linux-kernel - Re: [PATCH 2/3] arm64: dts: qcom: x1e80100-crd: switch WSA8845 speakers to shared reset-gpio

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Date: Sat, 2 Mar 2024 01:02:08 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] arm64: dts: qcom: x1e80100-crd: switch WSA8845
 speakers to shared reset-gpio

On 27.02.2024 15:27, Krzysztof Kozlowski wrote:
> Each pair of WSA8845 speakers share the powerdown SD_N GPIO, thus this
> GPIO is specified twice in each WSA8845 device node.  Such DTS was added
> hoping non-exclusive GPIO usage would be accepted, but it turned out
> otherwise: it is not supported by the Linux kernel.
> 
> Linux kernel however supports sharing reset GPIOs, when used bia the
> reset controller framework as implemented in commit 26c8a435fce6 ("ASoC:
> dt-bindings: qcom,wsa8840: Add reset-gpios for shared line") and
> commit c721f189e89c ("reset: Instantiate reset GPIO controller for
> shared reset-gpios").
> 
> Convert the property with shutdown GPIO to "reset-gpios" to use
> mentioned Linux kernel feature.  This allows to bring all four speakers
> out of reset.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad