drivers: counter: Counter API implementation for STM32F4 Series (TIMER).

- Shim for counter API using LL_TIM driver.
- Supports all general-purpose (TIMx) timers.

Signed-off-by: Kent Hall <[email protected]>

Author: Kent Hall

drivers/counter/CMakeLists.txt

@@ -12,6 +12,7 @@ zephyr_library_sources_ifdef(CONFIG_COUNTER_MCUX_LPC_RTC        counter_mcux_lpc
 zephyr_library_sources_ifdef(CONFIG_COUNTER_NRF_TIMER           counter_nrfx_timer.c)
 zephyr_library_sources_ifdef(CONFIG_COUNTER_NRF_RTC             counter_nrfx_rtc.c)
 zephyr_library_sources_ifdef(CONFIG_COUNTER_RTC_STM32           counter_ll_stm32_rtc.c)
+zephyr_library_sources_ifdef(CONFIG_COUNTER_TIMER_STM32         counter_ll_stm32_timer.c)
 zephyr_library_sources_ifdef(CONFIG_COUNTER_SAM_TC              counter_sam_tc.c)
 zephyr_library_sources_ifdef(CONFIG_COUNTER_SAM0_TC32           counter_sam0_tc32.c)
 zephyr_library_sources_ifdef(CONFIG_COUNTER_CMOS                counter_cmos.c)

drivers/counter/Kconfig

@@ -36,6 +36,8 @@ source "drivers/counter/Kconfig.imx_epit"
 
 source "drivers/counter/Kconfig.stm32_rtc"
 
+source "drivers/counter/Kconfig.stm32_timer"
+
 source "drivers/counter/Kconfig.sam"
 
 source "drivers/counter/Kconfig.sam0"

drivers/counter/Kconfig.stm32_timer

@@ -0,0 +1,11 @@
+# Copyright (c) 2021 Kent Hall
+# SPDX-License-Identifier: Apache-2.0
+
+DT_COMPAT_ST_STM32_COUNTER := st,stm32-counter
+
+config COUNTER_TIMER_STM32
+	bool "STM32 counter driver"
+	default $(dt_compat_enabled,$(DT_COMPAT_ST_STM32_COUNTER))
+	select USE_STM32_LL_TIM
+	help
+	  Enable the counter driver for STM32 family of processors.