linux-kernel - [PATCH] dt-bindings: watchdog: Convert GPIO binding to json-schema

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Date:   Fri, 25 Nov 2022 12:29:04 +0100
From:   Robert Marko <robert.marko@...tura.hr>
To:     wim@...ux-watchdog.org, linux@...ck-us.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Robert Marko <robert.marko@...tura.hr>, luka.perkov@...tura.hr
Subject: [PATCH] dt-bindings: watchdog: Convert GPIO binding to json-schema

Convert the DT binding for GPIO WDT to JSON schema.

Cc: luka.perkov@...tura.hr
Signed-off-by: Robert Marko <robert.marko@...tura.hr>
---
 .../devicetree/bindings/watchdog/gpio-wdt.txt | 28 ----------
 .../bindings/watchdog/gpio-wdt.yaml           | 55 +++++++++++++++++++
 2 files changed, 55 insertions(+), 28 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
 create mode 100644 Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt b/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
deleted file mode 100644
index 198794963786..000000000000
--- a/Documentation/devicetree/bindings/watchdog/gpio-wdt.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-* GPIO-controlled Watchdog
-
-Required Properties:
-- compatible: Should contain "linux,wdt-gpio".
-- gpios: From common gpio binding; gpio connection to WDT reset pin.
-- hw_algo: The algorithm used by the driver. Should be one of the
-  following values:
-  - toggle: Either a high-to-low or a low-to-high transition clears
-    the WDT counter. The watchdog timer is disabled when GPIO is
-    left floating or connected to a three-state buffer.
-  - level: Low or high level starts counting WDT timeout,
-    the opposite level disables the WDT. Active level is determined
-    by the GPIO flags.
-- hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds).
-
-Optional Properties:
-- always-running: If the watchdog timer cannot be disabled, add this flag to
-  have the driver keep toggling the signal without a client. It will only cease
-  to toggle the signal when the device is open and the timeout elapsed.
-
-Example:
-	watchdog: watchdog {
-		/* ADM706 */
-		compatible = "linux,wdt-gpio";
-		gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
-		hw_algo = "toggle";
-		hw_margin_ms = <1600>;
-	};
diff --git a/Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml b/Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml
new file mode 100644
index 000000000000..155dc7965e9b
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/gpio-wdt.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/gpio-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO controlled watchdog
+
+maintainers:
+  - Robert Marko <robert.marko@...tura.hr>
+
+properties:
+  compatible:
+    const: linux,wdt-gpio
+
+  gpios:
+    maxItems: 1
+    description: GPIO connected to the WDT reset pin
+
+  hw_algo:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: Algorithm used by the driver
+    oneOf:
+      - description:
+          Either a high-to-low or a low-to-high transition clears the WDT counter.
+          The watchdog timer is disabled when GPIO is left floating or connected
+          to a three-state buffer.
+        const: toggle
+      - description:
+          Low or high level starts counting WDT timeout, the opposite level
+          disables the WDT.
+          Active level is determined by the GPIO flags.
+        const: level
+
+  hw_margin_ms:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Maximum time to reset watchdog circuit (in milliseconds)
+    minimum: 2
+    maximum: 65535
+
+  always-running:
+    type: boolean
+    description:
+      If the watchdog timer cannot be disabled, add this flag to have the driver
+      keep toggling the signal without a client.
+      It will only cease to toggle the signal when the device is open and the
+      timeout elapsed.
+
+required:
+  - compatible
+  - gpios
+  - hw_algo
+  - hw_margin_ms
+
+unevaluatedProperties: false
-- 
2.38.1