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J. Nick Koston
41e09c1e6c
Extend interrupt_pin support to MCP23008, MCP23017, MCP23S08, MCP23S17, and PI4IOE5V6408 GPIO expander components. Same approach as PCF8574/PCA9554: when configured, the component disables its loop and only wakes on interrupt, and the cache stays valid between interrupts so binary sensors return from cache instead of doing I2C/SPI reads every loop iteration. For MCP23xxx, the interrupt_pin config and C++ logic lives in the shared MCP23XXXBase template class, so all four variants (I2C 8/16-pin, SPI 8/16-pin) inherit it automatically. Inspired by jesserockz's work in #11959 which proposed a more comprehensive interrupt-driven approach with per-pin interrupt status register reading. This implementation takes a simpler path by leveraging the existing CachedGpioExpander cache invalidation mechanism.
