linux-kernel - [PATCH V2 2/4] dt-bindings: watchdog: xlnx,versal-wwdt: Add versal watchdog bindings

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Date:   Wed, 1 Mar 2023 23:22:27 +0530
From:   Srinivas Neeli <srinivas.neeli@....com>
To:     <linux@...ck-us.net>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <michal.simek@....com>,
        <neelisrinivas18@...il.com>
CC:     <wim@...ux-watchdog.org>, <linux-watchdog@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <git@...inx.com>, <git@....com>,
        <devicetree@...r.kernel.org>
Subject: [PATCH V2 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.

Updated devicetree bindings for adding versal window watchdog device.

Signed-off-by: Srinivas Neeli <srinivas.neeli@....com>
---
Changes in V2:
- Added watchdog ref
- Removed timeout-sec property
- Used 4 spaces for example indentation.
---
 .../bindings/watchdog/xlnx,versal-wwdt.yaml   | 58 +++++++++++++++++++
 1 file changed, 58 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..733de1ac60e8
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml
@@ -0,0 +1,58 @@
+# 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
+
+  xlnx,close_percent:
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 1
+    maximum: 99
+    default: 50
+    description: closed window percentage
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    watchdog@...d0000 {
+        compatible = "xlnx,versal-wwdt";
+        reg = <0xfd4d0000 0x10000>;
+        clocks = <&clock25>;
+        timeout-sec = <30>;
+        xlnx,close_percent = <25>;
+    };
+...
-- 
2.25.1