Question

我正在尝试在Raspberry Pi 3的SPI上添加2个TI的CC2520芯片，该芯片具有2个spi芯片选择引脚。但是，我只能在芯片选择0或1上添加一个芯片，但不能同时添加两个芯片。

在bcm2709-rpi-2-b.dts的末尾添加以下内容，我可以看到＆＃34; wpan0＆＃34;以太网接口＆＃34; ifconfig＆＃34;

&spi0 {
status="okay";
spidev@0{
    status = "disabled";
};
spidev@1{
    status = "disabled";
};
cc2520@0 {
    compatible = "ti,cc2520";
    reg = <0>;
    spi-max-frequency = <4000000>;
    fifo-gpio = <&gpio 24 1>;
    fifop-gpio = <&gpio 17 1>;
    sfd-gpio = <&gpio 4 1>;
    cca-gpio = <&gpio 23 1>;
    vreg-gpio = <&gpio 26 1>;  /*LED*/
    reset-gpio = <&gpio 25 1>;  /*connected to two 2520*/
};

这个也有效

&spi0 {
status="okay";
spidev@0{
    status = "disabled";
};
spidev@1{
    status = "disabled";
};
cc2520@1 {
    compatible = "ti,cc2520";
    reg = <1>;
    spi-max-frequency = <4000000>;
    fifo-gpio = <&gpio 12 1>;
    fifop-gpio = <&gpio 6 1>;
    sfd-gpio = <&gpio 5 1>;
    cca-gpio = <&gpio 16 1>;
    vreg-gpio = <&gpio 19 1>;  /*IO5 actually, it is input*/
    reset-gpio = <&gpio 18 1>;  /*just a NC pin*/
};

但是添加以下节点，我的Linux无法启动。 RPI3卡在初始彩色屏幕上

&spi0 {
status="okay";
spidev@0{
    status = "disabled";
};
spidev@1{
    status = "disabled";
};
cc2520@0 {
    compatible = "ti,cc2520";
    reg = <0>;
    spi-max-frequency = <4000000>;
    fifo-gpio = <&gpio 24 1>;
    fifop-gpio = <&gpio 17 1>;
    sfd-gpio = <&gpio 4 1>;
    cca-gpio = <&gpio 23 1>;
    vreg-gpio = <&gpio 26 1>;  /*LED*/
    reset-gpio = <&gpio 25 1>;  /*connected to two 2520*/
};
cc2520@1 {
    compatible = "ti,cc2520";
    reg = <1>;
    spi-max-frequency = <4000000>;
    fifo-gpio = <&gpio 12 1>;
    fifop-gpio = <&gpio 6 1>;
    sfd-gpio = <&gpio 5 1>;
    cca-gpio = <&gpio 16 1>;
    vreg-gpio = <&gpio 19 1>;  /*IO5 actually, it is input*/
    reset-gpio = <&gpio 18 1>;  /*just a NC pin*/
};

我已经尝试将一个CC2520节点替换为某个ATMEL芯片，尽管我还没有。但是设备树根本不允许2个芯片出现在1个spi总线上。有什么想法吗？

谢谢，艾伦

设备树 - 如何在1 spi总线上添加2个spi芯片？

0 个答案: