Kconfig: Add a new CONFIG_HAVE_STRICT_TIMING build definition

Add a new build definition to note micro-controllers that have strict
timing.  The Linux mcu code does not have strict timing - all other
targets currently do.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/Kconfig

@@ -121,6 +121,9 @@ config HAVE_GPIO_HARD_PWM
 config HAVE_GPIO_BITBANGING
     bool
     default n
+config HAVE_STRICT_TIMING
+    bool
+    default n
 config HAVE_CHIPID
     bool
     default n

src/atsam/Kconfig

@@ -11,6 +11,7 @@ config ATSAM_SELECT
     select HAVE_GPIO_SPI
     select HAVE_GPIO_HARD_PWM
     select HAVE_GPIO_BITBANGING
+    select HAVE_STRICT_TIMING
     select HAVE_CHIPID
 
 config BOARD_DIRECTORY

src/atsamd/Kconfig

@@ -11,6 +11,7 @@ config ATSAMD_SELECT
     select HAVE_GPIO_SPI
     select HAVE_GPIO_HARD_PWM if MACH_SAMD21
     select HAVE_GPIO_BITBANGING
+    select HAVE_STRICT_TIMING
     select HAVE_CHIPID
 
 config BOARD_DIRECTORY

src/avr/Kconfig

@@ -11,6 +11,7 @@ config AVR_SELECT
     select HAVE_GPIO_I2C
     select HAVE_GPIO_HARD_PWM
     select HAVE_GPIO_BITBANGING if !MACH_atmega168
+    select HAVE_STRICT_TIMING
 
 config STEP_DELAY
     default -1

src/lpc176x/Kconfig

@@ -10,6 +10,7 @@ config LPC_SELECT
     select HAVE_GPIO_I2C
     select HAVE_GPIO_SPI
     select HAVE_GPIO_BITBANGING
+    select HAVE_STRICT_TIMING
     select HAVE_CHIPID
 
 config BOARD_DIRECTORY

src/pru/Kconfig

@@ -7,6 +7,7 @@ config PRU_SELECT
     default y
     select HAVE_GPIO
     #select HAVE_GPIO_ADC
+    select HAVE_STRICT_TIMING
 
 config BOARD_DIRECTORY
     string

src/stm32/Kconfig

@@ -10,6 +10,7 @@ config STM32_SELECT
     select HAVE_GPIO_I2C
     select HAVE_GPIO_SPI
     select HAVE_GPIO_BITBANGING
+    select HAVE_STRICT_TIMING
     select HAVE_CHIPID
 
 config BOARD_DIRECTORY