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The GPIO subsystem is one of the oldest driver abstraction layers in the linux kernel. First, somewhat unified GPIO interfaces appeared around 20 years ago. Over the years it has become one of the most ubiquitous subsystems in embedded linux as GPIOs are used universally by all kinds of devices for a multitude of more, less or not-at-all standardized functions. Over the years GPIOLIB has become its own, self-contained library, was integrated into the driver model and acquired many new features (device-tree and ACPI support, GPIO irqchips, plug-and-play) but it came at a cost. The subsystem was hit especially hard by ARM fragmentation, the fallout of which is still visible in countless board files containing suboptimal code we need to maintain. We eventually ended up with two in-kernel APIs, two uAPI variants, complex glue code to pinctrl and interrupt subsystems as well as piles upon piles of quirks and corner-cases. Efforts to improve the situation have been ongoing and have picked up in 2023/2024. This talk will cover how we try to improve serialization, hot-pluggability and reduce the API abuse treewide while dancing carefully around existing legacy users.
Bartosz Golaszewski has over 16 years of engineering experience in the embedded systems domain ranging from low-level, real-time operating systems, through the linux kernel up to user-space plumbing, libraries and build systems. Bartosz has contributed hundreds of patches to a wide... Read More →
