mvebu: puzzle-m902: add driver for MCU driving LEDs, fan and buzzer

Backport MFD driver for communicating with the on-board MCU found on
IEI World Puzzle appliances.
Improve the driver to support multiple LEDs, apply a default state and
let MCU take care of blinking if timing is within supported range.
Wire up LEDs and fan for Puzzle M902 in device tree.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-5.10/901-dt-bindings-Add-IEI-vendor-prefix-and-IEI-WT61P803-P.patch b/target/linux/mvebu/patches-5.10/901-dt-bindings-Add-IEI-vendor-prefix-and-IEI-WT61P803-P.patch
new file mode 100644
index 0000000000..28b2b19499
--- /dev/null
+++ b/target/linux/mvebu/patches-5.10/901-dt-bindings-Add-IEI-vendor-prefix-and-IEI-WT61P803-P.patch
@@ -0,0 +1,218 @@
+From aa4a0ccc41997f2da172165c92803abace43bd1c Mon Sep 17 00:00:00 2001
+From: Luka Kovacic <luka.kovacic () sartura ! hr>
+Date: Tue, 24 Aug 2021 12:44:32 +0000
+Subject: [PATCH 1/7] dt-bindings: Add IEI vendor prefix and IEI WT61P803
+ PUZZLE driver bindings
+
+Add the IEI WT61P803 PUZZLE Device Tree bindings for MFD, HWMON and LED
+drivers. A new vendor prefix is also added accordingly for
+IEI Integration Corp.
+
+Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
+Signed-off-by: Pavo Banicevic <pavo.banicevic@sartura.hr>
+Cc: Luka Perkov <luka.perkov@sartura.hr>
+Cc: Robert Marko <robert.marko@sartura.hr>
+---
+ .../hwmon/iei,wt61p803-puzzle-hwmon.yaml      | 53 ++++++++++++
+ .../leds/iei,wt61p803-puzzle-leds.yaml        | 39 +++++++++
+ .../bindings/mfd/iei,wt61p803-puzzle.yaml     | 82 +++++++++++++++++++
+ .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
+ 4 files changed, 176 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml
+ create mode 100644 Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml
+ create mode 100644 Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/hwmon/iei,wt61p803-puzzle-hwmon.yaml
+@@ -0,0 +1,53 @@
++# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
++%YAML 1.2
++---
++$id: http://devicetree.org/schemas/hwmon/iei,wt61p803-puzzle-hwmon.yaml#
++$schema: http://devicetree.org/meta-schemas/core.yaml#
++
++title: IEI WT61P803 PUZZLE MCU HWMON module from IEI Integration Corp.
++
++maintainers:
++  - Luka Kovacic <luka.kovacic@sartura.hr>
++
++description: |
++  This module is a part of the IEI WT61P803 PUZZLE MFD device. For more details
++  see Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml.
++
++  The HWMON module is a sub-node of the MCU node in the Device Tree.
++
++properties:
++  compatible:
++    const: iei,wt61p803-puzzle-hwmon
++
++  "#address-cells":
++    const: 1
++
++  "#size-cells":
++    const: 0
++
++patternProperties:
++  "^fan-group@[0-1]$":
++    type: object
++    properties:
++      reg:
++        minimum: 0
++        maximum: 1
++        description:
++          Fan group ID
++
++      cooling-levels:
++        minItems: 1
++        maxItems: 255
++        description:
++          Cooling levels for the fans (PWM value mapping)
++    description: |
++      Properties for each fan group.
++    required:
++      - reg
++
++required:
++  - compatible
++  - "#address-cells"
++  - "#size-cells"
++
++additionalProperties: false
+--- /dev/null
++++ b/Documentation/devicetree/bindings/leds/iei,wt61p803-puzzle-leds.yaml
+@@ -0,0 +1,39 @@
++# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
++%YAML 1.2
++---
++$id: http://devicetree.org/schemas/leds/iei,wt61p803-puzzle-leds.yaml#
++$schema: http://devicetree.org/meta-schemas/core.yaml#
++
++title: IEI WT61P803 PUZZLE MCU LED module from IEI Integration Corp.
++
++maintainers:
++  - Luka Kovacic <luka.kovacic@sartura.hr>
++
++description: |
++  This module is a part of the IEI WT61P803 PUZZLE MFD device. For more details
++  see Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml.
++
++  The LED module is a sub-node of the MCU node in the Device Tree.
++
++properties:
++  compatible:
++    const: iei,wt61p803-puzzle-leds
++
++  "#address-cells":
++    const: 1
++
++  "#size-cells":
++    const: 0
++
++  led@0:
++    type: object
++    $ref: common.yaml
++    description: |
++      Properties for a single LED.
++
++required:
++  - compatible
++  - "#address-cells"
++  - "#size-cells"
++
++additionalProperties: false
+--- /dev/null
++++ b/Documentation/devicetree/bindings/mfd/iei,wt61p803-puzzle.yaml
+@@ -0,0 +1,82 @@
++# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
++%YAML 1.2
++---
++$id: http://devicetree.org/schemas/mfd/iei,wt61p803-puzzle.yaml#
++$schema: http://devicetree.org/meta-schemas/core.yaml#
++
++title: IEI WT61P803 PUZZLE MCU from IEI Integration Corp.
++
++maintainers:
++  - Luka Kovacic <luka.kovacic@sartura.hr>
++
++description: |
++  IEI WT61P803 PUZZLE MCU is embedded in some IEI Puzzle series boards.
++  It's used for controlling system power states, fans, LEDs and temperature
++  sensors.
++
++  For Device Tree bindings of other sub-modules (HWMON, LEDs) refer to the
++  binding documents under the respective subsystem directories.
++
++properties:
++  compatible:
++    const: iei,wt61p803-puzzle
++
++  current-speed:
++    description:
++      Serial bus speed in bps
++    maxItems: 1
++
++  enable-beep: true
++
++  hwmon:
++    $ref: /schemas/hwmon/iei,wt61p803-puzzle-hwmon.yaml
++
++  leds:
++    $ref: /schemas/leds/iei,wt61p803-puzzle-leds.yaml
++
++required:
++  - compatible
++  - current-speed
++
++additionalProperties: false
++
++examples:
++  - |
++    #include <dt-bindings/leds/common.h>
++    serial {
++        mcu {
++            compatible = "iei,wt61p803-puzzle";
++            current-speed = <115200>;
++            enable-beep;
++
++            leds {
++                compatible = "iei,wt61p803-puzzle-leds";
++                #address-cells = <1>;
++                #size-cells = <0>;
++
++                led@0 {
++                    reg = <0>;
++                    function = LED_FUNCTION_POWER;
++                    color = <LED_COLOR_ID_BLUE>;
++                };
++            };
++
++            hwmon {
++                compatible = "iei,wt61p803-puzzle-hwmon";
++                #address-cells = <1>;
++                #size-cells = <0>;
++
++                fan-group@0 {
++                    #cooling-cells = <2>;
++                    reg = <0x00>;
++                    cooling-levels = <64 102 170 230 250>;
++                };
++
++                fan-group@1 {
++                    #cooling-cells = <2>;
++                    reg = <0x01>;
++                    cooling-levels = <64 102 170 230 250>;
++                };
++            };
++        };
++    };
+--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
++++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
+@@ -475,6 +475,8 @@ patternProperties:
+     description: IC Plus Corp.
+   "^idt,.*":
+     description: Integrated Device Technologies, Inc.
++  "^iei,.*":
++    description: IEI Integration Corp.
+   "^ifi,.*":
+     description: Ingenieurburo Fur Ic-Technologie (I/F/I)
+   "^ilitek,.*":