Hi,
I understand that you are setting CHIP_ANA_POWER to 0x6AFF, CHIP_DIG_POWER to 0x0073 and CHIP_LINREG_CTRL as 0x0008. But I think that the problem is that you are missing to set up the volume of the LINEOUT connected to the Speaker, the line output has a dedicated gain stage that can be used to adjust the output level. The CHIP_LINE_OUT_VOL controls the line level output gain. Please check Table 30, Table 31 and Table 32 from the datasheet for more details: https://www.nxp.com/docs/en/data-sheet/SGTL5000.pdf
The line outputs also have a dedicated mute that is controlled by the register field CHIP_ANA_CTRL- >MUTE_LO. Check out that LINEOUT mute is not enabled.
All outputs (LINEOUT, HP_OUT, I2S_OUT) are muted by default on power up.
Also, make sure that the route you are going to use is properly selected by your software.
There is a complete programming example about how to initialize and program the codec in the application note AN3663: https://www.nxp.com/docs/en/application-note/AN3663.pdf
Input/Output Routing software examples are in section 2.2.3
Have a great day,
Jose
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