RTOS/AM5746: How to reflect the Clock Tree Tool options

Rei,

Agree with the assessment that the clock tree for AM574x is complex and the Clock tree tool doesn`t automate incorporation of the modified clocks into board library as easily as pinmux changes so we are working on some improvements on the tool itself.  

Approach 1: Used when many clocks need to be changes or custom HW uses different input clock

• The tool allows you to create a register dump once the clock tree tool has been configured.
• Run the default settings from the idkAM574x GEL and use the GEL file in the folder TI_Clock_Tree_Tool\CTT-AM572x\Scripts  to capture the clock setting on AM57xx platform 
• Compare the settings from the tool and the idkAM574x GEL file to determine what registers need to be modified.
• Update the GEL file to test until the settings from tool and GEL matches.

The settings for PLL configuration and clock configuration in the board_pll.c and board_clock.c are directly obtained from the GEL file so apply the same settings for board as you applied to the GEL settings.

Approach 2: Used when only some DPLL or peripheral clocks need modification.

• Use clock tree controller View to isolate a clock that you need to modify as explained in CTT user guide section 1.8.1 
• Trace the multiplier and divider value you need to change to get to desired clock
• Update the multuplier and dividers for DPLL in GEL and board_pll.c
• Clock Mux changes can be done simply by writing to the registers.

This is bit of a manual process to apply the settings. For custom HW, you can minimize the changes to the clock settings.by using same CLKIN/OSCIN clock as evaluation platform. 

If you provide more details regarding your use case, we may be able to provide more guidance. 

Regards,

Rahul