[PATCH v14 01/10] dt-bindings: mfd: gpio: Add MAX7360

Mathieu Dubois-Briand
2025-08-24T11:57:58Z

Add device tree bindings for Maxim Integrated MAX7360 device with
support for keypad, rotary, gpios and pwm functionalities.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
---
.../bindings/gpio/maxim,max7360-gpio.yaml | 83 +++++++++
.../devicetree/bindings/mfd/maxim,max7360.yaml | 191 +++++++++++++++++++++
2 files changed, 274 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/maxim,max7360-gpio.yaml b/Documentation/devicetree/bindings/gpio/maxim,max7360-gpio.yaml
new file mode 100644
index 000000000000..c5c3fc4c816f
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/maxim,max7360-gpio.yaml
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/maxim,max7360-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim MAX7360 GPIO controller
+
+maintainers:
+ - Kamel Bouhara <kamel.bouhara@bootlin.com>
+ - Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
+
+description: |
+ Maxim MAX7360 GPIO controller, in MAX7360 chipset
+ https://www.analog.com/en/products/max7360.html
+
+ The device provides two series of GPIOs, referred here as GPIOs and GPOs.
+
+ PORT0 to PORT7 pins can be used as GPIOs, with support for interrupts and
+ constant-current mode. These pins will also be used by the rotary encoder and
+ PWM functionalities.
+
+ COL2 to COL7 pins can be used as GPOs, there is no input capability. COL pins
+ will be partitioned, with the first pins being affected to the keypad
+ functionality and the last ones as GPOs.
+
+properties:
+ compatible:
+ enum:
+ - maxim,max7360-gpio
+ - maxim,max7360-gpo
+
+ gpio-controller: true
+
+ "#gpio-cells":
+ const: 2
+
+ interrupt-controller: true
+
+ "#interrupt-cells":
+ const: 2
+
+ maxim,constant-current-disable:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Bit field, each bit disables constant-current output of the associated
+ GPIO, starting from the least significant bit for the first GPIO.
+ maximum: 0xff
+
+required:
+ - compatible
+ - gpio-controller
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - maxim,max7360-gpio
+ ngpios: false
+ then:
+ required:
+ - interrupt-controller
+ else:
+ properties:
+ interrupt-controller: false
+ maxim,constant-current-disable: false
+
+additionalProperties: false
+
+examples:
+ - |
+ gpio {
+ compatible = "maxim,max7360-gpio";
+
+ gpio-controller;
+ #gpio-cells = <2>;
+ maxim,constant-current-disable = <0x06>;
+
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
diff --git a/Documentation/devicetree/bindings/mfd/maxim,max7360.yaml b/Documentation/devicetree/bindings/mfd/maxim,max7360.yaml
new file mode 100644
index 000000000000..3fc920c8639d
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/maxim,max7360.yaml
@@ -0,0 +1,191 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/maxim,max7360.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim MAX7360 Keypad, Rotary encoder, PWM and GPIO controller
+
+maintainers:
+ - Kamel Bouhara <kamel.bouhara@bootlin.com>
+ - Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
+
+description: |
+ Maxim MAX7360 device, with following functions:
+ - keypad controller
+ - rotary controller
+ - GPIO and GPO controller
+ - PWM controller
+
+ https://www.analog.com/en/products/max7360.html
+
+allOf:
+ - $ref: /schemas/input/matrix-keymap.yaml#
+ - $ref: /schemas/input/input.yaml#
+
+properties:
+ compatible:
+ enum:
+ - maxim,max7360
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 2
+
+ interrupt-names:
+ items:
+ - const: inti
+ - const: intk
+
+ keypad-debounce-delay-ms:
+ description: Keypad debounce delay in ms
+ minimum: 9
+ maximum: 40
+ default: 9
+
+ rotary-debounce-delay-ms:
+ description: Rotary encoder debounce delay in ms
+ minimum: 0
+ maximum: 15
+ default: 0
+
+ linux,axis:
+ $ref: /schemas/input/rotary-encoder.yaml#/properties/linux,axis
+
+ rotary-encoder,relative-axis:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Register a relative axis rather than an absolute one.
+
+ rotary-encoder,steps:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 24
+ description:
+ Number of steps in a full turnaround of the
+ encoder. Only relevant for absolute axis. Defaults to 24 which is a
+ typical value for such devices.
+
+ rotary-encoder,rollover:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description:
+ Automatic rollover when the rotary value becomes
+ greater than the specified steps or smaller than 0. For absolute axis only.
+
+ "#pwm-cells":
+ const: 3
+
+ gpio:
+ $ref: /schemas/gpio/maxim,max7360-gpio.yaml#
+ description:
+ PORT0 to PORT7 general purpose input/output pins configuration.
+
+ gpo:
+ $ref: /schemas/gpio/maxim,max7360-gpio.yaml#
+ description: >
+ COL2 to COL7 general purpose output pins configuration. Allows to use
+ unused keypad columns as outputs.
+
+ The MAX7360 has 8 column lines and 6 of them can be used as GPOs. GPIOs
+ numbers used for this gpio-controller node do correspond to the column
+ numbers: values 0 and 1 are never valid, values from 2 to 7 might be valid
+ depending on the value of the keypad,num-column property.
+
+patternProperties:
+ '-pins$':
+ type: object
+ description:
+ Pinctrl node's client devices use subnodes for desired pin configuration.
+ Client device subnodes use below standard properties.
+ $ref: /schemas/pinctrl/pincfg-node.yaml
+
+ properties:
+ pins:
+ description:
+ List of gpio pins affected by the properties specified in this
+ subnode.
+ items:
+ pattern: '^(PORT[0-7]|ROTARY)$'
+ minItems: 1
+ maxItems: 8
+
+ function:
+ description:
+ Specify the alternative function to be configured for the specified
+ pins.
+ enum: [gpio, pwm, rotary]
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - interrupt-names
+ - linux,keymap
+ - linux,axis
+ - "#pwm-cells"
+ - gpio
+ - gpo
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/input/input.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ io-expander@38 {
+ compatible = "maxim,max7360";
+ reg = <0x38>;
+
+ interrupt-parent = <&gpio1>;
+ interrupts = <23 IRQ_TYPE_LEVEL_LOW>,
+ <24 IRQ_TYPE_LEVEL_LOW>;
+ interrupt-names = "inti", "intk";
+
+ keypad,num-rows = <8>;
+ keypad,num-columns = <4>;
+ linux,keymap = <
+ MATRIX_KEY(0x00, 0x00, KEY_F5)
+ MATRIX_KEY(0x01, 0x00, KEY_F4)
+ MATRIX_KEY(0x02, 0x01, KEY_F6)
+ >;
+ keypad-debounce-delay-ms = <10>;
+ autorepeat;
+
+ rotary-debounce-delay-ms = <2>;
+ linux,axis = <0>; /* REL_X */
+ rotary-encoder,relative-axis;
+
+ #pwm-cells = <3>;
+
+ max7360_gpio: gpio {
+ compatible = "maxim,max7360-gpio";
+
+ gpio-controller;
+ #gpio-cells = <2>;
+ maxim,constant-current-disable = <0x06>;
+
+ interrupt-controller;
+ #interrupt-cells = <0x2>;
+ };
+
+ max7360_gpo: gpo {
+ compatible = "maxim,max7360-gpo";
+
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ backlight_pins: backlight-pins {
+ pins = "PORT2";
+ function = "pwm";
+ };
+ };
+ };

--
2.39.5