linux-kernel - Re: [PATCH 3/3] arm64: dts: mediatek: mt8365-pumpkin: Add overlays for thp7312 cameras

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Message-ID: <20230908205222.GA320762-robh@kernel.org>
Date:   Fri, 8 Sep 2023 15:52:22 -0500
From:   Rob Herring <robh@...nel.org>
To:     Paul Elder <paul.elder@...asonboard.com>
Cc:     linux-media@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/3] arm64: dts: mediatek: mt8365-pumpkin: Add overlays
 for thp7312 cameras

On Wed, Sep 06, 2023 at 08:31:18AM +0900, Paul Elder wrote:
> Add overlays for the Pumpkin i350 to support THP7312 cameras.
> 
> Signed-off-by: Paul Elder <paul.elder@...asonboard.com>
> ---
>  arch/arm64/boot/dts/mediatek/Makefile         |  4 +
>  .../mt8365-pumpkin-common-thp7312.dtsi        | 23 ++++++
>  .../mt8365-pumpkin-csi0-thp7312-imx258.dtso   | 73 +++++++++++++++++++
>  .../mt8365-pumpkin-csi1-thp7312-imx258.dtso   | 73 +++++++++++++++++++
>  4 files changed, 173 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/mediatek/mt8365-pumpkin-common-thp7312.dtsi
>  create mode 100644 arch/arm64/boot/dts/mediatek/mt8365-pumpkin-csi0-thp7312-imx258.dtso
>  create mode 100644 arch/arm64/boot/dts/mediatek/mt8365-pumpkin-csi1-thp7312-imx258.dtso
> 
> diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> index 20570bc40de8..ceaf24105001 100644
> --- a/arch/arm64/boot/dts/mediatek/Makefile
> +++ b/arch/arm64/boot/dts/mediatek/Makefile
> @@ -56,4 +56,8 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += mt8365-evk.dtb
>  dtb-$(CONFIG_ARCH_MEDIATEK) += mt8365-pumpkin.dtb
>  dtb-$(CONFIG_ARCH_MEDIATEK) += mt8516-pumpkin.dtb
>  
> +mtk-mt8365-pumpkin-dtbs := mt8365-pumpkin.dtb mt8365-pumpkin-csi0-thp7312-imx258.dtbo
> +mtk-mt8365-pumpkin-dtbs := mt8365-pumpkin.dtb mt8365-pumpkin-csi1-thp7312-imx258.dtbo
>  mtk-mt8365-pumpkin-dtbs := mt8365-pumpkin.dtb mt8365-pumpkin-ethernet-usb.dtbo

This has no effect. You are assigning the same variable 3 times. It 
needs to be every overlay applied to its base is a *-dtbs variable and 
then those are all added to 'dtb-y'. IOW, we don't allow overlays which 
can't be applied at build time.

Assuming the overlays aren't mutually exclusive, you could do:

mtk-mt8365-pumpkin-dtbs := mt8365-pumpkin.dtb mt8365-pumpkin-ethernet-usb.dtbo
mtk-mt8365-pumpkin-dtbs += mt8365-pumpkin-csi0-thp7312-imx258.dtbo
mtk-mt8365-pumpkin-dtbs += mt8365-pumpkin-csi1-thp7312-imx258.dtbo

This works the same way as '-objs' variables to group .o files into a 
module.

> +
> +dtb-$(CONFIG_ARCH_MEDIATEK) += mtk-mt8365-pumpkin.dtb

Looks like mtk-mt8365-pumpkin.dtb failed to get built before. In any 
case, that's a terrible name. What's the difference between 
mt8365-pumpkin.dtb and mtk-mt8365-pumpkin.dtb? There's no clue.

Rob