dt-bindings: mfd: Add bindings for sl28cpld

Add a device tree bindings for the board management controller found on
the Kontron SMARC-sAL28 board.
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/gpio/kontron,sl28cpld-gpio.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/kontron,sl28cpld-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO driver for the sl28cpld board management controller
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  This module is part of the sl28cpld multi-function device. For more
+  details see ../mfd/kontron,sl28cpld.yaml.
+
+  There are three flavors of the GPIO controller, one full featured
+  input/output with interrupt support (kontron,sl28cpld-gpio), one
+  output-only (kontron,sl28-gpo) and one input-only (kontron,sl28-gpi).
+
+  Each controller supports 8 GPIO lines.
+
+properties:
+  compatible:
+    enum:
+      - kontron,sl28cpld-gpio
+      - kontron,sl28cpld-gpi
+      - kontron,sl28cpld-gpo
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+
+  interrupt-controller: true
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-controller: true
+
+  gpio-line-names:
+      minItems: 1
+      maxItems: 8
+
+required:
+  - compatible
+  - "#gpio-cells"
+  - gpio-controller
+
+additionalProperties: false

Documentation/devicetree/bindings/hwmon/kontron,sl28cpld-hwmon.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/kontron,sl28cpld-hwmon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hardware monitoring driver for the sl28cpld board management controller
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  This module is part of the sl28cpld multi-function device. For more
+  details see ../mfd/kontron,sl28cpld.yaml.
+
+properties:
+  compatible:
+    enum:
+      - kontron,sl28cpld-fan
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+
+additionalProperties: false

Documentation/devicetree/bindings/interrupt-controller/kontron,sl28cpld-intc.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/kontron,sl28cpld-intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Interrupt controller driver for the sl28cpld board management controller
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  This module is part of the sl28cpld multi-function device. For more
+  details see ../mfd/kontron,sl28cpld.yaml.
+
+  The following interrupts are available. All types and levels are fixed
+  and handled by the board management controller.
+
+  ==== ============= ==================================
+   IRQ line/device   description
+  ==== ============= ==================================
+    0  RTC_INT#      Interrupt line from on-board RTC
+    1  SMB_ALERT#    Event on SMB_ALERT# line (P1)
+    2  ESPI_ALERT0#  Event on ESPI_ALERT0# line (S43)
+    3  ESPI_ALERT1#  Event on ESPI_ALERT1# line (S44)
+    4  PWR_BTN#      Event on PWR_BTN# line (P128)
+    5  SLEEP#        Event on SLEEP# line (S149)
+    6  watchdog      Interrupt of the internal watchdog
+    7  n/a           not used
+  ==== ============= ==================================
+
+properties:
+  compatible:
+    enum:
+      - kontron,sl28cpld-intc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+
+  interrupt-controller: true
+
+required:
+  - compatible
+  - interrupts
+  - "#interrupt-cells"
+  - interrupt-controller
+
+additionalProperties: false

