linux-kernel - Re: [PATCH 4/4] arm64: dts: qcom: sc7280-crd: Add Touchscreen and touchpad support

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Date:   Tue, 23 Nov 2021 09:58:26 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, sboyd@...eaurora.org,
        dianders@...omium.org, kgodara@...eaurora.org
Subject: Re: [PATCH 4/4] arm64: dts: qcom: sc7280-crd: Add Touchscreen and
 touchpad support

On Tue, Nov 23, 2021 at 12:30:13PM +0530, Rajendra Nayak wrote:
> From: Kshitiz Godara <kgodara@...eaurora.org>
> 
> Add Touchscreen and touchpad hid-over-i2c node

to which board(s)?

> Signed-off-by: Kshitiz Godara <kgodara@...eaurora.org>
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7280-crd.dts | 63 +++++++++++++++++++++++++++++++++
>  1 file changed, 63 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-crd.dts b/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> index 8c2aee6..bef3037 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> @@ -23,6 +23,47 @@
>  	};
>  };
>  
> +ap_tp_i2c: &i2c0 {
> +	status = "okay";
> +	clock-frequency = <400000>;
> +
> +	trackpad: trackpad@15 {
> +		compatible = "hid-over-i2c";
> +		reg = <0x15>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&tp_int_odl>;
> +
> +		interrupt-parent = <&tlmm>;
> +		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
> +
> +		post-power-on-delay-ms = <20>;
> +		hid-descr-addr = <0x0001>;
> +		vdd-supply = <&vreg_l18b_1p8>;
> +
> +		wakeup-source;
> +	};
> +};
> +
> +ap_ts_pen_1v8: &i2c13 {
> +	status = "okay";
> +	clock-frequency = <400000>;
> +
> +	ap_ts: touchscreen@5c {
> +		compatible = "hid-over-i2c";
> +		reg = <0x5C>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&ts_int_l>, <&ts_reset_l>;
> +
> +		interrupt-parent = <&tlmm>;
> +		interrupts = <55 IRQ_TYPE_LEVEL_LOW>;
> +
> +		post-power-on-delay-ms = <500>;
> +		hid-descr-addr = <0x0000>;
> +
> +		vdd-supply = <&vreg_l19b_1p8>;
> +	};
> +};
> +
>  &nvme_pwren {
>  	pins = "gpio51";
>  };
> @@ -30,3 +71,25 @@
>  &nvme_3v3_regulator {
>  	gpio = <&tlmm 51 GPIO_ACTIVE_HIGH>;
>  };
> +
> +&tlmm {
> +	tp_int_odl: tp-int-odl {
> +		pins = "gpio7";
> +		function = "gpio";
> +		input-enable;

Not sure about this one, is the explicit 'input-enable' actually needed here?

> +		bias-disable;
> +	};
> +
> +	ts_int_l: ts-int-l {
> +		pins = "gpio55";
> +		function = "gpio";
> +		bias-pull-up;
> +	};
> +
> +	ts_reset_l: ts-reset-l {
> +		pins = "gpio54";
> +		function = "gpio";
> +		bias-disable;
> +		drive-strength = <2>;

As per my comment on "[3/4] arm64: dts: qcom: sc7280: Define EC and H1 nodes" it
seems setting the drive strength to 2 isn't necessary, since that's the default.