how to set state_use_accessors of Linux irq?

Question

struct irq_data has member of state_use_accessors, and in linux/irq.h there are some static function which use state_use_accessors to get state.

I have questions that: 1, when and where is the state_use_accessors value set? I grep the source code, but not found.

2, the function used state_use_accessors is static, such as

211 static inline u32 irqd_get_trigger_type(struct irq_data *d)
212 {
213         return d->state_use_accessors & IRQD_TRIGGER_MASK;
214 }

can I use the implementation in my own code?

Thank you~

Kind Regards Bill Wang