September 27-30, 2021
Seattle, Washington, USA + Virtual
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Monday, September 27 • 11:15am - 12:05pm
(VIRTUAL) Introduction to Pin Muxing and GPIO Control Under Linux - Neil Armstrong, BayLibre

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In the last 10 years, the GPIO and PINCTRL subsystem matured to support almost every possible handling of Programmable Input/Outputs and more generally multiplexing of multiple functions on single "Pins" or group of "Pins". However, what is a "Pin"? What is a multiplexed "Function"? How programmable I/Os and pin functions are designed on the majority of System-On-Chips? Neil will describe this from the Hardware design Point-Of-View, the constraints and the requirements. Then Neil will explain how this particular subject was handled over the years in the Linux kernel, to finally get to the current GPIO & PINCTRL subsystems, and how it articulates with the Device Tree and other Firmware based protocols.

Monday September 27, 2021 11:15am - 12:05pm PDT
MeetingPlay Platform + Virtual Learning Lab