linux-kernel - [PATCH 1/2] dt-bindings: counter: Add binding for NXP PCF85263/PCF85363 stopwatch

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Message-Id: <20250915071415.1956219-1-lakshay.piplani@nxp.com>
Date: Mon, 15 Sep 2025 12:44:14 +0530
From: Lakshay Piplani <lakshay.piplani@....com>
To: wbg@...nel.org,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org
Cc: vikash.bansal@....com,
	priyanka.jain@....com,
	shashank.rebbapragada@....com,
	Lakshay Piplani <lakshay.piplani@....com>
Subject: [PATCH 1/2] dt-bindings: counter: Add binding for NXP PCF85263/PCF85363 stopwatch

Add a devicetree binding schema for the NXP PCF8263/PCF85363 devices when used in
stopwatch (counter) mode.

In this configuration, the device operates as a high resolution stopwatch over I2C,
counting in centiseconds (1/100th of a second) up to 999,999 hours.

Signed-off-by: Lakshay Piplani <lakshay.piplani@....com>
---
 .../counter/nxp,pcf85363-stopwatch.yaml       | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/counter/nxp,pcf85363-stopwatch.yaml

diff --git a/Documentation/devicetree/bindings/counter/nxp,pcf85363-stopwatch.yaml b/Documentation/devicetree/bindings/counter/nxp,pcf85363-stopwatch.yaml
new file mode 100644
index 000000000000..5fbb3f22ace4
--- /dev/null
+++ b/Documentation/devicetree/bindings/counter/nxp,pcf85363-stopwatch.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/counter/nxp,pcf85363-stopwatch.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP PCF85263ATL/PCF85363ATL Stopwatch (counter) mode
+
+maintainers:
+  - Lakshay Piplani <lakshay.piplani@....com>
+
+description: |
+  Binding for NXP PCF82563ATL/PCF85363ATL devices when used in the
+  stopwatch mode. In this mode, the device provides a centi-seconds
+  (1/100th of a second) resolution operating over i2c.
+
+properties:
+  compatible:
+    enum:
+      - nxp,pcf85263atl
+      - nxp,pcf85363atl
+
+  reg:
+    maxItems: 1
+
+  quartz-load-femtofarads:
+    description:
+      The capacitive load of the quartz(x-tal).
+    enum: [6000, 7000, 12500]
+    default: 7000
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      counter@51 {
+        compatible = "nxp,pcf85363atl";
+        reg = <0x51>;
+        quartz-load-femtofarads = <7000>;
+      };
+    };
-- 
2.25.1