Re: [PATCH v15 03/14] power: reset: reboot-mode: Add support for 64 bit magic

[Umang Chheda <umang.chheda@oss.qualcomm.com>]

On 9/22/2025 7:10 PM, Shivendra Pratap wrote:
> Current reboot-mode supports a single 32-bit argument for any
> supported mode. Some reboot-mode based drivers may require
> passing two independent 32-bit arguments during a reboot
> sequence, for uses-cases, where a mode requires an additional
> argument. Such drivers may not be able to use the reboot-mode
> driver. For example, ARM PSCI vendor-specific resets, need two
> arguments for its operation – reset_type and cookie, to complete
> the reset operation. If a driver wants to implement this
> firmware-based reset, it cannot use reboot-mode framework.
> 
> Introduce 64-bit magic values in reboot-mode driver to
> accommodate dual 32-bit arguments when specified via device tree.
> In cases, where no second argument is passed from device tree,
> keep the upper 32-bit of magic un-changed(0) to maintain backward
> compatibility.
> 
> Update the current drivers using reboot-mode for a 64-bit magic
> value.
> 
> Signed-off-by: Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>
> ---
>  drivers/power/reset/nvmem-reboot-mode.c  | 13 +++++++++----
>  drivers/power/reset/qcom-pon.c           | 11 ++++++++---
>  drivers/power/reset/reboot-mode.c        | 19 +++++++++++++------
>  drivers/power/reset/syscon-reboot-mode.c | 11 ++++++++---
>  include/linux/reboot-mode.h              |  3 ++-
>  5 files changed, 40 insertions(+), 17 deletions(-)
> 

Reviewed-by: Umang Chheda <umang.chheda@oss.qualcomm.com>

Thanks,
Umang