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microchip,mcp23017 (on i2c bus)

Vendor: Microchip Technology Inc.

Description

This is a representation of the Microchip MCP23017 I2C Gpio Expander.

Properties

Properties not inherited from the base binding file.

Name

Type

Details

ngpios

int

Number of gpios supported by the chip.

This property is required.

Default value: 32

Constant value: 16

gpio-controller

boolean

Convey's this node is a GPIO controller

This property is required.

#gpio-cells

int

Number of items to expect in a GPIO specifier

This property is required.

gpio-reserved-ranges

array

If not all the GPIOs at offsets 0...N-1 are usable for ngpios = <N>, then
this property contains an additional set of tuples which specify which GPIOs
are unusable. This property indicates the start and size of the GPIOs
that can't be used.

For example, setting "gpio-reserved-ranges = <3 2>, <10 1>;" means that
GPIO offsets 3, 4, and 10 are not usable, even if ngpios = <18>.

gpio-line-names

string-array

This is an array of strings defining the names of the GPIO lines
going out of the GPIO controller

supply-gpios

phandle-array

GPIO specifier that controls power to the device.

This property should be provided when the device has a dedicated
switch that controls power to the device.  The supply state is
entirely the responsibility of the device driver.

Contrast with vin-supply.

vin-supply

phandle

Reference to the regulator that controls power to the device.
The referenced devicetree node must have a regulator compatible.

This property should be provided when device power is supplied
by a shared regulator.  The supply state is dependent on the
request status of all devices fed by the regulator.

Contrast with supply-gpios.  If both properties are provided
then the regulator must be requested before the supply GPIOS is
set to an active state, and the supply GPIOS must be set to an
inactive state before releasing the regulator.

Specifier cell names

  • gpio cells: pin, flags