Unable to detect axi-core-tdd iio device

Question

Hello, 
 Greeting! 
 I build the BOOT.BIN from the newest hdl_2022_r2. I try two projects: one is hdl/projects/ad9081_fmca_ebz_x_band/zcu102/; the other is projects/ad9081_fmca_ebz/zcu102. When I use ZCU102 and AD9081 to test firmware, the axi-core-tdd device cannot be detected. 
 The result of "iio_attr -d" of project ad9081_fmca_ebz_x_band is as follows: root@analog:~# iio_attr -d
IIO context has 39 devices:
 hwmon0, ina226: found 2 device attributes
 hwmon1, ina226: found 2 device attributes
 hwmon10, ina226: found 2 device attributes
 hwmon11, ina226: found 2 device attributes
 hwmon12, ina226: found 2 device attributes
 hwmon13, ina226: found 2 device attributes
 hwmon14, ina226: found 2 device attributes
 hwmon15, ina226: found 2 device attributes
 hwmon16, ina226: found 2 device attributes
 hwmon17, ina226: found 2 device attributes
 hwmon18, max20751: found 0 device attributes
 hwmon19, max20751: found 0 device attributes
 hwmon2, ina226: found 2 device attributes
 hwmon20, ltc2992: found 0 device attributes
 hwmon3, ina226: found 2 device attributes
 hwmon4, ina226: found 2 device attributes
 hwmon5, ina226: found 2 device attributes
 hwmon6, ina226: found 2 device attributes
 hwmon7, ina226: found 2 device attributes
 hwmon8, ina226: found 2 device attributes
 hwmon9, ina226: found 2 device attributes
 iio:device0, ltc2314-14: found 1 device attributes
 iio:device1, ams: found 1 device attributes
 iio:device18, adf4371-0: found 2 device attributes
 iio:device19, hmc7044: found 7 device attributes
 iio:device2, adar1000_csb_1_1: found 39 device attributes
 iio:device20, stingray_control: found 0 device attributes
 iio:device21, xud_control: found 0 device attributes
 iio:device22, imu_control: found 0 device attributes
 iio:device23, axi-ad9081-rx-hpc: found 13 device attributes
 iio:device24, axi-ad9081-tx-hpc: found 2 device attributes
 iio:device3, adar1000_csb_1_2: found 39 device attributes
 iio:device4, adar1000_csb_1_3: found 39 device attributes
 iio:device5, adar1000_csb_1_4: found 39 device attributes
 iio:device6, adar1000_csb_2_1: found 39 device attributes
 iio:device7, adar1000_csb_2_2: found 39 device attributes
 iio:device8, adar1000_csb_2_3: found 39 device attributes
 iio:device9, adar1000_csb_2_4: found 39 device attributes
 iio_sysfs_trigger: found 2 device attributes
 
 The result of "iio_attr -d" of project ad9081_fmca_ebz is as follows: 
 root@analog:~# iio_attr -d
IIO context has 25 devices:
 hwmon0, ina226-u76: found 2 device attributes
 hwmon1, ina226-u77: found 2 device attributes
 hwmon10, ina226-u79: found 2 device attributes
 hwmon11, ina226-u81: found 2 device attributes
 hwmon12, ina226-u80: found 2 device attributes
 hwmon13, ina226-u84: found 2 device attributes
 hwmon14, ina226-u16: found 2 device attributes
 hwmon15, ina226-u65: found 2 device attributes
 hwmon16, ina226-u74: found 2 device attributes
 hwmon17, ina226-u75: found 2 device attributes
 hwmon18, max20751: found 0 device attributes
 hwmon19, max20751: found 0 device attributes
 hwmon2, ina226-u78: found 2 device attributes
 hwmon3, ina226-u87: found 2 device attributes
 hwmon4, ina226-u85: found 2 device attributes
 hwmon5, ina226-u86: found 2 device attributes
 hwmon6, ina226-u93: found 2 device attributes
 hwmon7, ina226-u88: found 2 device attributes
 hwmon8, ina226-u15: found 2 device attributes
 hwmon9, ina226-u92: found 2 device attributes
 iio:device0, xilinx-ams: found 1 device attributes
 iio:device1, hmc7044: found 8 device attributes
 iio:device2, axi-ad9081-rx-hpc: found 14 device attributes
 iio:device3, axi-ad9081-tx-hpc: found 3 device attributes
 iio_sysfs_trigger: found 2 device attributes
 
 Do you have any idea about this problem? Thanks, 
 Dongyu

rnechita · Accepted Answer

Hello, My colleague tested out the devicetree and we figured out why you couldn't see the device with iio_attr. Previously, the tdd driver was an iio driver but after the last update it was moved in misc, and in order to have the device show up in iio you also need to add it as a iio- fake-platform-device . She created a branch with the necessary modifications for your dts, and we tested it out and the device shows up and the attributed can be read/written. If you build the dtb from this branch: https://github.com/analogdevicesinc/linux/blob/staging/fix-tdd-dts/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-rev10-ad9081-m8-l4-tdd.dts#L33 , you should also have the device available. Please let us know if you run into any other issues. Thank you, Ramona)

rnechita · Answer

Hello, Which Linux branch/devicetree are you using? If you are using the 2022_R2 branch, there have been some recent updates to the driver, you might need to change the compatible name in the devicetree, as it is shown here: https://github.com/analogdevicesinc/linux/blob/2022_R2/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-rev10-tdd.dts#L37 Thanks, Ramona

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Unable to detect axi-core-tdd iio device

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