IO expander hardware components

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1. Article purpose[edit source]

The purpose of this article is to:

list the IO expanders hardware components that might be integrated in the different STM32MPU boards
link these components to the corresponding software framework(s)
point to the datasheet(s) of these components
explain, when necessary, how to configure these components.

2. Software frameworks[edit source]

Internal peripherals software table template

| Core/IOs
| ST Multi Function eXpander
| 
| Linux IOs pins overview
| 
| IO expander
|-
| Core/IOs
| MCP23017
| 
| Linux IOs pins overview
| 
| IO expander
|-
|}

3. ST Multi-Function eXpander[edit source]

The ST MFX is an STM32L152 slave controller whose firmware embeds IO expander feature with 16 GPIOs + 8 extra if other features (resistive touchscreen controller and IDD measurement) are not enabled.

For details, refer to https://www.st.com/resource/en/user_manual/um2535-evaluation-boards-with-stm32mp157-mpus-stmicroelectronics.pdf chapter MFX IO expander.

3.1. Linux driver[edit source]

Bindings: Documentation/devicetree/bindings/mfd/st,stmfx.yaml

Sources:

drivers/pinctrl/pinctrl-stmfx.c

4. MCP23017[edit source]

The MCP23017 is a 16-bit input/output port expander with interrupt output.

For details and the datasheet please contact the MCP23017 codec provider.

4.1. Linux driver[edit source]

Bindings: Documentation/devicetree/bindings/pinctrl/pinctrl-mcp23s08.txt

Sources: