[PATCH v2 0/4] power: reset: add NVMEM recorder provider for PSCRR

[Faruque Ansari]

The PSCRR framework[1] currently does not provide a recorder provider
capable of persisting power state change reasons across power cycles.

This series extends the PSCRR framework[1] with support for an
NVMEM-cell recorder provider, integrating PSCRR-recorded power state
change reasons with the NVMEM subsystem.

The recorder writes the power state change reason into a small NVMEM cell
(e.g. a PMIC SDAM byte or RTC scratch register) before shutdown or reset,
so the cause survives a power cycle and is available via
/sys/kernel/pscrr/ on the next boot.

Only the NVMEM-cell provider is included here. The PMIC hardware-register
provider will be submitted as a separate series.

Change in v2:
	- Add reviewers to To/Cc list.
	- Update patch 1/4:
	   * Rename DT node from pscr-reason to reboot-reason.
	   * Update DT binding example to use fixed-layout NVMEM layout.
	   * Add reboot_reason_persist NVMEM cell under fixed-layout.
	   * Update Qualcomm DTS example accordingly.
	- update patch 2/4 based on Uwe Kleine-König feedback:
	   * Remove unnecessary #include <linux/mod_devicetable.h>
	-v1-link: [2]

[1] https://lore.kernel.org/lkml/20260731095959.296056-1-o.rempel@xxxxxxxxxxxxxx/
[2] https://lore.kernel.org/all/20260817-pscrr-provider-v1-0-88a318c13d41@xxxxxxxxxxxxxxxx/

Signed-off-by: Faruque Ansari <faruque.ansari@xxxxxxxxxxxxxxxx>
---
Faruque Ansari (4):
      dt-bindings: power: reset: add PSCRR NVMEM recorder binding
      power: reset: add PSCRR NVMEM recorder
      nvmem: provide consumer access to cell size metrics
      arm64: dts: qcom: lemans: Add PSCRR NVMEM recorder node

 .../bindings/power/reset/pscrr-nvmem.yaml          |  59 ++++++++
 MAINTAINERS                                        |   1 +
 arch/arm64/boot/dts/qcom/lemans-pmics.dtsi         |  16 +++
 drivers/nvmem/core.c                               |  29 ++++
 drivers/power/reset/pscrr/Kconfig                  |  14 ++
 drivers/power/reset/pscrr/Makefile                 |   1 +
 drivers/power/reset/pscrr/pscrr-nvmem.c            | 154 +++++++++++++++++++++
 include/linux/nvmem-consumer.h                     |   7 +
 8 files changed, 281 insertions(+)
---
base-commit: be461b2185ea3ff6d9c92deedcee0a62a57e1332
change-id: 20260806-pscrr-provider-b9f8f451701e

Best regards,
--  
Faruque Ansari <faruque.ansari@xxxxxxxxxxxxxxxx>