linux-kernel - [PATCH v3 1/5] dt-bindings: mfd: add Khadas Microcontroller bindings

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Message-Id: <20200608091739.2368-2-narmstrong@baylibre.com>
Date:   Mon,  8 Jun 2020 11:17:35 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     lee.jones@...aro.org, rui.zhang@...el.com,
        amit.kucheria@...durent.com, daniel.lezcano@...aro.org,
        devicetree@...r.kernel.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v3 1/5] dt-bindings: mfd: add Khadas Microcontroller bindings

This Microcontroller is present on the Khadas VIM1, VIM2, VIM3 and Edge
boards.

It has multiple boot control features like password check, power-on
options, power-off control and system FAN control on recent boards.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
 .../devicetree/bindings/mfd/khadas,mcu.yaml   | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/khadas,mcu.yaml

diff --git a/Documentation/devicetree/bindings/mfd/khadas,mcu.yaml b/Documentation/devicetree/bindings/mfd/khadas,mcu.yaml
new file mode 100644
index 000000000000..a3b976f101e8
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/khadas,mcu.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/khadas,mcu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Khadas on-board Microcontroller Device Tree Bindings
+
+maintainers:
+  - Neil Armstrong <narmstrong@...libre.com>
+
+description: |
+  Khadas embeds a microcontroller on their VIM and Edge boards adding some
+  system feature as PWM Fan control (for VIM2 rev14 or VIM3), User memory
+  storage, IR/Key resume control, system power LED control and more.
+
+properties:
+  compatible:
+    enum:
+      - khadas,mcu # MCU revision is discoverable
+
+  "#cooling-cells": # Only needed for boards having FAN control feature
+    const: 2
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      khadas_mcu: system-controller@18 {
+        compatible = "khadas,mcu";
+        reg = <0x18>;
+        #cooling-cells = <2>;
+      };
+    };
-- 
2.22.0