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怎么查看Linux I2C总线挂载了那些设备？

news 2025/8/9 7:23:43

1. 根据系统启动查看设备树节点文件（系统运行后的）

比如：要查看I2C2

	i2c2: i2c@feaa0000 {compatible = "rockchip,rk3588-i2c", "rockchip,rk3399-i2c";reg = <0x0 0xfeaa0000 0x0 0x1000>;clocks = <&cru CLK_I2C2>, <&cru PCLK_I2C2>;clock-names = "i2c", "pclk";interrupts = <GIC_SPI 319 IRQ_TYPE_LEVEL_HIGH>;pinctrl-names = "default";pinctrl-0 = <&i2c2m0_xfer>;resets = <&cru SRST_I2C2>, <&cru SRST_P_I2C2>;reset-names = "i2c", "apb";#address-cells = <1>;#size-cells = <0>;status = "disabled";};

在这里插入图片描述

综上所述，节点名称是i2c@feaa0000

cd /proc/device-tree/i2c@feaa0000 ,进入这个目录 ls查看

2. 反编译总的设备树文件来查询

dtc -I dtb -O dts rk3588s-evb1-lp4x-v10-linux.dtb > test_all.dts

执行这个指令 grep -A10 “i2c2” test_all.dts
结果如下

wls@wls-virtual-machine:~/manifoldtech_file/project/RK3588/rk3588_linux_241112/kernel/arch/arm64/boot/dts/rockchip$ grep -A10 "i2c2" test_all.dtsi2c2 = "/i2c@feaa0000";i2c3 = "/i2c@feab0000";i2c4 = "/i2c@feac0000";i2c5 = "/i2c@fead0000";i2c6 = "/i2c@fec80000";i2c7 = "/i2c@fec90000";i2c8 = "/i2c@feca0000";rkcif_mipi_lvds0 = "/rkcif-mipi-lvds";rkcif_mipi_lvds1 = "/rkcif-mipi-lvds1";rkcif_mipi_lvds2 = "/rkcif-mipi-lvds2";rkcif_mipi_lvds3 = "/rkcif-mipi-lvds3";
--i2c2 {i2c2m0-xfer {rockchip,pins = <0x00 0x0f 0x09 0x19d 0x00 0x10 0x09 0x19d>;phandle = <0x143>;};i2c2m2-xfer {rockchip,pins = <0x02 0x03 0x09 0x19d 0x02 0x02 0x09 0x19d>;phandle = <0x341>;};i2c2m3-xfer {rockchip,pins = <0x01 0x15 0x09 0x19d 0x01 0x14 0x09 0x19d>;phandle = <0x342>;};i2c2m4-xfer {rockchip,pins = <0x01 0x01 0x09 0x19d 0x01 0x00 0x09 0x19d>;phandle = <0x343>;};};i2c3 {i2c3m0-xfer {rockchip,pins = <0x01 0x11 0x09 0x19d 0x01 0x10 0x09 0x19d>;phandle = <0x150>;
--i2c2 = "/i2c@feaa0000";vdd_npu_s0 = "/i2c@feaa0000/rk8602@42";vdd_npu_mem_s0 = "/i2c@feaa0000/rk8602@42";aw2013_led = "/i2c@feaa0000/aw2013_led@45";imu_icm_45686 = "/i2c@feaa0000/imu_icm_45686@69";usbc0 = "/i2c@feaa0000/fusb301@25";usbc0_role_sw = "/i2c@feaa0000/fusb301@25/ports/port@0/endpoint@0";usb_con = "/i2c@feaa0000/fusb301@25/connector";usbc0_orien_sw = "/i2c@feaa0000/fusb301@25/connector/ports/port@0/endpoint";dp_altmode_mux = "/i2c@feaa0000/fusb301@25/connector/ports/port@1/endpoint";og02b10_1 = "/i2c@feaa0000/og02b10-1@70";
--i2c2m0_xfer = "/pinctrl/i2c2/i2c2m0-xfer";i2c2m2_xfer = "/pinctrl/i2c2/i2c2m2-xfer";i2c2m3_xfer = "/pinctrl/i2c2/i2c2m3-xfer";i2c2m4_xfer = "/pinctrl/i2c2/i2c2m4-xfer";i2c3m0_xfer = "/pinctrl/i2c3/i2c3m0-xfer";i2c3m1_xfer = "/pinctrl/i2c3/i2c3m1-xfer";i2c3m2_xfer = "/pinctrl/i2c3/i2c3m2-xfer";i2c3m4_xfer = "/pinctrl/i2c3/i2c3m4-xfer";i2c4m0_xfer = "/pinctrl/i2c4/i2c4m0-xfer";i2c4m2_xfer = "/pinctrl/i2c4/i2c4m2-xfer";i2c4m3_xfer = "/pinctrl/i2c4/i2c4m3-xfer";i2c4m4_xfer = "/pinctrl/i2c4/i2c4m4-xfer";i2c5m0_xfer = "/pinctrl/i2c5/i2c5m0-xfer";i2c5m1_xfer = "/pinctrl/i2c5/i2c5m1-xfer";