linux-kernel - Re: [PATCH] arm64: dts: qcom: x1e001de-devkit: Add Wi-Fi and Bluetooth pwrseq

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Message-ID: <Z-KuG0aOwEnxuhp9@linaro.org>
Date: Tue, 25 Mar 2025 14:22:45 +0100
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Johan Hovold <johan@...nel.org>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: x1e001de-devkit: Add Wi-Fi and
 Bluetooth pwrseq

On Mon, Mar 24, 2025 at 04:24:01PM +0200, Abel Vesa wrote:
> The Qualcomm X Elite Devkit comes with a WCN7850 combo chip which provides
> Wi-fi and Bluetooth, similar to the CRD and QCP.
> 
> Describe the nodes for the Wi-Fi, Bluetooth, the related regulators and
> the PMU.
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/x1e001de-devkit.dts | 144 +++++++++++++++++++++++++++
>  1 file changed, 144 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e001de-devkit.dts b/arch/arm64/boot/dts/qcom/x1e001de-devkit.dts
> index 74911861a3bf2606add8cf4aaa3816542e837513..8f288a138c4cb6e21725fdf726eb2a2489bfbc38 100644
> --- a/arch/arm64/boot/dts/qcom/x1e001de-devkit.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e001de-devkit.dts
> @@ -17,6 +17,7 @@ / {
>  
>  	aliases {
>  		serial0 = &uart21;
> +		serial1 = &uart14;
>  	};
>  
>  	wcd938x: audio-codec {
> @@ -392,6 +393,42 @@ vph_pwr: regulator-vph-pwr {
>  		regulator-boot-on;
>  	};
>  
> +	vreg_wcn_0p95: regulator-wcn-0p95 {
> +		compatible = "regulator-fixed";
> +
> +		regulator-name = "VREG_WCN_0P95";
> +		regulator-min-microvolt = <950000>;
> +		regulator-max-microvolt = <950000>;
> +
> +		vin-supply = <&vreg_wcn_3p3>;
> +	};
> +
> +	vreg_wcn_1p9: regulator-wcn-1p9 {
> +		compatible = "regulator-fixed";
> +
> +		regulator-name = "VREG_WCN_1P9";
> +		regulator-min-microvolt = <1900000>;
> +		regulator-max-microvolt = <1900000>;
> +
> +		vin-supply = <&vreg_wcn_3p3>;
> +	};

Hm, on CRD and T14s there is a TODO comment above these two, which is
also why I haven't posted these upstream yet:

We still haven't come to a conclusion unfortunately how to model the M.2
WiFi/BT cards. QCP doesn't have M.2, which is why it is upstream
already. These two regulators don't actually exist on the devkit itself,
they are (probably) part of the M.2 card.

The devkit only provides the 3.3V and 1.8V supply to the M.2 card.

We should really find some way forward for this, but just omitting any
mention of this is not the best way. :-)

Thanks,
Stephan