I would like to set the PWM and GPCLK pins to use the same clock source as the SPI bus uses, As mentioned by an answer to a previous question The PWM and GPCLK can be set to the following sources:

0      0 Hz     Ground
1      19.2 MHz oscillator
2      0 Hz     testdebug0
3      0 Hz     testdebug1
4      0 Hz     PLLA
5      1000 MHz PLLC (changes with overclock settings)
6      500 MHz  PLLD
7      216 MHz  HDMI auxiliary
8-15   0 Hz     Ground

Which one is it?

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