[nrf fromlist] drivers: timer: nrf_grtc: Decouple clock source from CLOCK_CONTROL #3483
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…LOCK_CONTROL The GRTC timer, typically used as sys clock on newer nordic chips, is currently tightly coupled to the CLOCK_CONTROL_NRF drivers though not being dependent on it. The GRTC and its device driver is independent from CLOCK_CONTROL, its clock requirements are managed by hardware, based on its clock source selection. This commit moves the clock source selection to the GRTC driver, and removes the hard coupling to the CLOCK_CONTROL drivers. To preserve backwards compatibility, if CLOCK_CONTROL_NRF_K32SRC_RC is selected, GRTC will default to LFLPRC. Upstream PR #: 99147 Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>
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The GRTC timer, typically used as sys clock on newer nordic chips, is currently tightly coupled to the CLOCK_CONTROL_NRF drivers though not being dependent on it. The GRTC and its device driver is independent from CLOCK_CONTROL, its clock requirements are managed by hardware, based on its clock source selection.
This commit moves the clock source selection to the GRTC driver, and removes the hard coupling to the CLOCK_CONTROL drivers. To preserve backwards compatibility, if CLOCK_CONTROL_NRF_K32SRC_RC is selected, GRTC will default to LFLPRC.