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

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Date:   Wed, 24 Nov 2021 17:19:05 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Matthias Kaehlcke <mka@...omium.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 11/23/2021 11:28 PM, Matthias Kaehlcke wrote:
> 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)?

will update

> 
>> 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?

Maybe not, will test it once after I remove it

> 
>> +		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.

right I'll remove it, thanks

> 

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