linux-kernel - [PATCH v6 1/2] dt-bindings: watchdog: Add ARM smc wdt for mt8173 watchdog

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Date:   Tue,  5 May 2020 13:13:30 +1000
From:   Evan Benn <evanbenn@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     jwerner@...omium.org, xingyu.chen@...ogic.com,
        Evan Benn <evanbenn@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        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-watchdog@...r.kernel.org
Subject: [PATCH v6 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 v6:
- Don't use dt default

Changes in v5:
- Change compatible to arm,smc-wdt

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        | 37 +++++++++++++++++++
 MAINTAINERS                                   |  6 +++
 2 files changed, 43 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..bec651541e0c8
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/arm-smc-wdt.yaml
@@ -0,0 +1,37 @@
+# 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:
+      - arm,smc-wdt
+  arm,smc-id:
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      The ATF smc function id used by the firmware.
+      Defaults to 0x82003D06 if unset.
+
+required:
+  - compatible
+
+examples:
+  - |
+    watchdog {
+      compatible = "arm,smc-wdt";
+      arm,smc-id = <0x82003D06>;
+      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>
-- 
2.26.2.526.g744177e7f7-goog