linux-kernel - Re: [PATCH] arm64: dts: qcom: hamoa: Add PSCI SYSTEM

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Message-ID: <86444bf0-4672-4f64-89a1-9a830b04a5be@oss.qualcomm.com>
Date: Mon, 9 Feb 2026 09:47:06 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Xin Liu <xin.liu@....qualcomm.com>,
        Bjorn Andersson
 <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        tingwei.zhang@....qualcomm.com, jie.gan@....qualcomm.com
Subject: Re: [PATCH] arm64: dts: qcom: hamoa: Add PSCI SYSTEM_RESET2 types

On 2/9/26 5:27 AM, Xin Liu wrote:
> Add support for SYSTEM_RESET2 vendor-specific resets as
> reboot-modes in the psci node.  Describe the resets: "bootloader"
> will cause device to reboot and stop in the bootloader's fastboot
> mode.  "edl" will cause device to reboot into "emergency download
> mode", which permits loading images via the Firehose protocol.
> 
> Signed-off-by: Xin Liu <xin.liu@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/hamoa.dtsi | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/hamoa.dtsi b/arch/arm64/boot/dts/qcom/hamoa.dtsi
> index db65c392e618..2a490e0a8b5d 100644
> --- a/arch/arm64/boot/dts/qcom/hamoa.dtsi
> +++ b/arch/arm64/boot/dts/qcom/hamoa.dtsi
> @@ -450,6 +450,11 @@ system_pd: power-domain-system {
>  			#power-domain-cells = <0>;
>  			/* TODO: system-wide idle states */
>  		};
> +
> +		reboot-mode {
> +			mode-bootloader = <0x10001 0x2>;
> +			mode-edl = <0 0x1>;
> +		};

Will this work on any hamoa device, or is this dependent upon the
IoT firmware?

Konrad