arch: arm: cortex_m: conditionally select ARCH_HAS_TIMING_FUNCTIONS

Cortex-M SoCs implement (optionally) the Data Watchpoint and
Tracing Unit (DWT), which can be used for timing functions.
Select the corresponding ARCH capability if the SoC implements
the DWT.

Signed-off-by: Ioannis Glaropoulos <[email protected]>

Author: ioannisg

arch/arm/core/aarch32/Kconfig

@@ -18,6 +18,7 @@ config CPU_CORTEX_M
 	select ARCH_HAS_NESTED_EXCEPTION_DETECTION
 	select SWAP_NONATOMIC
 	select ARCH_HAS_EXTRA_EXCEPTION_INFO
+	select ARCH_HAS_TIMING_FUNCTIONS if CPU_CORTEX_M_HAS_DWT
 	imply XIP
 	help
 	  This option signifies the use of a CPU of the Cortex-M family.