linux-kernel - [PATCH V3 2/4] dt-bindings: watchdog: xlnx,versal-wwdt: Add versal watchdog bindings

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Message-ID: <20230331074117.356339-3-srinivas.neeli@amd.com>
Date:   Fri, 31 Mar 2023 13:11:15 +0530
From:   Srinivas Neeli <srinivas.neeli@....com>
To:     <shubhrajyoti.datta@....com>, <michal.simek@....com>,
        <srinivas.goud@....com>, <wim@...ux-watchdog.org>,
        <linux@...ck-us.net>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <srinivas.neeli@....com>, <linux-watchdog@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <git@....com>,
        <git@...inx.com>, <neelisrinivas18@...il.com>
Subject: [PATCH V3 2/4] dt-bindings: watchdog: xlnx,versal-wwdt: Add versal watchdog bindings

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.

This patch adds devicetree bindings for versal window watchdog device.

Signed-off-by: Srinivas Neeli <srinivas.neeli@....com>
---
Changes in V3:
- Removed  xlnx,close_percent property.
Changes in V2:
- Added watchdog ref
- Removed timeout-sec property
- Used 4 spaces for example indentation.
---
 .../bindings/watchdog/xlnx,versal-wwdt.yaml   | 50 +++++++++++++++++++
 1 file changed, 50 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..dea1e7c487d3
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
@@ -0,0 +1,50 @@
+# 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.
+
+allOf:
+  - $ref: /schemas/watchdog/watchdog.yaml#
+
+properties:
+  compatible:
+    enum:
+      - xlnx,versal-wwdt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    watchdog@...d0000 {
+        compatible = "xlnx,versal-wwdt";
+        reg = <0xfd4d0000 0x10000>;
+        clocks = <&clock25>;
+        timeout-sec = <30>;
+    };
+...
-- 
2.25.1