linux-kernel - Re: [PATCH v3 2/2] arm64: dts: mediatek: enable i2c0 for mt8365-evk board

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Message-ID: <26a93f91-7ffb-ef90-5c15-bfb1f979f819@collabora.com>
Date:   Tue, 7 Mar 2023 10:46:52 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Alexandre Mergnat <amergnat@...libre.com>,
        Qii Wang <qii.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-i2c@...r.kernel.org, Fabien Parent <fparent@...libre.com>,
        devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 2/2] arm64: dts: mediatek: enable i2c0 for mt8365-evk
 board

Il 06/03/23 14:47, Alexandre Mergnat ha scritto:
> Enable the I2C0 bus provides communication with:
> - The integrated RT9466 Switching Battery Charger.
> - The integrated MT6691 LP4X buck for VDDQ.
> - The integrated MT6691 LP4X buck for VDD2.
> - The pin header, to plug external I2C devices.
> 
> Signed-off-by: Alexandre Mergnat <amergnat@...libre.com>
> ---
>   arch/arm64/boot/dts/mediatek/mt8365-evk.dts | 19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
> index 4683704ea235..b68aee8f229f 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
> @@ -87,6 +87,15 @@ optee_reserved: optee@...00000 {
>   	};
>   };
>   
> +&i2c0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c0_pins>;
> +	clock-frequency = <100000>;
> +	status = "okay";
> +	#address-cells = <1>;
> +	#size-cells = <0>;

Address and size cells are useless if there's no subnode of i2c0...
besides that, please keep the properties ordered by name.

clock-frequency
pinctrl-0
pinctrl-names
status

> +};
> +
>   &pio {
>   	gpio_keys: gpio-keys-pins {
>   		pins {
> @@ -96,6 +105,16 @@ pins {
>   		};
>   	};
>   
> +	i2c0_pins: i2c0-pins {
> +		pins {
> +			pinmux = <MT8365_PIN_57_SDA0__FUNC_SDA0_0>,
> +				 <MT8365_PIN_58_SCL0__FUNC_SCL0_0>;
> +			mediatek,pull-up-adv = <3>;
> +			mediatek,drive-strength-adv = <00>;

bias-pull-up;
mediatek,d...
mediatek,p....

Also, "00" is the same as "0", being this not a string... so write it as 0.

Thanks,
Angelo