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AWR2944: why do we use rlDeviceSetHsiClk for AWR2944

Part Number: AWR2944
Other Parts Discussed in Thread: AWR2243

Hi Team,

When we initialize mmwave link for AWR294, MMWave_openLink()->rlDeviceSetHsiClk() is called.  In my understanding HSI clock (like LVDS) of AWR2944 should be set by configuring clock mux (HSI_CLK_GCM_CLKSRC_SEL) instead of sending message to BSS via mailbox.  Could you pls help explain why do we need to add this API here?   

Thanks 

Ken