SPI clock speed is tied to system clock so for example of the system clock changes the SPI changes. To prevent this you need to prevent power scaling/fix the frequency.
Is this also the case for I2C on P4?
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What is a P84? Where did you get this misinformation? – Milliways Jan 30 '24 at 21:26
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Does this answer your question? What is Rpi's I2C Maximum Speed? – Seamus Jan 30 '24 at 23:43
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Not as that I can tell since I didn't see them talking about if a system clock impacted I2C speed. – FourierFlux Jan 31 '24 at 01:43