linux-kernel - [PATCH v4 6/7] dt-bindings: rtc-rv8803: add tamper detection property node

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Message-Id: <20250521090552.3173-7-markus.burri@mt.com>
Date: Wed, 21 May 2025 11:05:51 +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 6/7] dt-bindings: rtc-rv8803: add tamper detection property node

The RV8901 RTC chip provides a function to store timestamp events.
There are three input pins (EVIN1-3) available for triggering.
The input pins can be configured and adapted according to the connected
hardware.
Add document of tamper detection properties for epson,rx8901 rtc chip.

Signed-off-by: Markus Burri <markus.burri@...com>
---
 .../devicetree/bindings/rtc/epson,rx8900.yaml | 37 +++++++++++++++++--
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml b/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml
index 03af81754482..2682cbb9097d 100644
--- a/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml
+++ b/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml
@@ -9,9 +9,6 @@ title: EPSON RX8900 / Microcrystal RV8803 Real-Time Clock
 maintainers:
   - Marek Vasut <marex@...x.de>
 
-allOf:
-  - $ref: rtc.yaml#
-
 properties:
   compatible:
     enum:
@@ -33,6 +30,40 @@ properties:
 
   wakeup-source: true
 
+  tamper:
+    description: Subnode for tamper configuration.
+      This subnode is only available for epson,rx8901.
+    type: object
+    additionalProperties: false
+
+    properties:
+      buffer-overwrite:
+        type: boolean
+        description: Set the buffer mode to overwrite. Default is inhibit.
+
+    patternProperties:
+      "^evin-[0-3]$":
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        minItems: 3
+        maxItems: 3
+        description: External event input pin configuration.
+          The configuration is an array of tree values and contains
+          "pull-resistor", "trigger" and "filter".
+          For a detailed description, see epson-rx8901 datasheet.
+
+allOf:
+  - $ref: rtc.yaml#
+  - if:
+      properties:
+        compatible:
+          not:
+            contains:
+              enum:
+                - epson,rx8901
+    then:
+      properties:
+        tamper: false
+
 required:
   - compatible
   - reg
-- 
2.39.5