linux-kernel - Re: [PATCH v4 09/12] arm64: dts: qcom: sdm845-lg-common: Add camera flash

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Message-ID: <863db415-51e0-4c54-85bf-ac6a168758e0@oss.qualcomm.com>
Date: Mon, 1 Dec 2025 12:42:32 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Paul Sajna <sajattack@...tmarketos.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, David Heidelberg <david@...t.cz>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        Amir Dahan <system64fumo@...tonmail.com>,
        Christopher Brown <crispybrown@...il.com>
Subject: Re: [PATCH v4 09/12] arm64: dts: qcom: sdm845-lg-common: Add camera
 flash

On 11/28/25 9:20 PM, Paul Sajna wrote:
> I did more testing on this, and the led only comes on if it's brightness is set to approx 150/255 or lower. In that case, should I set led-max-microamp to 60mA?

FWIW your downstream kernel sets up channels 0 and 1, here you only
enabled 1. Taking a look at a picture of the phone, I only see a single
LED on the back, so perhaps you're (over)driving a single power line?

I'm not a milion percent sure, but I would assume the current draw
*limiting* register applies to the sum of the current going through
the three channels because there's only a single instance of it.

Konrad