linux-kernel - Re: [PATCH 11/11] arm64: dts: mediatek: cherry: Add I2C-HID touchscreen on I2C4

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Date:   Fri, 1 Jul 2022 18:49:39 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, hsinyi@...omium.org,
        allen-kh.cheng@...iatek.com, gtk3@...ox.ru, luca@...tu.xyz,
        sam.shih@...iatek.com, sean.wang@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org
Subject: Re: [PATCH 11/11] arm64: dts: mediatek: cherry: Add I2C-HID
 touchscreen on I2C4

On Thu, Jun 30, 2022 at 05:33:16PM +0200, AngeloGioacchino Del Regno wrote:
> This platform carries a HID compatible I2C touchscreen on the i2c4 bus,
> but it may either be at 0x10, or at 0x15, depending on the board model:
> declare both as disabled in the common Cherry device-tree and enable
> the required touchscreen node on a per-board basis.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  .../dts/mediatek/mt8195-cherry-tomato-r1.dts  |  4 ++
>  .../dts/mediatek/mt8195-cherry-tomato-r2.dts  |  4 ++
>  .../dts/mediatek/mt8195-cherry-tomato-r3.dts  |  4 ++
>  .../boot/dts/mediatek/mt8195-cherry.dtsi      | 41 +++++++++++++++++++
>  4 files changed, 53 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
> index 17e9e4d6f6ab..2837fb24c84c 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
> @@ -9,3 +9,7 @@ / {
>  	model = "MediaTek Tomato (rev1) board";
>  	compatible = "google,tomato-rev1", "google,tomato", "mediatek,mt8195";
>  };
> +
> +&ts_10 {
> +	status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
> index ee5fd07ad573..4e1d1a1887c7 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
> @@ -29,3 +29,7 @@ pins-low-power-pcie0-disable {
>  		bias-pull-down;
>  	};
>  };
> +
> +&ts_10 {
> +	status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
> index 792f6c83e88b..4a45884203ea 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
> @@ -30,3 +30,7 @@ pins-low-power-pcie0-disable {
>  		bias-pull-down;
>  	};
>  };
> +
> +&ts_10 {
> +	status = "okay";
> +};

But no board currently uses the one on 0x15?

Thanks,
Nícolas

> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> index 2687c6d40ac1..7a32c7006a5a 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
> @@ -143,6 +143,31 @@ &i2c4 {
>  	clock-frequency = <400000>;
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&i2c4_pin>;
> +
> +	/* Depending on the machine, the TS may be at 0x10 or at 0x15 */
> +	ts_10: touchscreen@10 {
> +		compatible = "hid-over-i2c";
> +		reg = <0x10>;
> +		hid-descr-addr = <0x0001>;
> +		interrupts-extended = <&pio 92 IRQ_TYPE_LEVEL_LOW>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&touchscreen_pins>;
> +		post-power-on-delay-ms = <10>;
> +		vdd-supply = <&pp3300_s3>;
> +		status = "disabled";
> +	};
> +
> +	ts_15: touchscreen@15 {
> +		compatible = "hid-over-i2c";
> +		reg = <0x15>;
> +		hid-descr-addr = <0x0001>;
> +		interrupts-extended = <&pio 92 IRQ_TYPE_LEVEL_LOW>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&touchscreen_pins>;
> +		post-power-on-delay-ms = <10>;
> +		vdd-supply = <&pp3300_s3>;
> +		status = "disabled";
> +	};
>  };
>  
>  &i2c5 {
> @@ -609,6 +634,22 @@ subpmic_pin_irq: pins-subpmic-int-n {
>  			bias-pull-up;
>  		};
>  	};
> +
> +	touchscreen_pins: touchscreen-default-pins {
> +		pins-int-n {
> +			pinmux = <PINMUX_GPIO92__FUNC_GPIO92>;
> +			input-enable;
> +			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
> +		};
> +		pins-rst {
> +			pinmux = <PINMUX_GPIO56__FUNC_GPIO56>;
> +			output-high;
> +		};
> +		pins-report-sw {
> +			pinmux = <PINMUX_GPIO57__FUNC_GPIO57>;
> +			output-low;
> +		};
> +	};
>  };
>  
>  &pmic {
> -- 
> 2.35.1
>