-usb2: add property disable-runtime-pm

[Philippe Schenker]

On Fri, 2020-07-10 at 12:56 -0300, Fabio Estevam wrote:
> Hi Philippe,
> 
> On Fri, Jul 10, 2020 at 12:51 PM Philippe Schenker
> <philippe.schenker@xxxxxxxxxxx> wrote:
> > Chipidea depends on some hardware signals to be there in order
> 
> I think this description is too vague.
> 
> Could you please provide more details so that a user can know if their
> hardware falls into this category?
> 
> It is not clear from seeing this series what is the hardware details
> that would require this property to be used.

Hi Fabio, Peter,

I tried to keep the description for this patch somewhat general. But as
Peter suggested I will add Toradex's use-case for this.

The problem with Colibri iMX6ULL is that we are stuck with a legacy
module standard that does only include one USB host/device switching
signal. Plus on that specific module we have no 5V available hence left
the connection of VBUS signal away.
This works normally pretty well but for our "dual-role OTG" port I could
not make it work with runtime-pm running and proper extcon
configuration. The problem was, when plugging in something in device or
host mode gets not enumerated and detected.

That are the reasons why I believe the PHY or something else in Chipidea
needs a signal that it does not have on that module that would wake the
whole thing from runtime-suspend.

I will think about a better description and send a v2

Thanks
Philippe