Category:Dtb

Example

/{                                  //根节点
    node1{                          //node1是节点名，是/的子节点
        key=value;                  //node1的属性
        ...
        node2{                      //node2是node1的子节点
            key=value;              //node2的属性
            ...
        }
    }                               //node1的描述到此为止
    node3{
        key=value;
        ...
    }
}

Check

• /sys/firmware/devicetree

DTS

Config device tree file

• Config device tree file , no need change default： nano arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts

for SPI Flash, add node

&spi0 {
       status ="okay";

       mx25l25635e:mx25l25635e@0 {
               compatible = "jedec,spi-nor";
               reg = <0x0>;
               spi-max-frequency = <50000000>;
               #address-cells = <1>;
               #size-cells = <1>;
       };

};

Compile

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16 INSTALL_MOD_PATH=out modules
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16 INSTALL_MOD_PATH=out modules_install

Or

kernel -> make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j4
devie three compiler -> make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- dtbs

DTS

• make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- dtbs -j4

Peripheral Use

• UART
• PWM
• IIC
• Codec
• Ethernet

REF

• https://licheezero.readthedocs.io/zh/latest/%E9%A9%B1%E5%8A%A8/Device_Tree_Intro.html
• https://www.cnblogs.com/xiaojiang1025/p/6131381.html
• http://e76103db.wiz03.com/share/s/3Dogfr2DXA6Q27Og6x2QoKY92Bk9at14FABh21OAAE28lAme