linux-kernel - Re: [PATCH RFC v2 2/6] arm64: dts: qcom: sdm845-tama: Add Synaptics Touchscreen

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Message-ID: <a131ffa0-1e9c-d355-16db-19e679ab0380@linaro.org>
Date:   Mon, 13 Mar 2023 18:01:13 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH RFC v2 2/6] arm64: dts: qcom: sdm845-tama: Add Synaptics
 Touchscreen



On 13.03.2023 17:32, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@...ainline.org>
> 
> Add required pins and RMI4 node to the common DT and remove it
> from Akatsuki, as it uses a different touch.
> 
> Since the panels are super high tech proprietary incell, they
> need to be handled with very precise timings. As such the panel
> driver sets up the power rails and GPIOs and the touchscreen
> driver *has to* probe afterwards.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
[...]

>  &i2c5 {
> -	status = "okay";
>  	clock-frequency = <400000>;
> +	status = "okay";
> +
> +	touchscreen: touchscreen@2c {
> +		compatible = "syna,rmi4-i2c";
> +		reg = <0x2c>;
> +
> +		interrupt-parent = <&tlmm>;
> +		interrupts = <125 IRQ_TYPE_EDGE_FALLING>;
interrupts-extended

> +		vdd-supply = <&vreg_l14a_1p8>;
> +		/*
> +		 * This is a blatant abuse of OF, but the panel driver *needs*
> +		 * to probe first, as the power/gpio switching needs to be precisely
> +		 * timed in order for both the display and touch panel to function properly.
> +		 */
> +		incell-supply = <&panel>;
> +
> +		syna,reset-delay-ms = <220>;
> +		syna,startup-delay-ms = <1000>;
> +
> +		pinctrl-names = "default", "sleep";
> +		pinctrl-0 = <&ts_default>;
> +		pinctrl-1 = <&ts_sleep>;
swapped

>  
> -	/* Synaptics touchscreen @ 2c, 3c */
> +		#address-cells = <1>;
> +		#size-cells = <0>;
Konrad