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April 16-18, 2024
Seattle, Washington
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Wednesday, April 17 • 4:55pm - 5:35pm
Sharing Reset GPIOs in the Linux Kernel - Krzysztof Kozlowski, Linaro

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The Linux kernel GPIO framework allows sharing GPIOs between multiple devices, however it does not provide any further abstractions when such devices set GPIO to conflicting states. This is quite a common case for devices being on the same bus and sharing the reset or shutdown GPIOs. If one device goes to sleep first, should it or should it not assert the reset line, knowing that the other device might be still operating?

The talk will present existing approaches to solve this problem, like regulators and reset framework, and on-going work of handling this via GPIOs.

Speakers
avatar for Krzysztof Kozlowski

Krzysztof Kozlowski

Linux Kernel Maintainer, Linaro
Krzysztof Kozlowski is an active Linux Kernel developer, working currently for Linaro on upstream development of Qualcomm ARM/ARM64 SoCs. Krzysztof maintains several upstream kernel subsystems: Devicetree bindings (as a co-maintainer with Rob and Conor), Memory controller drivers... Read More →



Wednesday April 17, 2024 4:55pm - 5:35pm PDT
343-344 (Level 3)
  LinuxCon
  • Content Experience Level Advanced
  • Session Slides Attached Yes
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