Could somebody please fix gmane as it is hard to work without it! Plus nowhere on the linux-usb website the actual mailing list address is given! -------- Forwarded Message -------- From: Marcel Ziswiler <marcel.ziswiler@xxxxxxxxxxx> To: Thierry Reding <thierry.reding@xxxxxxxxx>, Dmitry Osipenko <digetx@ gmail.com> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>, Felipe Balbi <balbi@kern el.org>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Peter Chen <P eter.Chen@xxxxxxx>, Jonathan Hunter <jonathanh@xxxxxxxxxx>, Marc Dietrich <marvin24@xxxxxx>, Nicolas Chauvet <kwizart@xxxxxxxxx>, linux- usb-devel@xxxxxxxxxxxxxxx, linux-tegra@xxxxxxxxxxxxxxx, Stephen Warren <swarren@xxxxxxxxxxxxx> Subject: Re: [PATCH v1 0/9] Support UDC on Tegra 20/30/114/124 Date: Thu, 06 Jul 2017 15:04:37 +0200 On Thu, 2017-07-06 at 14:03 +0200, Thierry Reding wrote: > On Thu, Jul 06, 2017 at 02:20:04AM +0300, Dmitry Osipenko wrote: > > On 06.07.2017 01:54, Stephen Warren wrote: > > > On 07/05/2017 04:13 PM, Dmitry Osipenko wrote: > > > > On 05.07.2017 23:31, Stephen Warren wrote: > > > > > On 07/05/2017 11:19 AM, Dmitry Osipenko wrote: > > > > > > Some time ago Thierry Reding sent out patches that enabled > > > > > > UDC on NVIDIA > > > > > > Tegra, unfortunately they haven't got enough traction to > > > > > > get into the > > > > > > kernel. I've rebased those patches and added a fix for the > > > > > > Ethernet USB > > > > > > Gadget on Tegra20, Marc Dietrich tested UDC driver on AC100 > > > > > > and Nicolas > > > > > > Chauvet on TK1. Like an original patchset, this series adds > > > > > > support for > > > > > > the peripheral mode only. > > > > > > > > > > Does this mean that the relevant ports no longer support host > > > > > mode? That's going > > > > > to be a user-visible regression, which doesn't sound like a > > > > > good idea. Isn't OTG > > > > > possible instead? > > > > > > > > We are going to switch only AC100 and TrimSlice to use the UDC > > > > driver. > > > > > > Really? I saw patches in the series for Beaver, Dalmore, and > > > Jetson TK1 too. > > > > > > > Yes, the "PHY" and "EHCI" nodes are disabled on those boards in DT. > > > > > > Do you > > > > know whether that port is working in a host mode with the > > > > tegra-ehci driver on > > > > these devices? > > > > > > If any USB port is enabled in the DT, it was certainly validated > > > at some point. > > > IIRC, we only have host mode enabled at present. So, yes, I'd > > > expect this port > > > to work in host mode currently without any issue. > > > > > > > Okay, so we have to decide whether it's reasonable to switch AC100 > > and TrimSlice > > to the peripheral mode. I think realistically chances that someone > > uses that > > port in a host mode are quite low, while it works fine and probably > > more useful > > in a device mode. > > Judging by this: > > http://trimslice.com/download/documentation/trim-slice-man.pdf > > at least TrimSlice doesn't seem to implement OTG, so we'd have to > make a > choice to support either host or peripheral mode. I guess technically > it > would need to be peripheral mode because pin 4 is not connected. > > Does a similar document exist for AC100? Judging by the Compal PAZ00 schematics it does indeed have an ID pin which is connected to the mini USB socket. USB1_ID1: From Connector USB1_ID2: From EC So an alternative possibility to switch device/host mode would be from the EC (;-p). > Thierry Cheers Marcel��.n��������+%������w��{.n�����{���)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
