Re: [PATCH v20 00/10] Implement PSCI reboot mode driver for PSCI resets

[Pankaj Patil]

On 3/4/2026 11:33 PM, Shivendra Pratap wrote:
> Userspace should be able to initiate device reboots using the various
> PSCI SYSTEM_RESET and SYSTEM_RESET2 types defined by PSCI spec. This
> patch series introduces psci-reboot-mode driver that registers with
> reboot-mode framework to provide this functionality.
> 
> The PSCI system reset calls takes two arguments: reset_type and cookie.
> It defines predefined reset types, such as warm and cold reset, and
> vendor-specific reset types which are SoC vendor specific. To support
> these requirements, the reboot-mode framework is enhanced in two key
> ways:
> 1. 64-bit magic support: Extend reboot-mode to handle two 32-bit
> arguments (reset_type and cookie) by encoding them into a single 64-bit
> magic value.
> 2. Predefined modes: Add support for predefined reboot modes in the
> framework.
> 
> With these enhancements, the patch series enables:
>  - Warm reset and cold reset as predefined reboot modes.
>  - Vendor-specific resets exposed as tunables, configurable via the
>    SoC-specific device tree.
> 
> Together, these changes allow userspace to trigger all above PSCI resets
> from userspace.
> 
> Currently three drivers register with reboot-mode framework -
> syscon-reboot-mode, nvmem-reboot-mode and qcom-pon. Consolidated
> list of commands currently added across various vendor DTs:
>  mode-loader
>  mode-normal
>  mode-bootloader
>  mode-charge
>  mode-fastboot
>  mode-reboot-ab-update
>  mode-recovery
>  mode-rescue
>  mode-shutdown-thermal
>  mode-shutdown-thermal-battery
> 
> On gs101 we also pass kernel-generated modes from kernel_restart()
> or panic(), specifically DM verity's 'dm-verity device corrupted':
> 	mode-dm-verity-device-corrupted = <0x50>;
> 
> - thanks Andre' for providing this.
> 
> Detailed list of commands being used by syscon-reboot-mode:
>     arm64/boot/dts/exynos/exynosautov9.dtsi:
> 	mode-bootloader = <EXYNOSAUTOV9_BOOT_BOOTLOADER>;
> 	mode-fastboot = <EXYNOSAUTOV9_BOOT_FASTBOOT>;
> 	mode-recovery = <EXYNOSAUTOV9_BOOT_RECOVERY>;
> 
>     arm64/boot/dts/exynos/google/gs101.dtsi:
>     	mode-bootloader = <0xfc>;
>     	mode-charge = <0x0a>;
>     	mode-fastboot = <0xfa>;
>     	mode-reboot-ab-update = <0x52>;
>     	mode-recovery = <0xff>;
>     	mode-rescue = <0xf9>;
>     	mode-shutdown-thermal = <0x51>;
>     	mode-shutdown-thermal-battery = <0x51>;
> 
>     arm64/boot/dts/hisilicon/hi3660-hikey960.dts:
>     	mode-normal = <0x77665501>;
>     	mode-bootloader = <0x77665500>;
>     	mode-recovery = <0x77665502>;
> 
>     arm64/boot/dts/hisilicon/hi6220-hikey.dts:
>     	mode-normal = <0x77665501>;
>     	mode-bootloader = <0x77665500>;
>     	mode-recovery = <0x77665502>;
> 
>     arm64/boot/dts/rockchip/px30.dtsi:
>     	mode-bootloader = <BOOT_BL_DOWNLOAD>;
>     	mode-fastboot = <BOOT_FASTBOOT>;
>     	mode-loader = <BOOT_BL_DOWNLOAD>;
>     	mode-normal = <BOOT_NORMAL>;
>     	mode-recovery = <BOOT_RECOVERY>;
> 
>     arm64/boot/dts/rockchip/rk3308.dtsi:
>     	mode-bootloader = <BOOT_BL_DOWNLOAD>;
>     	mode-loader = <BOOT_BL_DOWNLOAD>;
>     	mode-normal = <BOOT_NORMAL>;
>     	mode-recovery = <BOOT_RECOVERY>;
>     	mode-fastboot = <BOOT_FASTBOOT>;
> 
>     arm64/boot/dts/rockchip/rk3566-lckfb-tspi.dts:
>     	mode-normal = <BOOT_NORMAL>;
>     	mode-loader = <BOOT_BL_DOWNLOAD>;
> 			mode-recovery = <BOOT_RECOVERY>;
> 			mode-bootloader = <BOOT_FASTBOOT>;
> 
> Detailed list of commands being used by nvmem-reboot-mode:
>     arm64/boot/dts/qcom/pmXXXX.dtsi:(multiple qcom DTs)
> 			mode-recovery = <0x01>;
> 			mode-bootloader = <0x02>;
> 
> The patch is tested on rb3Gen2, lemans-ride, lemans-evk, monaco-ride,
> qcs615-ride.
> 
> @Florian/@Kathiravan, Please note that reset_type in DT needs to be
> full in itself with 31st bit set. (eg: 0x80000000).
> 
> PS: As advised from Lorenzo, "PSCI maintainers should be added as
> maintainers for psci-reboot-mode".
> 
> Previous discussions around SYSTEM_RESET2:
> - https://lore.kernel.org/lkml/20230724223057.1208122-2-quic_eberman@xxxxxxxxxxx/T/
> - https://lore.kernel.org/all/4a679542-b48d-7e11-f33a-63535a5c68cb@xxxxxxxxxxx/
> 
> Signed-off-by: Shivendra Pratap <shivendra.pratap@xxxxxxxxxxxxxxxx>
> 

Tested-by: Pankaj Patil <pankaj.patil@xxxxxxxxxxxxxxxx>