linux-kernel - [PATCH v2 1/2] dt-bindings: mfd: Add sony,cronos-cpld

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Date:   Tue, 28 Nov 2023 15:00:08 -0600
From:   Shawn Anastasio <sanastasio@...torengineering.com>
To:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lee Jones <lee@...nel.org>,
        Georgy Yakovlev <Georgy.Yakovlev@...y.com>
Cc:     Timothy Pearson <tpearson@...torengineering.com>,
        Shawn Anastasio <sanastasio@...torengineering.com>
Subject: [PATCH v2 1/2] dt-bindings: mfd: Add sony,cronos-cpld

The Sony Cronos Platform Controller CPLD is a multi-purpose platform
controller that provides both a watchdog timer and an LED controller for
the Sony Interactive Entertainment Cronos x86 server platform. As both
functions are provided by the same CPLD, a multi-function device is
exposed as the parent of both functions.

Add a DT binding for this device.

Signed-off-by: Shawn Anastasio <sanastasio@...torengineering.com>
---
Changes in v2:
  - Change SIE to Sony to use the already-established prefix.
  - Clarify that Cronos is an x86 server platform in description
  - Drop #address-cells/#size-cells
  - Add missing additionalProperties to leds/watchdog objects
  - Add sony,led-mask property to leds object
  - Add sony,default-timeout property to watchdog object
  - Update example

 .../bindings/mfd/sony,cronos-cpld.yaml        | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/sony,cronos-cpld.yaml

diff --git a/Documentation/devicetree/bindings/mfd/sony,cronos-cpld.yaml b/Documentation/devicetree/bindings/mfd/sony,cronos-cpld.yaml
new file mode 100644
index 000000000000..df2c2e83ccb4
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sony,cronos-cpld.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2023 Raptor Engineering, LLC
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/sony,cronos-cpld.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sony Cronos Platform Controller CPLD multi-function device
+
+maintainers:
+  - Timothy Pearson <tpearson@...torengineering.com>
+
+description: |
+  The Sony Cronos Platform Controller CPLD is a multi-purpose platform
+  controller that provides both a watchdog timer and an LED controller for the
+  Sony Interactive Entertainment Cronos x86 server platform. As both functions
+  are provided by the same CPLD, a multi-function device is exposed as the
+  parent of both functions.
+
+properties:
+  compatible:
+    const: sony,cronos-cpld
+
+  reg:
+    maxItems: 1
+
+  leds:
+    type: object
+    description: Cronos Platform Status LEDs
+
+    properties:
+      compatible:
+        const: sony,cronos-leds
+
+      sony,led-mask:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0x0
+        maximum: 0x7fff
+        description: |
+          A bitmask that specifies which LEDs are present and can be controlled
+          by the Cronos CPLD. Bits 0-5 correspond to platform Status LEDs, bits
+          6-10 correspond to Link LEDs, and bits 11-14 correspond to the Power
+          State LEDs. All other bits are unused. The default value is 0x7fff
+          (all possible LEDs enabled).
+
+    additionalProperties: false
+
+  watchdog:
+    type: object
+    description: Cronos Platform Watchdog Timer
+
+    properties:
+      compatible:
+        const: sony,cronos-watchdog
+
+      sony,default-timeout:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+          The default timeout with which the watchdog timer is initialized, in
+          seconds. Supported values are: 10, 20, 30, 40, 50, 60, 70, 80. All
+          other values will be rounded down to the nearest supported value.  The
+          default value is 80.
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      cpld@3f {
+        compatible = "sony,cronos-cpld";
+        reg = <0x3f>;
+
+        watchdog {
+          compatible = "sony,cronos-watchdog";
+          sony,default-timeout = <20>;
+        };
+
+        leds {
+          compatible = "sony,cronos-leds";
+          sony,led-mask = <0x7fff>;
+        };
+      };
+    };
--
2.30.2