Re: [PATCH 5/6] riscv: dts: spacemit: k1-orangepi-r2s: fix maximum CPU core voltage

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:

Pre-existing issues:
- [High] The CPU core voltage limit in the Banana Pi CM6 devicetree remains at a dangerously high 3.45V, risking permanent hardware damage.
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--- Patch [5]: [PATCH 5/6] riscv: dts: spacemit: k1-orangepi-r2s: fix maximum CPU core voltage ---
commit e89342d2210b8ee4353584159b6747437181135a
Author: Aurelien Jarno <aurelien@aurel32.net>
Subject: riscv: dts: spacemit: k1-orangepi-r2s: fix maximum CPU core voltage

This commit lowers the maximum output voltage of the buck1 and buck2
regulators on the OrangePi R2S board from 3.45V to 1.050V. This prevents
potential permanent CPU damage from misconfigurations or privileged userspace
requests.

Link: https://sashiko.dev/#/message/20260728211020.1248676-2-aurelien%40aurel32.net

> diff --git a/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts b/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts
> index 24591f7c3d236..2d1ba34cb00e2 100644
> --- a/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts
> +++ b/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts
[ ... ]
>  			buck2 {
>  				regulator-min-microvolt = <500000>;
> -				regulator-max-microvolt = <3450000>;
> +				regulator-max-microvolt = <1050000>;
>  				regulator-ramp-delay = <5000>;
>  				regulator-always-on;
>  			};

[Severity: High]
This is a pre-existing issue, but I noticed the Banana Pi CM6 devicetree
appears to retain the same 3.45V maximum voltage limit for its CPU core 
regulators.

Should arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi also be updated
to prevent similar hardware damage risks?

arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi:
			buck1 {
				regulator-min-microvolt = <500000>;
				regulator-max-microvolt = <3450000>;
				regulator-ramp-delay = <5000>;
				regulator-always-on;
			};

			buck2 {
				regulator-min-microvolt = <500000>;
				regulator-max-microvolt = <3450000>;

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260729150722.1598630-1-aurelien@aurel32.net?part=5