How to use Linux DTS to optimize system performance?

Title: How to use Linux DTS to optimize system performance?

In Linux systems, Device Tree Source (DTS) is widely used to describe hardware device information, including peripherals, buses, interrupts, etc. By optimizing DTS, system performance and power consumption efficiency can be improved. This article will introduce how to leverage Linux DTS for optimization and provide some specific code examples.

1. Understanding DTS

DTS is a data structure that describes hardware device information. It usually uses .dts or .dtsi as the file extension. It describes the physical connection and attribute information of the hardware device, including the device name, address, register configuration, etc. The advantage of using DTS is that the hardware description can be separated from the kernel code, making it easier to understand and maintain.

2. Optimize DTS to improve system performance

1. Merge device nodes: Merge multiple similar device nodes into one node, which can reduce the size and parsing time of DTS and improve the system Startup efficiency. For example, combine sensors of the same model into one node.

Sample code:

sensor@100 {
    compatible = "vendor,sensor-a";
    reg = <0x100>;
    ...
};

sensor@200 {
    compatible = "vendor,sensor-a";
    reg = <0x200>;
    ...
};

After merge:

sensor@100 {
    compatible = "vendor,sensor-a";
    reg = <0x100 0x200>;
    ...
};

2. Use string attributes: avoid using a large number of numeric attributes in the device node, you can use characters String attributes instead, which are more readable and easier to maintain.

Sample code:

gpio-controller {
    #gpio-cells = <2>;
    gpio-controller,gpios = <&gpio1 18 GPIO_ACTIVE_LOW>,
                            <&gpio2 13 GPIO_ACTIVE_HIGH>;
};

After improvement:

gpio-controller {
    gpio-cells = <2>;
    gpio-controller,pins = "gpio1_18", "gpio2_13";
};

3. Avoid repeated description of hardware information: Try to avoid repeated description of the same information in different nodes in DTS Hardware information can be extracted into a common node.

Sample code:

spi@1234 {
    compatible = "vendor,spi";
    ...
};

i2c@5678 {
    compatible = "vendor,i2c";
    ...
};

cs-gpio {
    compatible = "vendor,gpio";
    gpio-controller;
    #gpio-cells = <2>;
    ...
};

Improved:

gpio-controller {
    gpio-cells = <2>;
    ...
};

spi@1234 {
    compatible = "vendor,spi";
    ...
    cs-gpios = <&gpio-controller 1 2>;
};

i2c@5678 {
    compatible = "vendor,i2c";
    ...
    sda-gpios = <&gpio-controller 3>;
    scl-gpios = <&gpio-controller 4>;
};

4. Use include statement: store some common hardware description information in a separate file, And introduced through the include statement, it can improve the readability and maintainability of the code.

Sample code:
common.dtsi:

/include/ "common.dtsi"

mcu: microcontroller {
    compatible = "vendor,mcu";
    ...
};

board.dts:

#include "common.dtsi"

board: mainboard {
    compatible = "vendor,board";
    ...
};

5. Good comments: add detail and clarity in DTS Annotations make it easier to read and understand hardware information and avoid confusion and errors.

Through the above optimization methods, system performance can be improved and power consumption reduced, while making the code easier to maintain and expand.

Summary

By optimizing Linux DTS, system performance can be improved and power consumption reduced. The keys to optimization are merging device nodes, using string attributes, avoiding repeated descriptions of hardware information, using include statements, and adding good comments. These optimization methods not only improve system efficiency, but also increase code readability and maintainability, which are beneficial to the stable operation, development and maintenance of the system.

I hope this article can help readers better understand and use Linux DTS to optimize system performance and improve the overall performance and user experience of the system.

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