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Interdependent clock source/clock frequency configuration #3011

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Interdependent clock source/clock frequency configuration #3011

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@bugadani bugadani commented Jan 21, 2025 •
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This PR implements my idea for #1668

Currently the PR contains implementations for

  • SPI: this one caches the calculated register (so this closes Changing SPI clock is unexpectedly expensive #1666) value due to the calculation being expensive. Currently a single clock source exists, which IIRC is stable, but we have the option to not mark it so.
  • UART/I2C: these do not pre-calculate the register value, but group the clock source together with the baud rate. This is done for consistency, and the future possibility to pre-calculate, just in case. I2C does not yet have a clock source option, but there are chips that have the hardware support (S3 for example).

@bugadani bugadani force-pushed the clk_source branch 10 times, most recently from 473975b to 1656e54 Compare January 23, 2025 15:32
@bugadani bugadani marked this pull request as ready for review January 24, 2025 16:18
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Changing SPI clock is unexpectedly expensive
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