include: drivers: pwm: extend the pwm flags to be soc specific

Add 8 bits to the pwm_flags_t so that upper byte is reserved
for non-standard but soc specific dts flags and keeping the low
Byte for standard flags.
Some of SoC like STM32 mcus can then define their own flags
in their dt-bindings/pwm.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

include/drivers/pwm.h

@@ -64,8 +64,12 @@ extern "C" {
 
 /**
  * @brief Provides a type to hold PWM configuration flags.
+ *
+ * The lower 8 bits are used for standard flags.
+ * The upper 8 bits are reserved for SoC specific flags.
  */
-typedef uint8_t pwm_flags_t;
+
+typedef uint16_t pwm_flags_t;
 
 /**
  * @typedef pwm_pin_set_t

include/dt-bindings/pwm/pwm.h

@@ -11,6 +11,7 @@
  * The `PWM_POLARITY_*` flags are used with pwm_pin_set_cycles(),
  * pwm_pin_set_usec(), pwm_pin_set_nsec() or pwm_pin_configure_capture() to
  * specify the polarity of a PWM pin.
+ * The flags are on the lower 8bits of the pwm_flags_t
  * @{
  */
 /** PWM pin normal polarity (active-high pulse). */