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

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Date:   Wed, 30 Mar 2022 13:18:08 +0530
From:   Joel Selvaraj <jo@...amily.in>
To:     marijn.suijten@...ainline.org
Cc:     agross@...nel.org, airlied@...ux.ie, amit.pundir@...aro.org,
        bjorn.andersson@...aro.org, daniel@...ll.ch,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        jo@...amily.in, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        robh+dt@...nel.org, sam@...nborg.org, sumit.semwal@...aro.org,
        thierry.reding@...il.com, ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sdm845-xiaomi-beryllium: enable
 qcom wled backlight and link to panel

Hi Marijn,

On 30/03/22 12:47, Marijn Suijten wrote:
 > 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://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Flinux-arm-msm%2F20211115203459.1634079-6-marijn.suijten%40somainline.org%2F&amp;data=04%7C01%7C%7C2104b54ac0f54308dd1208da121d706a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637842214894184949%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=GYmzHoy6tTAE7ZNTqclfCZH5Fnu%2Bh5d5JHOwsm4wVro%3D&amp;reserved=0
 >
 > Sticking with qcom,num-strings is probably the right choice here.

Ok. Thanks. Will fix it in the next version.

Regards
Joel

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