linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: sdm845-xiaomi-beryllium: enable qcom wled backlight and link to panel

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Message-ID: <20220330071759.ftcs2fhr7ehrfsqs@SoMainline.org>
Date:   Wed, 30 Mar 2022 09:17:59 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Joel Selvaraj <jo@...amily.in>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Amit Pundir <amit.pundir@...aro.org>
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sdm845-xiaomi-beryllium: enable
 qcom wled backlight and link to panel

On 2022-03-30 12:26:39, Joel Selvaraj wrote:
> Xiaomi Poco F1 uses the QCOM WLED driver for backlight control.
> Enable and link it to the panel to use it.
> 
> Signed-off-by: Joel Selvaraj <jo@...amily.in>
> ---
>  .../arm64/boot/dts/qcom/sdm845-xiaomi-beryllium.dts | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium.dts b/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium.dts
> index 798fc72578a7..3ebb0f9905d3 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium.dts
> @@ -231,6 +231,7 @@ panel@0 {
>  		#address-cells = <1>;
>  		#size-cells = <0>;
>  
> +		backlight = <&pmi8998_wled>;
>  		reset-gpios = <&tlmm 6 GPIO_ACTIVE_LOW>;
>  
>  		port {
> @@ -314,6 +315,18 @@ vol_up_pin_a: vol-up-active {
>  	};
>  };
>  
> +&pmi8998_wled {
> +	status = "okay";
> +	qcom,current-boost-limit = <970>;
> +	qcom,ovp-millivolt = <29600>;
> +	qcom,current-limit-microamp = <20000>;
> +	qcom,enabled-strings = <0 1>;
> +	qcom,num-strings = <2>;

No need to set both nowadays, the driver will even print a warning in
this case:

    https://lore.kernel.org/linux-arm-msm/20211115203459.1634079-6-marijn.suijten@somainline.org/

Sticking with qcom,num-strings is probably the right choice here.

- Marijn

> +	qcom,switching-freq = <600>;
> +	qcom,external-pfet;
> +	qcom,cabc;
> +};
> +
>  &pm8998_pon {
>  	resin {
>  		compatible = "qcom,pm8941-resin";
> -- 
> 2.35.1
>