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60 lines
2.2 KiB
Plaintext
60 lines
2.2 KiB
Plaintext
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* MAX732x-compatible I/O expanders
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Required properties:
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- compatible: Should be one of the following:
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- "maxim,max7319": For the Maxim MAX7319
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- "maxim,max7320": For the Maxim MAX7320
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- "maxim,max7321": For the Maxim MAX7321
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- "maxim,max7322": For the Maxim MAX7322
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- "maxim,max7323": For the Maxim MAX7323
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- "maxim,max7324": For the Maxim MAX7324
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- "maxim,max7325": For the Maxim MAX7325
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- "maxim,max7326": For the Maxim MAX7326
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- "maxim,max7327": For the Maxim MAX7327
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- reg: I2C slave address for this device.
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells: Should be 2.
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- first cell is the GPIO number
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- second cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
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Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
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Optional properties:
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The I/O expander can detect input state changes, and thus optionally act as
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an interrupt controller. When the expander interrupt line is connected all the
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following properties must be set. For more information please see the
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interrupt controller device tree bindings documentation available at
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Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
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- interrupt-controller: Identifies the node as an interrupt controller.
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- #interrupt-cells: Number of cells to encode an interrupt source, shall be 2.
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- first cell is the pin number
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- second cell is used to specify flags
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- interrupt-parent: phandle of the parent interrupt controller.
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- interrupts: Interrupt specifier for the controllers interrupt.
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Please refer to gpio.txt in this directory for details of the common GPIO
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bindings used by client devices.
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Example 1. MAX7325 with interrupt support enabled (CONFIG_GPIO_MAX732X_IRQ=y):
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expander: max7325@6d {
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compatible = "maxim,max7325";
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reg = <0x6d>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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interrupt-parent = <&gpio4>;
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interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
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};
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Example 2. MAX7325 with interrupt support disabled (CONFIG_GPIO_MAX732X_IRQ=n):
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expander: max7325@6d {
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compatible = "maxim,max7325";
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reg = <0x6d>;
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gpio-controller;
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#gpio-cells = <2>;
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};
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