TCB hardware is capable of capturing the timer value to registers RA and
RB. On top, it is capable of triggering on compare against a third
register, RC. Add these registers as extensions.
Signed-off-by: Bence Csókás <csokas.bence@xxxxxxxxx>
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Notes:
Changes in v2:
* Add IRQs
Changes in v3:
* Move IRQs to previous patch
Changes in v4:
* Return the status of the regmap_*() operations
* Add names for the extension numbers