Supporting Multi Function Devices - Alexandre Belloni





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Published on Nov 15, 2015

Some hardware blocks embedded on SoCs or some external peripherals don't expose one single functionality and so they don't fit in a single kernel subsystem. The Multifunction device (MFD) subsystem has been created to handle those devices and allows to register them in various other subsystems to handle each separate functionality. Quite often, the drivers then use the regmap API to abstract and multiplex register accesses through I2C, SPI or MMIO.
There is also a companion API, syscon which allows to create regmaps for registers composed of miscellaneous bits.
This talk will cover those three APIs and illustrate them with examples from existing drivers.

Alexandre Belloni

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