Messages in this thread | | | From | Philippe Schenker <> | Subject | Re: [PATCH 1/3] dt-bindings: usb: ci-hdrc-usb2: add property disable-runtime-pm | Date | Mon, 13 Jul 2020 08:20:09 +0000 |
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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@toradex.com> 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
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