linux-kernel - Re: [PATCH v1 1/1] arm64: dts: qcom: talos-evk: Add support for dual-channel LVDS panel

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Message-ID: <9208d2ef-79da-4e80-ac1f-e01fa5feae0a@gmail.com>
Date: Wed, 29 Oct 2025 17:50:01 +0530
From: Tessolve Upstream <tessolveupstream@...il.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>, andersson@...nel.org,
 konradybcio@...nel.org
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] arm64: dts: qcom: talos-evk: Add support for
 dual-channel LVDS panel



On 28/10/25 14:55, Konrad Dybcio wrote:
> On 10/28/25 7:16 AM, Sudarshan Shetty wrote:
>> This patch introduces a new device tree for the QCS615 Talos
>> EVK platform with dual-channel LVDS display support.
>>
>> The new DTS file (`talos-evk-lvds.dts`) is based on the existing
>> `talos-evk.dts` and extends it to enable a dual-channel LVDS display
>> configuration using the TI SN65DSI84 DSI-to-LVDS bridge.
>>
>> where channel-A carries odd pixel and channel-B carries even pixel
>> on the QCS615 talos evk platform.
>>
>> Signed-off-by: Sudarshan Shetty <tessolveupstream@...il.com>
>> ---
> 
> [...]
> 
>> +	backlight: backlight {
>> +		compatible = "gpio-backlight";
>> +		gpios = <&tlmm 115 GPIO_ACTIVE_HIGH>;
>> +		default-on;
>> +	};
>> +
>> +	lcd0_pwm_en {
> 
> Use hyphens instead of underscores in node names

Okay, will update in next patch.
> 
>> +		compatible = "pwm-gpio";
>> +		gpios = <&tlmm 59 GPIO_ACTIVE_HIGH>;
>> +		pinctrl-0 = <&lcd0_bklt_pwm>;
> 
> I think your intention was to use pwm-backlight and wire this node
> up to that

Soc does not support the PWM interface hence we are using gpio 
as "pwm-gpio" by setting the duty cycle to 100%(i.e. "no pwm")
> 
> Konrad