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Message-Id: <20211113094732.73889-1-sven@svenpeter.dev>
Date:   Sat, 13 Nov 2021 10:47:31 +0100
From:   Sven Peter <sven@...npeter.dev>
To:     Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Cc:     Sven Peter <sven@...npeter.dev>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 1/2] dt-bindings: watchdog: Add Apple Watchdog

Apple SoCs come with a simple embedded watchdog. This watchdog is also
required in order to reset the SoC.

Signed-off-by: Sven Peter <sven@...npeter.dev>
---
 .../bindings/watchdog/apple,wdt.yaml          | 52 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/apple,wdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/apple,wdt.yaml b/Documentation/devicetree/bindings/watchdog/apple,wdt.yaml
new file mode 100644
index 000000000000..e58c56a6fdf6
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/apple,wdt.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/apple,wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple SoC Watchdog
+
+allOf:
+  - $ref: "watchdog.yaml#"
+
+maintainers:
+  - Sven Peter <sven@...npeter.dev>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8103-wdt
+          - apple,t6000-wdt
+      - const: apple,wdt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/apple-aic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    wdt: watchdog@...00000 {
+        compatible = "apple,t8103-wdt", "apple,wdt";
+        reg = <0x50000000 0x4000>;
+        clocks = <&clk>;
+        interrupts = <AIC_IRQ 123 IRQ_TYPE_LEVEL_HIGH>;
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 5b7a13f706fa..ba480837724d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1749,6 +1749,7 @@ F:	Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
 F:	Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml
 F:	Documentation/devicetree/bindings/pci/apple,pcie.yaml
 F:	Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
+F:	Documentation/devicetree/bindings/watchdog/apple,wdt.yaml
 F:	arch/arm64/boot/dts/apple/
 F:	drivers/i2c/busses/i2c-pasemi-core.c
 F:	drivers/i2c/busses/i2c-pasemi-platform.c
-- 
2.25.1

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