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arch/arm/src/stm32: unify LSI driver and make RCC headers per-family - #20487
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@raiden00pl please fix the conflicting files |
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Merge the per-family LSI oscillator drivers into a single core-agnostic common/stm32/stm32_lsi.c. To let a common/stm32 driver resolve RCC register definitions for every family without a central chip enumeration, the common/stm32/hardware/stm32_rcc.h dispatcher is removed and each family that uses it now provides its own hardware/stm32_rcc.h. stm32_lsi.c is built unconditionally for all families (including C5 and U3, which had no LSI driver before); unused code is dropped by the linker. The WB stm32_rcc_enable_lsi()/stm32_rcc_disable_lsi() are renamed to the common stm32_rcc_enablelsi()/stm32_rcc_disablelsi(). Signed-off-by: raiden00pl <raiden00@railab.me> Assisted-by: Claude Code
On U5 LSION is in RCC_BDCR, which is write-protected after reset. Without PWR DBP set the LSION write is ignored and stm32_rcc_enablelsi() waits forever for LSIRDY. - Add STM32_HAVE_IP_PWR_M33_V1 (U5) to the common PWR register dispatcher and the common stm32_pwr.h, so common code can reach the U5 PWR definitions and stm32_pwr_enablebkp(). - Rename stm32u5/hardware/stm32_pwr.h to stm32u5xx_pwr.h, so the common dispatcher can include it. - In stm32_lsi.c enable backup domain write access around the BDCR update, as the common LSE drivers do. Signed-off-by: raiden00pl <raiden00@railab.me> Assisted-by: Claude Code
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Summary
Merge the per-family LSI oscillator drivers into a single core-agnostic common/stm32/stm32_lsi.c.
To let a common/stm32 driver resolve RCC register definitions for every family without a central chip enumeration, the
common/stm32/hardware/stm32_rcc.h dispatcher is removed and each family now provides its own hardware/stm32_rcc.h.
Impact
less code duplication
Testing
CI