linux-kernel - Re: [PATCH v2 5/6] arm64: dts: qcom: apq8016-sbc-d3-camera-mezzanine: Move default ov5640 to a standalone dts

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Date:   Thu, 10 Aug 2023 17:11:57 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, loic.poulain@...aro.org, rfoss@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/6] arm64: dts: qcom:
 apq8016-sbc-d3-camera-mezzanine: Move default ov5640 to a standalone dts

Hi,

just some nitpicks. Some of them were present before already but maybe
you can prepend or append another cleanup patch while at it. :)

On Wed, Aug 09, 2023 at 09:23:42PM +0100, Bryan O'Donoghue wrote:
> At the moment we define a single ov5640 sensor in the apq8016-sbc and
> disable that sensor.
> 
> The sensor mezzanine for this is a D3 Engineering Dual ov5640 mezzanine
> card. Move the definition from the apq8016-sbc where it shouldn't be to a
> standalone dts.
> 

I wonder what would be required to implement this using a DT overlay,
rather than a standalone separate DT? Seems like there are some .dtso
files in upstream Linux.

I'm also fine with the separate DTB personally, though.

> Enables the sensor by default, as we are adding a standalone mezzanine
> structure.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/Makefile             |  1 +
>  .../qcom/apq8016-sbc-d3-camera-mezzanine.dts  | 55 +++++++++++++++++++
>  arch/arm64/boot/dts/qcom/apq8016-sbc.dts      | 49 -----------------
>  3 files changed, 56 insertions(+), 49 deletions(-)
>  create mode 100644 arch/arm64/boot/dts/qcom/apq8016-sbc-d3-camera-mezzanine.dts
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index f15548dbfa56e..19016765ba4c6 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -1,5 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  dtb-$(CONFIG_ARCH_QCOM)	+= apq8016-sbc.dtb
> +dtb-$(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
>  dtb-$(CONFIG_ARCH_QCOM)	+= apq8096-db820c.dtb
> diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc-d3-camera-mezzanine.dts b/arch/arm64/boot/dts/qcom/apq8016-sbc-d3-camera-mezzanine.dts
> new file mode 100644
> index 0000000000000..ef0e76e424898
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc-d3-camera-mezzanine.dts
> @@ -0,0 +1,55 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) 2023, Linaro Ltd.
> + */

I assume you have permission from the original contributor to relicense
this? apq8016-sbc.dts is GPL.

> +
> +/dts-v1/;
> +
> +#include "apq8016-sbc.dts"
> +

Please also move the fixed regulators here, they're part of the
mezzanine, not the DB410c.

> +&camss {
> +	status = "okay";
> +
> +	ports {
> +		port@0 {
> +			reg = <0>;
> +			csiphy0_ep: endpoint {
> +				data-lanes = <0 2>;
> +				remote-endpoint = <&ov5640_ep>;
> +				status = "okay";

Should be unneeded since it's not set to disabled anywhere?

> +			};
> +		};
> +	};
> +};
> +
> +&cci {
> +	status = "okay";
> +};
> +
> +&cci_i2c0 {
> +	camera_rear@3b {

camera@

Thanks,
Stephan