ad7606B，采集不了电压

Question

我使用imx6cpu，内核版本是6.1.22，以下是设备树，7606b挂载在spi1上： adc_vref : fixedregulator { compatible = " regulator-fixed " ; regulator-name = " adc_vref " ; regulator-min-microvolt = < 5000000 >; regulator-max-microvolt = < 5000000 >; // GPIO属性被移除，因为不需要通过GPIO控制电源 regulator-always-on; }; &ecspi1 { cs-gpios = <&gpio3 19 GPIO_ACTIVE_LOW >; pinctrl-names = " default " ; pinctrl-0 = <&pinctrl_ecspi1>; status = " okay " ; ad7606@0 { compatible = " adi,ad7606b " ; reg = < 0 >; spi-max-frequency = < 1000000 >; spi-cpol; // spi-cpha; //busy 4 24 //reset 4 22 //adi,conversion-start-gpios 4 23 //adi,first-data-gpios 4 25 //interrupt 4 21 avcc-supply = <&adc_vref>; //很重要，电源的重写可以规避识别不了的问题 interrupts = < 24 IRQ_TYPE_EDGE_FALLING >; //目前给的是busy信号 interrupt-parent = <&gpio4>; adi,conversion-start-gpios = <&gpio4 23 GPIO_ACTIVE_HIGH >; reset-gpios = <&gpio4 22 GPIO_ACTIVE_HIGH >; adi,first-data-gpios = <&gpio4 25 GPIO_ACTIVE_HIGH >; // adi,oversampling-ratio-gpios = <&gpio 18 GPIO_ACTIVE_HIGH // &gpio 23 GPIO_ACTIVE_HIGH // &gpio 26 GPIO_ACTIVE_HIGH>; // standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>; adi,sw-mode; // status = "okay"; }; }; 目前使用的中断管教给的是busy信号，不知道会不会有影响 // adi,oversampling-ratio-gpios = <&gpio 18 GPIO_ACTIVE_HIGH // &gpio 23 GPIO_ACTIVE_HIGH // &gpio 26 GPIO_ACTIVE_HIGH>; // standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>; 这几个管教因为硬件直接上拉了，所以设置不了。内核下打开7606的配置，目前可以在sys下看到设备： root@imx6q-custom:~# cd /sys/bus/iio/devices/iio\:device0 root@imx6q-custom:/sys/bus/iio/devices/iio:device0# ls -l drwxr-xr-x 2 root root 0 Mar 10 01:08 buffer drwxr-xr-x 2 root root 0 Mar 10 01:08 buffer0 -rw-r--r-- 1 root root 4096 Mar 10 01:08 current_timestamp_clock -r--r--r-- 1 root root 4096 Mar 10 01:08 dev -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage0_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage0_scale -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage1_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage1_scale -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage2_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage2_scale -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage3_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage3_scale -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage4_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage4_scale -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage5_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage5_scale -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage6_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage6_scale -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage7_raw -rw-r--r-- 1 root root 4096 Mar 10 01:08 in_voltage7_scale -r--r--r-- 1 root root 4096 Mar 10 01:08 in_voltage_scale_available -r--r--r-- 1 root root 4096 Mar 10 01:08 name lrwxrwxrwx 1 root root 0 Mar 10 01:08 of_node -> ../../../../../../../../../../firmware/devicetree/base/soc/bus@2000000/spba-bus@2000000/spi@2008000/ad7606@0 -rw-r--r-- 1 root root 4096 Mar 10 01:08 oversampling_ratio -r--r--r-- 1 root root 4096 Mar 10 01:08 oversampling_ratio_available drwxr-xr-x 2 root root 0 Mar 10 01:08 power drwxr-xr-x 2 root root 0 Mar 10 01:08 scan_elements lrwxrwxrwx 1 root root 0 Mar 10 01:08 subsystem -> ../../../../../../../../../../bus/iio drwxr-xr-x 2 root root 0 Mar 10 01:08 trigger -rw-r--r-- 1 root root 4096 Mar 10 01:07 uevent -r--r--r-- 1 root root 4096 Mar 10 01:08 waiting_for_supplier 但是我根据官方的文档，打开通道报如下错误： root@imx6q-custom:/sys/bus/iio/devices/iio:device0# cat in_voltage0_raw cat: read error: Input/output error 请帮我分析下，是设备树还有问题吗，还是需要一些初始化才能成功

FrankZhang · Accepted Answer

应该和你基于 imx6cpu重写的设备树配置有关，不过我手头上没有基于imx6cpu板子，暂时还不太能帮你检查出问题所在。)