linux-kernel - [PATCH v2 1/2] dt-bindings: watchdog: Add ARM smc wdt for mt8173 watchdog

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Message-Id: <20200421210403.v2.1.Id96574f1f52479d7a2f3b866b8a0552ab8c03d7f@changeid>
Date:   Tue, 21 Apr 2020 21:05:19 +1000
From:   Evan Benn <evanbenn@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     xingyu.chen@...ogic.com, jwerner@...omium.org,
        Evan Benn <evanbenn@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-watchdog@...r.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: watchdog: Add ARM smc wdt for mt8173 watchdog

This watchdog can be used on ARM systems with a Secure
Monitor firmware to forward watchdog operations to
firmware via a Secure Monitor Call.

Signed-off-by: Evan Benn <evanbenn@...omium.org>

---

Changes in v4:
- Add arm,smc-id property

Changes in v3:
- Change name back to arm

Changes in v2:
- Change name arm > mt8173

 .../bindings/watchdog/arm-smc-wdt.yaml        | 36 +++++++++++++++++++
 MAINTAINERS                                   |  6 ++++
 2 files changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/arm-smc-wdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/arm-smc-wdt.yaml b/Documentation/devicetree/bindings/watchdog/arm-smc-wdt.yaml
new file mode 100644
index 0000000000000..5379d9f798d84
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/arm-smc-wdt.yaml
@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/arm-smc-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Secure Monitor Call based watchdog
+
+allOf:
+  - $ref: "watchdog.yaml#"
+
+maintainers:
+  - Julius Werner <jwerner@...omium.org>
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt8173-smc-wdt
+  arm,smc-id:
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+      - default: 0x82003D06
+    description:
+      The ATF smc function id used by the firmware.
+
+required:
+  - compatible
+
+examples:
+  - |
+    watchdog {
+      compatible = "mediatek,mt8173-smc-wdt";
+      timeout-sec = <15>;
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index b816a453b10eb..0f2b39767bfa9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1457,6 +1457,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/interrupt-controller/arm,vic.txt
 F:	drivers/irqchip/irq-vic.c
 
+ARM SMC WATCHDOG DRIVER
+M:	Julius Werner <jwerner@...omium.org>
+R:	Evan Benn <evanbenn@...omium.org>
+S:	Maintained
+F:	devicetree/bindings/watchdog/arm-smc-wdt.yaml
+
 ARM SMMU DRIVERS
 M:	Will Deacon <will@...nel.org>
 R:	Robin Murphy <robin.murphy@....com>
-- 
2.26.1.301.g55bc3eb7cb9-goog