From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: ferreira@se-rg.io, Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Abel Vesa <abelvesa@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Georg Gottleuber <ggo@tuxedocomputers.com>,
Ettore Chimenti <ek5.chimenti@gmail.com>,
Jens Glathe <jens.glathe@oldschoolsolutions.biz>,
Srinivas Kandagatla <srini@kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: x1e80100-medion-sprchrgd-14-s1: Add PWM backlight
Date: Tue, 13 Oct 2026 12:14:21 +0200 [thread overview]
Message-ID: <a936a22a-0abe-48df-86f6-a67fbc20b465@oss.qualcomm.com> (raw)
In-Reply-To: <20261003-medion-sprchrgd-14-backlight-v1-1-e47da56acfa2@se-rg.io>
On 10/3/26 2:00 PM, Sérgio Ferreira via B4 Relay wrote:
> From: Sérgio Ferreira <ferreira@se-rg.io>
>
> The eDP panel (CSOT MNE007ZA3-2, IPS LCD) cannot have its brightness
> set over eDP AUX. With no backlight phandle on the panel, panel-edp
> falls back to the DP AUX backlight, which registers dp_aux_backlight
> with a maximum brightness of 0, so brightness control has no effect.
[...]
> + backlight: backlight {
> + compatible = "pwm-backlight";
> + pwms = <&pm8550_pwm 3 500000>;
> + enable-gpios = <&pmc8380_3_gpios 4 GPIO_ACTIVE_HIGH>;
> +
> + pinctrl-0 = <&edp_bl_pwm>;
Let's also add a pin state config for the enable GPIO (read back from
firmware is fine - I assume it'll be func=normal/power-source=1/
input-disable/output-enable)
Konrad
prev parent reply other threads:[~2026-10-13 10:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-03 12:00 Sérgio Ferreira via B4 Relay
2026-10-13 10:14 ` Konrad Dybcio [this message]
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