kinetis/pit: Update Kconfig, implement oneshot PIT

Implementation of the Kinetis' Periodic Interrupt Timer (PIT). The lower
half driver is oneshot.

Signed-off-by: Jiri Vlasak <jvlasak@elektroline.cz>

Author: ghnotgood

arch/arm/src/kinetis/CMakeLists.txt

@@ -131,4 +131,8 @@ if(CONFIG_ANALOG)
   endif()
 endif()
 
+if(CONFIG_KINETIS_PIT)
+  list(APPEND SRCS kinetis_oneshot_pit.c)
+endif()
+
 target_sources(arch PRIVATE ${SRCS})

arch/arm/src/kinetis/Kconfig

@@ -687,6 +687,51 @@ config KINETIS_TPM2
 	---help---
 		Support TPM module 2
 
+
+config KINETIS_PIT
+	bool "Periodic Interrupt Timer (PIT)"
+	default n
+	select ONESHOT
+	select ONESHOT_COUNT
+	---help---
+		Support for Periodic Interrupt Timer (PIT).
+
+		From the Reference Manual:
+
+			The PIT module is an array of timers that can be
+			used to raise interrupts and trigger DMA channels.
+
+		Currently, PIT is used for oneshot lower half driver.
+
+config KINETIS_PIT_CH0
+	bool "Channel 0"
+	default n
+	depends on KINETIS_PIT
+	---help---
+		Enable Channel 0 of the Periodic Interrupt Timer (PIT).
+
+config KINETIS_PIT_CH1
+	bool "Channel 1"
+	default n
+	depends on KINETIS_PIT
+	---help---
+		Enable Channel 1 of the Periodic Interrupt Timer (PIT).
+
+config KINETIS_PIT_CH2
+	bool "Channel 2"
+	default n
+	depends on KINETIS_PIT
+	---help---
+		Enable Channel 2 of the Periodic Interrupt Timer (PIT).
+
+config KINETIS_PIT_CH3
+	bool "Channel 3"
+	default n
+	depends on KINETIS_PIT
+	---help---
+		Enable Channel 3 of the Periodic Interrupt Timer (PIT).
+
+
 config KINETIS_LPTMR0
 	bool "Low power timer 0 (LPTMR0)"
 	default n
@@ -783,12 +828,6 @@ config KINETIS_PDB
 	---help---
 		Support the Programmable Delay Block
 
-config KINETIS_PIT
-	bool "Programmable interval timer (PIT)"
-	default n
-	---help---
-		Support Programmable Interval Timers
-
 endmenu
 
 menu "Kinetis FTM PWM Configuration"

arch/arm/src/kinetis/Make.defs

@@ -39,6 +39,10 @@ ifneq ($(CONFIG_SCHED_TICKLESS),y)
 CHIP_CSRCS += kinetis_timerisr.c
 endif
 
+ifeq ($(CONFIG_KINETIS_PIT),y)
+CHIP_CSRCS += kinetis_oneshot_pit.c
+endif
+
 ifeq ($(CONFIG_BUILD_PROTECTED),y)
 CHIP_CSRCS += kinetis_userspace.c
 endif