linux-kernel - [PATCH 1/3] dt-bindings: watchdog: add Marvell AC5 watchdog

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Message-ID: <20231214150414.1849058-2-enachman@marvell.com>
Date:   Thu, 14 Dec 2023 17:04:12 +0200
From:   Elad Nachman <enachman@...vell.com>
To:     <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <gregory.clement@...tlin.com>,
        <chris.packham@...iedtelesis.co.nz>, <andrew@...n.ch>,
        <fu.wei@...aro.org>, <Suravee.Suthikulpanit@....com>,
        <al.stone@...aro.org>, <timur@...eaurora.org>,
        <linux-watchdog@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <enachman@...vell.com>, <cyuval@...vell.com>
Subject: [PATCH 1/3] dt-bindings: watchdog: add Marvell AC5 watchdog

From: Elad Nachman <enachman@...vell.com>

Add definitions and examples for Marvell AC5 variant
of the sbsa watchdog.
Marvell variant requires more memory definitions,
since the initialization is more complex, and involves
several register sets.

Signed-off-by: Elad Nachman <enachman@...vell.com>
---
 .../bindings/watchdog/arm,sbsa-gwdt.yaml      | 52 ++++++++++++++++++-
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml b/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml
index aa804f96acba..331e9aa7c2f7 100644
--- a/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml
@@ -20,12 +20,17 @@ allOf:
 
 properties:
   compatible:
-    const: arm,sbsa-gwdt
+    enum:
+      - arm,sbsa-gwdt
+      - marvell,ac5-wd
 
   reg:
     items:
       - description: Watchdog control frame
       - description: Refresh frame
+      - description: Marvell CPU control frame
+      - description: Marvell Management frame
+      - description: Marvell reset control unit frame
 
   interrupts:
     description: The Watchdog Signal 0 (WS0) SPI (Shared Peripheral Interrupt)
@@ -39,12 +44,55 @@ required:
 unevaluatedProperties: false
 
 examples:
+  # First example is for generic ARM one
+  # Next examples are for Marvell.
+  # They are organized as three sets:
+  # first set is for global watchdog, then CPU core #0 private watchdog,
+  # and finally CPU core #1 private watchdog
+  # Examples are given for AC5 or Ironman. For AC5X SOC, the last
+  # reg item's low address (0x840F8000) should be replaced with 0x944F8000
   - |
     watchdog@...40000 {
         compatible = "arm,sbsa-gwdt";
         reg = <0x2a440000 0x1000>,
-              <0x2a450000 0x1000>;
+              <0x2a450000 0x1000>,
+              <0x0 0x0>,
+              <0x0 0x0>,
+              <0x0 0x0>;
         interrupts = <0 27 4>;
         timeout-sec = <30>;
     };
+  - |
+    watchdog@...16000 {
+        compatible = "marvell,ac5-wd";
+        reg = <0x80216000 0x1000>,
+              <0x80215000 0x1000>,
+              <0x80210000 0x1000>,
+              <0x7f900000 0x1000>,
+              <0x840F8000 0x1000>;
+        interrupts = <0 124 4>;
+        timeout-sec = <30>;
+    };
+  - |
+    watchdog@...12000 {
+        compatible = "marvell,ac5-wd";
+        reg = <0x80212000 0x1000>,
+              <0x80211000 0x1000>,
+              <0x80210000 0x1000>,
+              <0x7f900000 0x1000>,
+              <0x840F8000 0x1000>;
+        interrupts = <0 122 4>;
+        timeout-sec = <30>;
+    };
+  - |
+    watchdog@...14000 {
+        compatible = "marvell,ac5-wd";
+        reg = <0x80214000 0x1000>,
+              <0x80213000 0x1000>,
+              <0x80210000 0x1000>,
+              <0x7f900000 0x1000>,
+              <0x840F8000 0x1000>;
+        interrupts = <0 122 4>;
+        timeout-sec = <30>;
+    };
 ...
-- 
2.25.1