linux-kernel - Re: [PATCH 1/5] arm64: dts: qcom: pmi8998: add rradc node

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Date:   Sun, 16 Oct 2022 21:10:26 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>
Cc:     Luca Weiss <luca@...tu.xyz>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        devicetree@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 1/5] arm64: dts: qcom: pmi8998: add rradc node

On 16/10/2022 14:03, Caleb Connolly wrote:
> Add a DT node for the Round Robin ADC found in the PMI8998 PMIC.
> 
> Signed-off-by: Caleb Connolly <caleb.connolly@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/pmi8998.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/pmi8998.dtsi b/arch/arm64/boot/dts/qcom/pmi8998.dtsi
> index 6d3d212560c1..5a479259c041 100644
> --- a/arch/arm64/boot/dts/qcom/pmi8998.dtsi
> +++ b/arch/arm64/boot/dts/qcom/pmi8998.dtsi
> @@ -18,6 +18,14 @@ pmi8998_gpio: gpios@...0 {
>  			interrupt-controller;
>  			#interrupt-cells = <2>;
>  		};
> +
> +		pmi8998_rradc: adc@...0 {
> +			compatible = "qcom,pmi8998-rradc";
> +			reg = <0x4500>;
> +			#io-channel-cells = <1>;
> +
> +			status = "disabled";

Why disabling it? It does not need any external/board resources, so
maybe it should be just like other adcs - enabled by default? What does
it measure? What is its input?

Best regards,
Krzysztof