[riot-notifications] [RIOT-OS/RIOT] cpu/stm32: model MCO clock configuration in kconfig (#15706)

Alexandre Abadie notifications at github.com
Tue Jan 5 12:05:31 CET 2021

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Therefore, before describing what your contribution is about, we would like
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### Contribution description

This PR adds a Kconfig configuration for the MCO (MCU Clock Output) of some STM32 families (F0/F1/F3/G0/G4/L0/L1/L4/WB). F2/F4/F7 families are not addressed by this PR because there clock configuration is not yet modeled in Kconfig (see #15632) and they provide 2 MCO outputs.

To support the fact that f1 and some f0 and f3 don't provide an MCO prescaler, the `CLOCK_HAS_NO_MCO_PRE` config is introduced and selected in the affected family (f1) and lines (f0/f3).

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- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure

Run `make BOARD=<board> -C examples/hello-world menuconfig` and verify that the `Enable MCU Clock Output` option is displayed in the STM32 clock configuration submenu. Once selected, the MCO prescaler and source can be selected. By default, the presaler is 1 and the source is PLLCLK.

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output

### Issues/PRs references

Tick an item in #14975 

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * cpu/stm32/kconfigs: select cpu fam/lines without mco prescaler
  * cpu/stm32: model MCO in Kconfig for f0/f1/f3
  * cpu/stm32: model MCO in Kconfig for g0/g4
  * cpu/stm32: model MCO in Kconfig for l0/l1
  * cpu/stm32: model MCO in Kconfig for l4/wb

-- File Changes --

    M cpu/stm32/kconfigs/Kconfig.clk (81)
    M cpu/stm32/kconfigs/f0/Kconfig.lines (3)
    M cpu/stm32/kconfigs/f1/Kconfig (1)
    M cpu/stm32/kconfigs/f3/Kconfig.lines (5)

-- Patch Links --


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