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

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Date:   Tue, 12 Sep 2023 14:09:29 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     Vignesh Raman <vignesh.raman@...labora.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     guilherme.gallo@...labora.com, sergi.blanch.torne@...labora.com,
        daniels@...labora.com, emma@...olt.net, robdclark@...il.com,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Maxime Ripard <mripard@...nel.org>,
        David Heidelberg <david.heidelberg@...labora.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: apq8016-sbc: Add overlay for usb host
 mode



On 11/09/2023 13:15, 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.

Just a context for others, this was part of this patch series 
https://lore.kernel.org/r/20230908152225.432139-1-vignesh.raman@collabora.com

> 
> Add an overlay dtso file that sets the dr_mode to host, allowing the
> USB controllers to work in host mode. With commit 15d16d6dadf6
> ("kbuild: Add generic rule to apply fdtoverlay"), overlay target can
> be used to simplify the build of DTB overlays. It uses fdtoverlay to
> merge base device tree with the overlay dtso. apq8016-sbc-usb-host.dtb
> file can be used by drm-ci, mesa-ci.
> 
> 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>

Acked-by: Helen Koike <helen.koike@...labora.com>


> ---
>   arch/arm64/boot/dts/qcom/Makefile                  | 4 ++++
>   arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso | 8 ++++++++
>   2 files changed, 12 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index 2cca20563a1d..99190a6ba6ff 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -1,5 +1,9 @@
>   # SPDX-License-Identifier: GPL-2.0
>   dtb-$(CONFIG_ARCH_QCOM)	+= apq8016-sbc.dtb
> +
> +apq8016-sbc-usb-host-dtbs	:= apq8016-sbc.dtb apq8016-sbc-usb-host.dtbo
> +
> +dtb-$(CONFIG_ARCH_QCOM)	+= apq8016-sbc-usb-host.dtb
>   dtb-$(CONFIG_ARCH_QCOM)	+= apq8016-sbc-d3-camera-mezzanine.dtb
>   dtb-$(CONFIG_ARCH_QCOM)	+= apq8039-t2.dtb
>   dtb-$(CONFIG_ARCH_QCOM)	+= apq8094-sony-xperia-kitakami-karin_windy.dtb
> 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";
> +};