Implementing ACPI 5 Features Device Enumeration and PM
summary
ACPI 5 adds explicit GPIO and SPB resource types (SPI/I2C/UART) that CRS methods return; kernel code in v3.8 parses those resources, creates platform_device or PCI controller objects, and instantiates child devices by building struct spi/i2c client objects from the connection descriptors. Drivers bind by matching ACPI IDs so existing platform drivers can be reused (reuse existing platform drivers). GPIO interrupts map to ACPI events and a new ACPI PM domain handles runtime and system suspend using PSx methods and power resources.
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chapters (19)
- 0:00Intro
- 0:40What is ACPI
- 8:32ACPI ICA
- 11:29ACPI 5 Features
- 13:04GPIO abstraction
- 20:32Peripherals
- 21:14Controllers
- 24:15Reuse Drivers
- 28:34SPI Enumeration
- 30:47SPI Connection Resource
- 33:06SPI Driver
- 33:53I Square C Driver
- 35:08SPI Procedure
- 39:19GPIO Procedure
- 41:09Power Management
- 41:50Power Management Overview
- 48:00Power Domain
- 50:16Demo
- 52:58Summary
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