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Petalinux, meta-adi-xilinx and device tree modifications of ADI nodes



		

			

									
					    mbush00
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 11, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Software
    
    		        		        		    		    	
			
    Can someone please tell me the proper method to modify ADI generated device tree nodes within PetaLinux?
    

    I am trying to build a BSP with support for the AD9986 (which uses the same driver as the 9081). I am using zynqmp-zcu102-rev10-ad9081-m8-l4 for KERNEL_DTB and I can see the nodes populated for a 9081. I have tried to put my modifications in system-user.dtsi to remove/modify the generated nodes, however it seems meta-adi-xilinx gets generated after my layer changes. So the end result is I don't see any changes.
    

    The layer readme (Link) talks about adding new (I assume non ADI nodes), but isn't clear on how to modify existing ones.
    

    I was able to make some changes by editing meta-adi-xilinx/recipies-bsp/device-tree/device-tree.bbappend but I would rather not have to edit that layer.
    

    

    Is there a better way to do this?
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on May 18, 2022 1:30 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      mbush00 said:
      The layer readme (Link) talks about adding new (I assume non ADI nodes), but isn't clear on how to modify existing ones.
      

      There's a clear section about this in extending-the-devicetree. So yes, your first approach is the correct one and it should work otherwise there might be some bug. Make sure you are properly modifying the nodes. Can you share the modifications you are trying to do so I can take a look?
      

      - Nuno Sá
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on May 18, 2022 2:22 PM
            
            
												
						in reply to nsa
					
									
        
	
        

		
		
        
					
        HI Nuno,
        

        Thanks for responding. I figured out my issue. I had two issues.
        

        

        1. I was not updating system-user.dtsi properly.
        

        2. There are times when running petalinux-build does not rebuild image.ub, so even though I made a change in the device tree that change wasn't reflected in my image.
        

        

        I haven't figured out a deterministic way to guarantee the device tree is the latest in image.ub, but modifying ADI device tree nodes does work.
        

        

        Thank you.
        

        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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