linux-kernel - Re: [PATCH v2 3/7] arm64: dts: mt8183: Add kukui katsu board

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Date:   Wed, 25 Oct 2023 10:25:33 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>,
        Bernhard Rosenkränzer <bero@...libre.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Macpaul Lin <macpaul.lin@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 3/7] arm64: dts: mt8183: Add kukui katsu board

Il 24/10/23 23:22, Hsin-Yi Wang ha scritto:
> katsu is also known as ASUS Chromebook Detachable CZ1.
> 
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
> v1->v2: non sku38 is sku32
> ---
>   arch/arm64/boot/dts/mediatek/Makefile         |  2 +
>   .../dts/mediatek/mt8183-kukui-katsu-sku32.dts | 40 +++++++++++++++++
>   .../dts/mediatek/mt8183-kukui-katsu-sku38.dts | 44 +++++++++++++++++++
>   3 files changed, 86 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/mediatek/mt8183-kukui-katsu-sku32.dts
>   create mode 100644 arch/arm64/boot/dts/mediatek/mt8183-kukui-katsu-sku38.dts
> 
> diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> index e6e7592a3645..a13419e67e8e 100644
> --- a/arch/arm64/boot/dts/mediatek/Makefile
> +++ b/arch/arm64/boot/dts/mediatek/Makefile
> @@ -36,6 +36,8 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-jacuzzi-willow-sku0.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-jacuzzi-willow-sku1.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-kakadu.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-kakadu-sku22.dtb
> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-katsu-sku32.dtb
> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-katsu-sku38.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-kodama-sku16.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-kodama-sku272.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt8183-kukui-kodama-sku288.dtb
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui-katsu-sku32.dts b/arch/arm64/boot/dts/mediatek/mt8183-kukui-katsu-sku32.dts
> new file mode 100644
> index 000000000000..9fa205c06c74
> --- /dev/null
> +++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui-katsu-sku32.dts
> @@ -0,0 +1,40 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright 2023 Google LLC
> + */
> +
> +/dts-v1/;
> +#include "mt8183-kukui-kakadu.dtsi"
> +#include "mt8183-kukui-audio-da7219-rt1015p.dtsi"
> +
> +/ {
> +	model = "Google katsu board";
> +	chassis-type = "tablet";
> +	compatible = "google,katsu-sku32", "google,katsu", "mediatek,mt8183";
> +};
> +
> +&i2c0 {
> +	status = "okay";
> +

The i2c0 node already inherits status = "okay" from mt8183-kukui-kakadu.dtsi,
this is redundant.

> +	/delete-node/touchscreen@10;

You can definitely avoid those ugly /delete-node/ statements: if you check more
closely, mt8183-kukui-kakadu.dtsi is used by only two *.dts files.

I would propose to move the touchscreen@10 node from kakadu.dtsi to kakadu.dts
and kakadu-sku22.dts: in my opinion, that will make things more readable, as
every board defines its own touchscreen.

It would be a different story if we had to duplicate that @10 node for something
like five times or more, but that's not the case.

> +	touchscreen1: touchscreen@5d {
> +		compatible = "goodix,gt7375p";
> +		reg = <0x5d>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&open_touch>;
> +

This....

> +		interrupt-parent = <&pio>;
> +		interrupts = <155 IRQ_TYPE_LEVEL_LOW>;

...should be done in one line, like so:

		interrupts-extended = <&pio 155 IRQ_TYPE_LEVEL_LOW>;

> +
> +		reset-gpios = <&pio 156 GPIO_ACTIVE_LOW>;
> +		vdd-supply = <&lcd_pp3300>;
> +	};
> +};
> +
> +&panel {
> +	compatible = "starry,2081101qfh032011-53g";

Actually, same comment goes for the panel node: kakadu.dtsi defines a panel
compatible "boe,tv105wum-nw0" but then you're overriding it here with the
starry panel.

You could leave the status = "okay" in kakadu.dtsi and move the panel compatible
to each *.dts board file, therefore increasing readability.

> +};
> +
> +&qca_wifi {
> +	qcom,ath10k-calibration-variant = "GO_KATSU";
> +};

Same comment applies to sku38, of course.

Regards,
Angelo