linux-kernel - [PATCH 0/2] support Linux reboot modes in syscon-reboot

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Message-Id: <20250226-syscon-reboot-reset-mode-v1-0-91c1b62166ae@linaro.org>
Date: Wed, 26 Feb 2025 14:08:19 +0000
From: André Draszik <andre.draszik@...aro.org>
To: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Peter Griffin <peter.griffin@...aro.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
 linux-pm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 André Draszik <andre.draszik@...aro.org>
Subject: [PATCH 0/2] support Linux reboot modes in syscon-reboot

This series teaches syscon-reboot some of Linux' different reboot
modes.

Linux supports a couple different reboot modes, but syscon-reboot
doesn't distinguish between them and issues the same syscon register
write irrespective of the reboot mode requested by the kernel.

This is a problem when platforms want to do a cold reboot most of the
time, which could e.g. wipe RAM etc, but also want to support rebooting
while keeping RAM contents in certain cases.

DTs can now specify the existing properties prefixed with one of the
Linux reboot modes. All the changes to support this are optional and
opt-in, platforms that don't, or don't specify a register/value/mask
pair for a specific mode will behave just as before.

Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
André Draszik (2):
      dt-bindings: reset: syscon-reboot: support reset modes
      power: reset: syscon-reboot: support different reset modes

 .../bindings/power/reset/syscon-reboot.yaml        | 74 ++++++++++++++++++
 drivers/power/reset/syscon-reboot.c                | 88 +++++++++++++++++++---
 2 files changed, 151 insertions(+), 11 deletions(-)
---
base-commit: 0226d0ce98a477937ed295fb7df4cc30b46fc304
change-id: 20250226-syscon-reboot-reset-mode-566588b847e1

Best regards,
-- 
André Draszik <andre.draszik@...aro.org>