Documentation/devicetree/bindings/mfd/kontron,sl28cpld.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/kontron,sl28cpld.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Kontron's sl28cpld board management controller
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  The board management controller may contain different IP blocks like
+  watchdog, fan monitoring, PWM controller, interrupt controller and a
+  GPIO controller.
+
+properties:
+  compatible:
+    const: kontron,sl28cpld
+
+  reg:
+    description:
+      I2C device address.
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  "#interrupt-cells":
+    const: 2
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-controller: true
+
+patternProperties:
+  "^gpio(@[0-9a-f]+)?$":
+    $ref: ../gpio/kontron,sl28cpld-gpio.yaml
+
+  "^hwmon(@[0-9a-f]+)?$":
+    $ref: ../hwmon/kontron,sl28cpld-hwmon.yaml
+
+  "^interrupt-controller(@[0-9a-f]+)?$":
+    $ref: ../interrupt-controller/kontron,sl28cpld-intc.yaml
+
+  "^pwm(@[0-9a-f]+)?$":
+    $ref: ../pwm/kontron,sl28cpld-pwm.yaml
+
+  "^watchdog(@[0-9a-f]+)?$":
+    $ref: ../watchdog/kontron,sl28cpld-wdt.yaml
+
+required:
+  - "#address-cells"
+  - "#size-cells"
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        sl28cpld@4a {
+            compatible = "kontron,sl28cpld";
+            reg = <0x4a>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            watchdog@4 {
+                compatible = "kontron,sl28cpld-wdt";
+                reg = <0x4>;
+                kontron,assert-wdt-timeout-pin;
+            };
+
+            hwmon@b {
+                compatible = "kontron,sl28cpld-fan";
+                reg = <0xb>;
+            };
+
+            pwm@c {
+                compatible = "kontron,sl28cpld-pwm";
+                reg = <0xc>;
+                #pwm-cells = <2>;
+            };
+
+            pwm@e {
+                compatible = "kontron,sl28cpld-pwm";
+                reg = <0xe>;
+                #pwm-cells = <2>;
+            };
+
+            gpio@10 {
+                compatible = "kontron,sl28cpld-gpio";
+                reg = <0x10>;
+                interrupts-extended = <&gpio2 6
+                               IRQ_TYPE_EDGE_FALLING>;
+
+                gpio-controller;
+                #gpio-cells = <2>;
+                gpio-line-names = "a", "b", "c";
+
+                interrupt-controller;
+                #interrupt-cells = <2>;
+            };
+
+            gpio@15 {
+                compatible = "kontron,sl28cpld-gpio";
+                reg = <0x15>;
+                interrupts-extended = <&gpio2 6
+                               IRQ_TYPE_EDGE_FALLING>;
+
+                gpio-controller;
+                #gpio-cells = <2>;
+
+                interrupt-controller;
+                #interrupt-cells = <2>;
+            };
+
+            gpio@1a {
+                compatible = "kontron,sl28cpld-gpo";
+                reg = <0x1a>;
+
+                gpio-controller;
+                #gpio-cells = <2>;
+            };
+
+            gpio@1b {
+                compatible = "kontron,sl28cpld-gpi";
+                reg = <0x1b>;
+
+                gpio-controller;
+                #gpio-cells = <2>;
+            };
+
+            interrupt-controller@1c {
+                compatible = "kontron,sl28cpld-intc";
+                reg = <0x1c>;
+                interrupts-extended = <&gpio2 6
+                               IRQ_TYPE_EDGE_FALLING>;
+
+                interrupt-controller;
+                #interrupt-cells = <2>;
+            };
+        };
+    };

Documentation/devicetree/bindings/pwm/kontron,sl28cpld-pwm.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/kontron,sl28cpld-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: PWM driver for the sl28cpld board management controller
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  This module is part of the sl28cpld multi-function device. For more
+  details see ../mfd/kontron,sl28cpld.yaml.
+
+  The controller supports one PWM channel and supports only four distinct
+  frequencies (250Hz, 500Hz, 1kHz, 2kHz).
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    const: kontron,sl28cpld-pwm
+
+  reg:
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 2
+
+required:
+  - compatible
+
+additionalProperties: false

Documentation/devicetree/bindings/watchdog/kontron,sl28cpld-wdt.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/kontron,sl28cpld-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Watchdog driver for the sl28cpld board management controller
+
+maintainers:
+  - Michael Walle <michael@walle.cc>
+
+description: |
+  This module is part of the sl28cpld multi-function device. For more
+  details see ../mfd/kontron,sl28cpld.yaml.
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    const: kontron,sl28cpld-wdt
+
+  reg:
+    maxItems: 1
+
+  kontron,assert-wdt-timeout-pin:
+    description: The SMARC standard defines a WDT_TIME_OUT# pin. If this
+      property is set, this output will be pulsed when the watchdog bites
+      and the system resets.
+    type: boolean
+
+required:
+  - compatible
+
+additionalProperties: false