AD9361 (re)-initialization from linux

Question

Hi, 
 i wanted to know if there is a way to "re-initialize" the AD9361 from linux userspace with the libiio driver? With no-os driver this seems to be possible, but i did not found any solution so far from linux. I can trigger the resetb from gpio drivers but then i need to reconfigure/re-initialize the device, in best case like it is done in the no-os init function. 
 If there is no solution available so far, is it possible to compile the no-os init programm to a linux executeable? (out of SDK for example) 
 Thanks and kindly regards 
 Jan

mhennerich · Accepted Answer

Please see here: Runtime Device Driver Customization 
 There is a file in debugfs (initialize) which allows you to reinitialized the device from reset. 
 You can also unbind and rebind the driver from sysfs. 
 -Michael)

asvillamar · Answer

I found a solution that works for me on the zed board using the fmcomms2 project. For other boards it is probably a very similar process. I needed to unbind and then rebind certain drivers to re-initialize the AD9361. Here are the commands I ran: echo 79020000.cf-ad9361-lpc > /sys/bus/platform/drivers/cf_axi_adc/unbind echo 79024000.cf-ad9361-dds-core-lpc > /sys/bus/platform/drivers/cf_axi_dds/unbind echo 7c400000.dma > /sys/bus/platform/drivers/dma-axi-dmac/unbind echo 7c420000.dma > /sys/bus/platform/drivers/dma-axi-dmac/unbind # PerformFPGA update (fpgautil -b bit.bin) echo 7c400000.dma > /sys/bus/platform/drivers/dma-axi-dmac/bind echo 7c420000.dma > /sys/bus/platform/drivers/dma-axi-dmac/bind echo 79024000.cf-ad9361-dds-core-lpc > /sys/bus/platform/drivers/cf_axi_dds/bind echo 79020000.cf-ad9361-lpc > /sys/bus/platform/drivers/cf_axi_adc/bind After doing it like this I have a new FPGA image and I can continue to use the AD9361 for transmission ( i am not using for RX and have not tested). I needed to do it in this specific order to get it to work properly. I am not sure on other platforms if the exact same commands will work but the idea is similar. There might be more drivers I need to unbind and rebind in case anything else got into a bad state during FPGA update, but I will find those out soon enough.

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AD9361 (re)-initialization from linux