Linux Driver Development with Raspberry Pi - Linux SPI Subsystem : LDD with Raspberry Pi #17

In this video, we explore the Linux SPI subsystem inside the Linux kernel and build a minimal SPI client driver from scratch. Instead of jumping directly into Device Tree-based driver development, we first focus on understanding the internal architecture of SPI in Linux — how drivers are registered, how devices are matched, how probe() is triggered, and how SPI data transfers work using spi_message and spi_transfer. To demonstrate full-duplex SPI communication, we: * Use the Raspberry Pi SPI0 controller as the master * Use an ESP32 Dev Board as the SPI slave * Manually bind and unbind the SPI device to our custom driver * Perform a full-duplex SPI transfer using spi_sync() * Observe probe() and remove() lifecycle behavior This example is purely educational and focuses on understanding how the SPI subsystem works inside the kernel. Github :- https://github.com/madhawapolkotuwa/linux_driver_development_with_raspberrypi ☕Buy me a Coffee : https://buymeacoffee.com/madhawapolb