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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.

Speakers
avatar for Neil Armstrong

Neil Armstrong

Embedded Linux Engineer, BayLibre
Embedded Linux Engineer since 2008, Neil worked on designing and supporting small in-house designed SoCs for Digital TV Content Protection, Set-Top-Box or Security Co-Processor, and is now Embedded Linux Expert in the Baylibre team. He ports, maintains and upstreams Linux support... Read More →



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