linux-kernel - [PATCH 1/3] dt-bindings: watchdog: xlnx,versal-wwdt: Add binding documentation for xilinx window watchdog device

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Message-ID: <20220927110257.41963-2-srinivas.neeli@amd.com>
Date:   Tue, 27 Sep 2022 16:32:55 +0530
From:   Srinivas Neeli <srinivas.neeli@....com>
To:     <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <srinivas.neeli@....com>, <shubhrajyoti.datta@....com>,
        <michal.simek@....com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-watchdog@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <git@....com>
Subject: [PATCH 1/3] dt-bindings: watchdog: xlnx,versal-wwdt: Add binding documentation for xilinx window watchdog device

Add documentation for the binding of window watchdog device.

Signed-off-by: Srinivas Neeli <srinivas.neeli@....com>
---
 .../bindings/watchdog/xlnx,versal-wwdt.yaml   | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
new file mode 100644
index 000000000000..986455efa6f4
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/xlnx,versal-wwdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx Versal window watchdog timer controller
+
+maintainers:
+  - Neeli Srinivas <srinivas.neeli@....com>
+
+description:
+  Versal watchdog driver uses window watchdog mode. Window watchdog
+  timer(WWDT) contains closed(first) and open(second) window with
+  32 bit width. Write to the watchdog timer within predefined window
+  periods of time. This means a period that is not too soon and a
+  period that is not too late. The WWDT has to be restarted within
+  the open window time. If software tries to restart WWDT outside of
+  the open window time period, it generates a reset.
+
+properties:
+  compatible:
+    enum:
+      - xlnx,versal-wwdt-1.0
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  timeout-sec: true
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+        watchdog@...d0000 {
+           compatible = "xlnx,versal-wwdt-1.0";
+           reg = <0xfd4d0000 0x10000>;
+           clocks = <&clock25>;
+           timeout-sec = <30>;
+        };
+...
-- 
2.17.1