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

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Message-ID: <wbsg3fmco6rwjj7vtiqtqv7trfjor73j7rjx7efnlafo4pz4bc@awixm2iygd55>
Date: Thu, 28 Nov 2024 15:28:13 +0530
From: s-vadapalli <s-vadapalli@...com>
To: Enric Balletbo i Serra <eballetb@...hat.com>
CC: s-vadapalli <s-vadapalli@...com>, 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

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.

Regards,
Siddharth.