linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm8450-hdk: align WCD9385 reset pin with downstream config

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Date:   Wed, 8 Mar 2023 21:58:42 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8450-hdk: align WCD9385 reset pin
 with downstream config



On 8.03.2023 19:33, Krzysztof Kozlowski wrote:
> Downstream DTS uses 16 mA drive strength for the WCD9385 audio codec
> RESET_N reset pin.  It also pulls the pin down in shutdown mode, thus it
> is more like a shutdown pin, not a reset.  Use the same settings here
> for HDK8450 and keep the WCD9385 by default in powered off (so pin as
> low).  Align the name of pin configuration node with other pins in the
> DTS.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>  arch/arm64/boot/dts/qcom/sm8450-hdk.dts | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8450-hdk.dts b/arch/arm64/boot/dts/qcom/sm8450-hdk.dts
> index 9cd1d1bd86cb..4020e54e16f5 100644
> --- a/arch/arm64/boot/dts/qcom/sm8450-hdk.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8450-hdk.dts
> @@ -767,9 +767,11 @@ spkr_2_sd_n_active: spkr-2-sd-n-active-state {
>  		output-low;
>  	};
>  
> -	wcd_default: wcd-default-state {
> +	wcd_default: wcd-reset-n-active-state {
>  		pins = "gpio43";
>  		function = "gpio";
> +		drive-strength = <16>;
>  		bias-disable;
> +		output-low;
>  	};
>  };