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Linux Device Drivers Development

Linux Device Drivers Development

By : John Madieu
4 (30)
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Linux Device Drivers Development

Linux Device Drivers Development

4 (30)
By: John Madieu

Overview of this book

Linux kernel is a complex, portable, modular and widely used piece of software, running on around 80% of servers and embedded systems in more than half of devices throughout the World. Device drivers play a critical role in how well a Linux system performs. As Linux has turned out to be one of the most popular operating systems used, the interest in developing proprietary device drivers is also increasing steadily. This book will initially help you understand the basics of drivers as well as prepare for the long journey through the Linux Kernel. This book then covers drivers development based on various Linux subsystems such as memory management, PWM, RTC, IIO, IRQ management, and so on. The book also offers a practical approach on direct memory access and network device drivers. By the end of this book, you will be comfortable with the concept of device driver development and will be in a position to write any device driver from scratch using the latest kernel version (v4.13 at the time of writing this book).
Table of Contents (23 chapters)
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1
Introduction to Kernel Development

DMA DT binding

DT binding for the DMA channel depends on the DMA controller node, which is SoC-dependent, and some parameters (such as DMA cells) may vary from one SoC to another. This example only focuses on the i.MX SDMA controller, which one can find in the kernel source, at Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt.

Consumer binding

According to the SDMA event-mapping table, the following code shows the DMA request signals for peripherals in i.MX 6Dual/ 6Quad:

uart1: serial@02020000 { 
    compatible = "fsl,imx6sx-uart", "fsl,imx21-uart"; 
    reg = <0x02020000 0x4000>; 
    interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>; 
    clocks = <&clks IMX6SX_CLK_UART_IPG>, ...

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