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ADRV9009 Recommended for New Designs
The ADRV9009 is a highly integrated, radio frequency (RF), agile transceiver offering dual transmitters and receivers, integrated synthesizers, and digital...
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ADRV9009 on Analog.com

HMC7044 Recommended for New Designs
The HMC7044 is a high performance, dual-loop, integer-N jitter attenuator capable of performing reference selection and generation of ultralow phase noise...
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HMC7044 on Analog.com

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ADRV9009 IIO driver with no direct control of HMC7044



		

			

									
					    RomainH
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 15, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Software
    
    		        		        		    		    	
			
    Hello,
    In our design, two ADRV9009 are connected to a Zynq Ultrascale MPSOC (transceiver lanes and SPI configuration interfaces), and those chips are clocked by a HMC7044 chip for which the configuration interface is connected to a separate processor (i.e. not connected to the MPSoC).

    Is it still possible to use the Linux IIO ADR9009 driver to configure the ADRV9009 ?
    If so, what would be the necessary updates to the driver ? How should the device tree look like ? 


    Thank you.
    Best regards,
    Romain 
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Nov 15, 2023 7:31 AM
            
            
					
      
	
      

		
		
      
					
      Hi Romain,
      

      

      The Linux IIO driver doesn't depend on a particular clock chip.
      

      We have a few clock chip drivers that interoperate with our jesd204-fsm kernel framework.
      

      

      The HMC7044 actually supports SPI write only.
      

      So you can pretend that it's there while it's actually not.
      

      So if your external clockchip is programmed correctly the system may come up.
      

      I would take a look at the FMCOMMS8 device trees: 
      

      https://github.com/analogdevicesinc/linux/blob/master/arch/arm64/boot/dts/xilinx/adi-fmcomms8.dtsi
      

      

      You say you have to AD9009s, so I assume you need to sync them?
      

      Here is the more complicated part.
      

      ADRV9009 multichip and phase sync require some distinct SYSREF pulses.
      

      So you need some SYSREF request control from the MPSoC to the HMC7044 (via GPIO) or to the controller which sets up the HMC7044.
      

      

      -Michael
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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