linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7180-trogdor: Disable pwmleds node where unused

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Message-ID: <dd33eae5-4d5d-4210-aac1-69d1c0339911@collabora.com>
Date: Tue, 18 Jun 2024 17:06:18 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 cros-qcom-dts-watchers@...omium.org, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Rob Clark <robdclark@...omium.org>,
 Douglas Anderson <dianders@...omium.org>, Stephen Boyd <swboyd@...omium.org>
Cc: kernel@...labora.com, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc7180-trogdor: Disable pwmleds node
 where unused

Il 14/06/24 22:59, Nícolas F. R. A. Prado ha scritto:
> Currently the keyboard backlight is described in the common
> sc7180-trogdor dtsi as an led node below a pwmleds node, and the led
> node is set to disabled. Only the boards that have a keyboard backlight
> enable it.
> 
> However, since the parent pwmleds node is still enabled everywhere, even
> on boards that don't have keyboard backlight it is probed and fails,
> resulting in an error:
> 
>    leds_pwm pwmleds: probe with driver leds_pwm failed with error -22
> 
> as well as a failure in the DT kselftest:
> 
>    not ok 45 /pwmleds
> 
> Fix this by controlling the status of the parent pwmleds node instead of
> the child led, based on the presence of keyboard backlight. This is what
> is done on sc7280 already.
> 
> While at it add a missing blank line before the child node to follow the
> coding style.
> 
> Fixes: 7ec3e67307f8 ("arm64: dts: qcom: sc7180-trogdor: add initial trogdor and lazor dt")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>