linux-kernel - [PATCH v4 0/7] rtc-rv8803: Implement timestamp trigger over event pins

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Message-Id: <20250521090552.3173-1-markus.burri@mt.com>
Date: Wed, 21 May 2025 11:05:45 +0200
From: Markus Burri <markus.burri@...com>
To: linux-kernel@...r.kernel.org
Cc: Markus Burri <markus.burri@...com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Manuel Traut <manuel.traut@...com>,
	Marek Vasut <marex@...x.de>,
	linux-rtc@...r.kernel.org,
	devicetree@...r.kernel.org,
	Markus Burri <markus.burri@....ch>
Subject: [PATCH v4 0/7] rtc-rv8803: Implement timestamp trigger over event pins

The RV8901 RTC chip provides a function to store timestamp events.
There are three input pins (EVIN1-3) available for triggering.
The timestamp can be read to detect tamper alerts, for example.

This patch series extends the sysfs interface to enable and read the 
timestamp events.

The data-sheet can be found here:
https://download.epsondevice.com/td/pdf/brief/RX8901CE_en.pdf


Changes in V4:
* fix warning in dt-binding
* reformat
* fix flags reset on read
* auto enable if configured in device-tree
* rebase to linux-6.15~rc1

Changes in V3:
* change permission for sysfs read to admin
* add device-tree bindings for event pin and buffer mode configuration

Changes in V2:
* remove separate patch for register definitions
* remove pin configuration over sysfs (use default settings)
* add sysfs documentation
* rework enable to simplify and remove big mutext scope
---
[V1] https://lore.kernel.org/lkml/20250110061401.358371-1-markus.burri@mt.com/
[V2] https://lore.kernel.org/lkml/20250116131532.471040-1-markus.burri@mt.com/
[V3] https://lore.kernel.org/lkml/20250513161922.4064-1-markus.burri@mt.com/

Markus Burri (7):
  dt-bindings: rtc: add new type for epson,rx8901
  rtc-rv8803: add new type for rv8901
  rtc-rv8803: add tamper function to sysfs for rv8901
  rtc-rv8803: extend sysfs to trigger internal ts-event
  rtc-rv8803: extend sysfs to read status
  dt-bindings: rtc-rv8803: add tamper detection property node
  rtc-rv8803: make tamper function configurable via dt

 .../ABI/testing/sysfs-class-rtc-tamper        |  36 +
 .../devicetree/bindings/rtc/epson,rx8900.yaml |  39 +-
 drivers/rtc/rtc-rv8803.c                      | 639 +++++++++++++++++-
 3 files changed, 709 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-class-rtc-tamper


base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
-- 
2.39.5