linux-kernel - [PATCH 01/10] dt-bindings: watchdog: sp-805: Convert to Json-schema

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Date:   Fri, 28 Aug 2020 14:05:53 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Viresh Kumar <vireshk@...nel.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chanho Min <chanho.min@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Liviu Dudau <liviu.dudau@....com>,
        Li Yang <leoyang.li@....com>, Shawn Guo <shawnguo@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Sudeep Holla <sudeep.holla@....com>,
        Wei Xu <xuwei5@...ilicon.com>
Subject: [PATCH 01/10] dt-bindings: watchdog: sp-805: Convert to Json-schema

Convert the ARM SP-805 watchdog IP DT binding over to Json-schema.

A straight-forward conversion, but the requirement for providing two
clocks got strengthened from "should" to "must".

Signed-off-by: Andre Przywara <andre.przywara@....com>
---
 .../bindings/watchdog/arm,sp805.txt           | 32 --------
 .../bindings/watchdog/arm,sp805.yaml          | 75 +++++++++++++++++++
 2 files changed, 75 insertions(+), 32 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/watchdog/arm,sp805.txt
 create mode 100644 Documentation/devicetree/bindings/watchdog/arm,sp805.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/arm,sp805.txt b/Documentation/devicetree/bindings/watchdog/arm,sp805.txt
deleted file mode 100644
index bee6f1f0e41b..000000000000
--- a/Documentation/devicetree/bindings/watchdog/arm,sp805.txt
+++ /dev/null
@@ -1,32 +0,0 @@
-ARM AMBA Primecell SP805 Watchdog
-
-SP805 WDT is a ARM Primecell Peripheral and has a standard-id register that
-can be used to identify the peripheral type, vendor, and revision.
-This value can be used for driver matching.
-
-As SP805 WDT is a primecell IP, it follows the base bindings specified in
-'arm/primecell.txt'
-
-Required properties:
-- compatible:  Should be "arm,sp805" & "arm,primecell"
-- reg:         Should contain location and length for watchdog timer register
-- clocks:      Clocks driving the watchdog timer hardware. This list should be
-               2 clocks. With 2 clocks, the order is wdog_clk, apb_pclk
-               wdog_clk can be equal to or be a sub-multiple of the apb_pclk
-               frequency
-- clock-names: Shall be "wdog_clk" for first clock and "apb_pclk" for the
-               second one
-
-Optional properties:
-- interrupts:  Should specify WDT interrupt number
-- timeout-sec: Should specify default WDT timeout in seconds. If unset, the
-               default timeout is determined by the driver
-
-Example:
-	watchdog@...90000 {
-		compatible = "arm,sp805", "arm,primecell";
-		reg = <0x66090000 0x1000>;
-		interrupts = <GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&wdt_clk>, <&apb_pclk>;
-		clock-names = "wdog_clk", "apb_pclk";
-	};
diff --git a/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml b/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml
new file mode 100644
index 000000000000..980e155d3387
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/arm,sp805.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/arm,sp805.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM AMBA Primecell SP805 Watchdog
+
+maintainers:
+  - Viresh Kumar <vireshk@...nel.org>
+
+description: |+
+  The Arm SP805 IP implements a watchdog device, which triggers an interrupt
+  after a configurable time period. If that interrupt has not been serviced
+  when the next interrupt would be triggered, the reset signal is asserted.
+
+allOf:
+  - $ref: /schemas/arm/primecell.yaml#
+
+# Need a custom select here or 'arm,primecell' will match on lots of nodes
+select:
+  properties:
+    compatible:
+      contains:
+        const: arm,sp805
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - const: arm,sp805
+      - const: arm,primecell
+
+  interrupts:
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: |
+      Clocks driving the watchdog timer hardware. The first clock is used
+      for the actual watchdog counter. The second clock drives the register
+      interface.
+    minItems: 2
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: wdog_clk
+      - const: apb_pclk
+
+  timeout-sec:
+    description: |
+      Should specify default WDT timeout in seconds. If unset, the default
+      timeout is determined by the driver.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    watchdog@...90000 {
+        compatible = "arm,sp805", "arm,primecell";
+        reg = <0x66090000 0x1000>;
+        interrupts = <GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&wdt_clk>, <&apb_pclk>;
+        clock-names = "wdog_clk", "apb_pclk";
+    };
-- 
2.17.1