phandle一种错误的用法及改正方法

（1）错误代码由于偷懒，直接把从别处拷贝的添加spi设备节点的代码直接拷贝放到了spi总线后面，如下：&soc {spi: spi@xxxxxxxx { compatible = "xxxx";#address-cells = <1>;#size-cells = <0>;};&spi {spidev@0 {compatible = "rohm,dh2228fv";spi-max-frequency = <0xf4240>;reg = <0x0>;};};}；结果编译报错：kernel/arch/arm/boot/dts/xxx/xxx.dtsi:23.1-7 syntax error经过修改验证，如下三种方法是正确的。(2)将&spi那段代码放到soc外面,如下：&soc {spi: spi@xxxxxxxx { compatible = "xxxx";#address-cells = <1>;#size-cells = <0>;};}；&spi {spidev@0 {compatible = "rohm,dh2228fv";spi-max-frequency = <0xf4240>;reg = <0x0>;};};(3)将spidev@0放到spi设备节点里面，如下&soc {spi: spi@xxxxxxxx { compatible = "xxxx";#address-cells = <1>;#size-cells = <0>;spidev@0 {compatible = "rohm,dh2228fv";spi-max-frequency = <0xf4240>;reg = <0x0>;};};}（4）指定设备节点，如下&soc {spi: spi@xxxxxxxx { compatible = "xxxx";#address-cells = <1>;#size-cells = <0>;};spi@xxxxxxxx {spidev@0 {compatible = "rohm,dh2228fv";spi-max-frequency = <0xf4240>;reg = <0x0>;};};}；至于为什么不能像（1）中那样使用，原因暂时不知，留待以后再查。