Re: [PATCH v16 5/6] power: reset: Introduce PSCR Recording Framework for Non-Volatile Storage

[Daniel Lezcano <daniel.lezcano@oss.qualcomm.com>]

On 10/7/26 09:06, Faruque Ansari wrote:
> Introduce the Power State Change Reasons Recording (PSCRR) framework: a
> generic mechanism to record why the last power state change (shutdown or
> reboot) happened - under-voltage, thermal, watchdog, software-triggered,
> etc. - so a postmortem reason survives a reboot or an abrupt power loss.
> 
> PSCRR is built around providers. A provider is either a hardware reason
> source (a PMIC, SoC reset controller or watchdog exposing a reset cause)
> or a recorder that persists the reason across a power cycle (an NVMEM or
> RTC scratch cell). Each provider gets a directory under
> /sys/kernel/pscrr/providerN/ exposing its name, backing device, the set
> of observed reasons (as tokens), its capabilities, the reasons it
> supports and - for recorders - a record policy. The reason set is
> deliberately not collapsed to a single winning cause, since resets are
> often multi-causal.
> 
> Reasons are the numeric enum psc_reason values from reboot.h, shared with
> the POWER_ON_REASON_* vocabulary, so they store compactly in small
> battery-backed cells. The current reason (get/set_psc_reason(), set by
> the thermal/regulator/hw_protection paths) is written to every recorder
> from the reboot notifier.
> 
> Co-developed-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> Reported-by: Francesco Valla <francesco@valla.it>
> Closes: https://lore.kernel.org/all/178749889134.204450.5740187753642158305.b4-review@b4/
> Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
> Signed-off-by: Faruque Ansari <faruque.ansari@oss.qualcomm.com>
> 
Reviewed-by: Daniel Lezcano <daniel.lezcano@oss.qualcomm.com>