Guillaume Revaillot b98dd8eee0 stm32: exti: exti_select_source: rework and use EXTI_EXTICR. ...

EXTICR on stm32g0 is in exti registers range. Previous chips used to have that
gpio port exti mux configuration accessible via AFIO_EXTICR or SYSCFG_EXTICR.

Also, the new chip now use 8 bits coded value instead of previously 4 for the
extcr mux selection value (see AFIO/SYSCFG/EXTI_EXTICR_FIELDSIZE)

Let's define two helpers:  EXTICR_SELECTION_REG (to get proper AFIO/SYSCFG/
EXTI_EXTICR register) and EXTICR_SELECTION_FIELDSIZE (to get proper AFIO/SYSCFG/
EXTI_EXTICR_FIELDSIZE value), and use it them exti_select_source to determine
exticr mux selection bits shift and mask.

2019-01-31 09:57:46 +00:00

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