pcf8574: driver for 8-pin quasi-bidirectional GPIO over I2C(cherry picked from commit 6354154ef520d359492badf0de9c8ae5d7080ae7)
Add TCA6416 GPIO expander support.Add basic TCA6416 GPIO expander support over I2C bus. The driver handlesenabling and disabling pins, setting pin mode to IN and OUT andtoggling the pins. Externa
Add TCA6416 GPIO expander support.Add basic TCA6416 GPIO expander support over I2C bus. The driver handlesenabling and disabling pins, setting pin mode to IN and OUT andtoggling the pins. External interrupts are not supported.Submitted by: Dawid Gorecki <[email protected]>Reviewed by: manu, mmelObtained from: SemihalfSponsored by: Alstom GroupDifferential Revision: https://reviews.freebsd.org/D24363
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