linux-kernel - Re: [PATCH v3 2/9] arm64: dts: qcom: apq8016-sbc: Add overlay for usb host mode

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Date:   Mon, 11 Sep 2023 09:56:36 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Vignesh Raman <vignesh.raman@...labora.com>
Cc:     dri-devel@...ts.freedesktop.org, helen.koike@...labora.com,
        guilherme.gallo@...labora.com, sergi.blanch.torne@...labora.com,
        david.heidelberg@...labora.com, daniels@...labora.com,
        gustavo.padovan@...labora.com,
        angelogioacchino.delregno@...labora.com, emma@...olt.net,
        robclark@...edesktop.org, robdclark@...gle.com, anholt@...gle.com,
        robdclark@...il.com, airlied@...il.com, daniel@...ll.ch,
        jani.nikula@...ux.intel.com, dmitry.baryshkov@...aro.org,
        matthias.bgg@...il.com, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 2/9] arm64: dts: qcom: apq8016-sbc: Add overlay for
 usb host mode

On Fri, Sep 08, 2023 at 08:52:18PM +0530, Vignesh Raman wrote:
> Due to the presence of the fastboot micro cable in the CI farm,
> it causes the hardware to remain in gadget mode instead of host mode.
> So it doesn't find the network, which results in failure to mount root
> fs via NFS.
> 
> Add an overlay dtso file that sets the dr_mode to host, allowing
> the USB controllers to work in host mode. This dtso file will be used
> in drm-ci, mesa-ci.
> 
> Overlay DT file uses the sugar syntax [suggested by Dmitry Baryshkov and Maxime Ripard]
> 
> Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Suggested-by: Maxime Ripard <mripard@...nel.org>
> Signed-off-by: Helen Koike <helen.koike@...labora.com>
> Signed-off-by: David Heidelberg <david.heidelberg@...labora.com>
> Signed-off-by: Vignesh Raman <vignesh.raman@...labora.com>
> ---
> 
> v3:
>   - New patch in the series to add device tree overlay in arch/arm64/boot/dts/qcom
> 
> ---
>  arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso | 8 ++++++++
>  1 file changed, 8 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso
> 
> diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso b/arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso
> new file mode 100644
> index 000000000000..a82c26b7eae8
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso
> @@ -0,0 +1,8 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +
> +/dts-v1/;
> +/plugin/;
> +
> +&usb {
> +         dr_mode = "host";
> +};
> -- 
> 2.40.1
> 

You need to add it to the Makefile too

Maxime

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