mcp23s17gpio(4) - NetBSD Manual Pages

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MCPGPIO(4)              NetBSD Kernel Interfaces Manual             MCPGPIO(4)

mcpgpio -- Driver for Microchip I/O Expanders on I2C and SPI bus
I2C mcpgpio* at iic? addr ? gpio* at gpiobus? SPI mcpgpio0 at spi? slave 0 flags 0 mcpgpio1 at spi? slave 0 flags 1 mcpgpio2 at spi? slave 0 flags 2 mcpgpio3 at spi? slave 0 flags 3 gpio* at gpiobus?
The mcpgpio driver supports the following Microchip I/O Expanders: MCP23008 8-bit I/O expander, I2C interface MCP23S08 8-bit I/O expander, SPI interface MCP23017 16-bit I/O expander, I2C interface MCP23S17 16-bit I/O expander, SPI interface MCP23018 16-bit I/O expander, open-drain outputs, I2C interface MCP23S18 16-bit I/O expander, open-drain outputs, SPI interface Access to the pins is provided by the gpio(4) interface. The SPI version of these devices support multiple chips per chip select signal. On the MCP23S08 and MCP23S17, this is achieved by tying the address select pins to VDD or GND to select an address (0-3 on MCP23S08 or 0-7 on MCP23S17). The MCP23S18 has a similar capability, but uses an analog voltage input on a single address select pin, along with an inter- nal voltage divider ladder and a series of comparators to generate the 3 address bits; see the data sheet for details. The flags argument in the configuration directive for SPI attachments selects the hardware address of the chip instance for that driver instance.
gpio(4), iic(4), intro(4), spi(4)
The mcpgpio driver first appeared in NetBSD 7.0. It was overhauled in NetBSD 10.0 to support additional chip types and to add the I2C attach- ment.
The mcpgpio driver was written by Frank Kardel <> and Jason R. Thorpe <>.
SPI instances of the mcpgpio driver do not utilize the Device Tree bind- ings for this device. The mcpgpio driver does not currently act as a GPIO provider for the platform device tree. NetBSD 10.0 January 10, 2022 NetBSD 10.0
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