mt7688 openwrt dts 文件解释
/dts-v1/;
/include/ "mt7628an.dtsi"
/ { //根节点
compatible = "widora", "mediatek,mt7628an-soc"; //板子
model = "WIDORA-NEO"; //
chosen { //通过dts 内核传给uboot的bootargs参数
bootargs = "console=ttyS0,115200"; // 控制台 uart0
};
memory@0 { //memory 节点
device_type = "memory"; //
reg = <0x0 0x8000000>; //Memory 起始地址 0x00，长度0x8000000
};
#arch/mips/ralink/mt7620.c
static struct rt2880_pmx_group mt7628an_pinmux_data[]
pinctrl { //管脚配置，mt7620.c
state_default: pinctrl0 { //
gpio { //
ralink,group = "gpio"; //
ralink,function = "gpio"; //
};
perst { //
ralink,group = "perst"; //
ralink,function = "gpio"; //
};
refclk { //
ralink,group = "refclk"; //
ralink,function = "gpio"; //
};
i2s { //
ralink,group = "i2s"; //
ralink,function = "i2s"; //
};
spis { //
ralink,group = "spis"; //
ralink,function = "gpio"; //
};
wled_an {
ralink,group = "wled_an";
ralink,function = "wled_an";
};
ephy_p1 {
ralink,group = "ephy_p1";
ralink,function = "gpio";
};
ephy_p2 {
ralink,group = "ephy_p2";
ralink,function = "gpio";
};
ephy_p3 {
ralink,group = "ephy_p3";
ralink,function = "gpio";
};
ephy_p4 {
ralink,group = "ephy_p4";
ralink,function = "gpio";
};
wdt {
ralink,group = "wdt";
ralink,function = "gpio";
};
};
};
palmbus@10000000 { //片内总线，类似arm的amba，0x10000000---0x100000ff sysctl
spi@b00 { //
status = "okay"; //
pinctrl-names = "default"; //
pinctrl-0 = <&spi_pins>, <&spi_cs1_pins>; //
m25p80@0 { //0x10000B00--0x10000BFF SPI master
#address-cells = <1>; //
#size-cells = <1>; //
compatible = "w25q256"; //
reg = <0 0>; //
linux,modalias = "m25p80", "w25q256"; //
spi-max-frequency = <40000000>; //
m25p,chunked-io = <31>; //
partition@0 { //u-boot分区，第一个分区,偏移地址 0x0
label = "u-boot"; //u-boot分区
reg = <0x0 0x30000>; //起始地址0x0，长度 0x30000
read-only; //属性,只读
};
partition@30000 { //第二分区，u-boot-env 环境变量
label = "u-boot-env"; //u-boot-env 环境变量
reg = <0x30000 0x10000>; //起始地址0x30000，长度 0x10000
};
factory: partition@40000 { //第三分区，偏移地址 0x40000
label = "factory"; //wifi校准参数
reg = <0x40000 0x10000>; //起始地址0x40000，长度 0x10000
};
partition@50000 { //第四分区，偏移地址 0x50000
label = "firmware"; //固件程序
reg = <0x50000 0x1fb0000>; //起始地址0x50000，长度 0x1fb0000
};
};
spidev@1 { //第二个spi设备
#address-cells = <1>; //表示地址空间的个数
#size-cells = <1>; //表示地址空间所需的字节数
compatible = "spidev"; //static struct platform_driverXXXX_driver 匹配
reg = <1 0>; //
spi-max-frequency = <40000000>; //spi 频率是400K
};
};
i2c@900 { //I2C 寄存器地址范围0x10000900-0x100009FF,看编程手册
status = "okay"; //okay 编译进内核
};
uart1@d00 { //UART1=UARTLITE2 寄存器地址范围0x10000d00-0x10000dFF,看编程手册
status = "okay"; //okay 编译进内核
};
uart2@e00 { //UART2=UARTLITE3 寄存器地址范围0x10000E00-0x10000EFF,看编程手册
status = "okay"; //okay 编译进内核
};
pwm@5000 { // PWM 寄存器地址范围0x10005000-0x10005FFF,看编程手册
status = "okay"; //okay 编译进内核
};
};
ethernet@10100000 { //ethernet寄存器地址范围0x10100000-0x1010FFFF,看编程手册
mtd-mac-address = <&factory 0x28>; //在factory分区的偏移地址0x28 对应是lan mac 地址
};
sdhci@10130000 { //SDXC/eMMC 寄存器范围0x10130000-0x10137FFF
status = "okay"; //okay 编译进内核
mediatek,cd-low; //
};
gpio-keys-polled { //
#在目录 /package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c 匹配platform_xxx结构体的 .name 字段
compatible = "gpio-keys-polled"; //static struct platform_driverXXXX_driver 匹配
#address-cells = <1>; //
#size-cells = <0>; //
poll-interval = <20>; //查询间隔 20ms
wps { //wps健
label = "reset"; //
gpios = <&gpio1 6 1>; // gpio1 is GPIO32--GPIO63，WPS=GPIO38 is gpio1 +6，平时为高,即低电平有效
linux,code = <0x211>; //
};
};
};