linux-kernel - Re: [PATCH] arm64: dts: ti: k3-am69-sk: Add USB SuperSpeed support

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Message-ID: <CALE0LRvZNnNJ8jBG35bU8Ev5Fvr2400O5qXUsRn0zufkidJeJw@mail.gmail.com>
Date: Tue, 3 Dec 2024 16:29:02 +0100
From: Enric Balletbo i Serra <eballetb@...hat.com>
To: s-vadapalli <s-vadapalli@...com>
Cc: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Dasnavis Sabiya <sabiya.d@...com>
Subject: Re: [PATCH] arm64: dts: ti: k3-am69-sk: Add USB SuperSpeed support

Hi,

On Thu, Nov 28, 2024 at 10:58 AM s-vadapalli <s-vadapalli@...com> wrote:
>
> On Thu, Nov 28, 2024 at 10:47:42AM +0100, Enric Balletbo i Serra wrote:
> > Hi,
>
> [...]
>
> > So I changed the dr_mode to otg instead of host and tried to configure
> > a usb mass storage gadget but unfortunately didn't work, but this
> > could be a driver problem, I got the following error
> >
> >   UDC core: g1: couldn't find an available UDC
> >
> > As the devicetree should describe the hardware, and as far as I can
> > see it should support the type-c port act as a gadget, I'm fine with
> > changing the dr_mode, unless anyone have more information about this,
> > the thing that makes me think a bit more is that, in the TI kernel
> > this is set to host, so I'm wondering if I'm missing something or is
> > just that was never tested.
>
> Are all interfaces (Type-A and Type-C) functional as Host when the
> dr_mode is set to "otg"? (Do USB devices connected to the interfaces
> enumerate on AM69-SK?) If yes, then it could be a DIP Switch setting
> that is related to OTG mode of operation or a USB-C Mux that needs to be
> configured.
>

Yes, all interfaces (Type-A and Type-C) are functional as host when
the dr_mode is set to "otg". Looking at SK-AM69 Processor Start Kit
User's Guide (Rev. A) [1] I don't see any DIP Switch related to the
OTG  mode. Looks like the type-c connector connects directly to the
SoC through a USB HUB (TUSB4041).

[1] https://www.ti.com/lit/ug/spruj70a/spruj70a.pdf?ts=1733215039014

Regards,
  Enric

> Regards,
> Siddharth.
>