linux-kernel - Re: [PATCH v6 15/28] ARM: tegra: Add usb-role-switch property to USB OTG ports

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Date:   Wed, 15 Dec 2021 14:14:39 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        David Heidelberg <david@...t.cz>,
        Svyatoslav Ryhel <clamor95@...il.com>,
        Anton Bambura <jenneron@...tonmail.com>,
        Antoni Aloy Torrens <aaloytorrens@...il.com>,
        Nikola Milosavljevic <mnidza@...look.com>,
        Ion Agorria <ion@...rria.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Ihor Didenko <tailormoon@...bler.ru>,
        Andreas Westman Dorcsak <hedmoo@...oo.com>,
        Maxim Schwalm <maxim.schwalm@...il.com>,
        Raffaele Tranquillini <raffaele.tranquillini@...il.com>,
        Jasper Korten <jja2000@...il.com>,
        Thomas Graichen <thomas.graichen@...il.com>,
        Stefan Eichenberger <stefan.eichenberger@...adex.com>,
        Stefan Agner <stefan@...er.ch>,
        Peter Geis <pgwipeout@...il.com>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 15/28] ARM: tegra: Add usb-role-switch property to USB
 OTG ports

On Sun, Dec 12, 2021 at 12:13:59AM +0300, Dmitry Osipenko wrote:
> From: Stefan Eichenberger <stefan.eichenberger@...adex.com>
> 
> If an USB port is an OTG port, then we should add the usb-role-switch
> property. Otherwise XUSB setup fails and therefore padctl is unable to
> set up the ports. This leads to broken USB and PCIe ports. Add the
> usb-role-switch properties to Tegra124 device-trees to fix the problem.
> 
> The error message shown without this patch is e.g:
> usb2-0: usb-role-switch not found for otg mode
> 
> [digetx@...il.com: improved commit message]
> Tested-by: Thomas Graichen <thomas.graichen@...il.com> # T124 Nyan Big
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@...adex.com>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  arch/arm/boot/dts/tegra124-apalis-v1.2.dtsi | 1 +
>  arch/arm/boot/dts/tegra124-apalis.dtsi      | 1 +
>  arch/arm/boot/dts/tegra124-nyan.dtsi        | 1 +
>  arch/arm/boot/dts/tegra124-venice2.dts      | 2 +-
>  4 files changed, 4 insertions(+), 1 deletion(-)

The device tree bindings for the XUSB pad controller say that when this
property is set, then the "connector" subnode should also exist.

Any chance we can add that? I was planning on making that a dependency
in the json-schema conversion of the binding, in which case it would be
more of a "must" than a "should".

Thierry

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