Making top down shooter for andorid with joystick

So im making a top down android game in whic player movemnt is controlled by on screen joystick input.. A gun gameobject is added to the player parent gameobject. I want it such that the gun faces in the direction of my joystick input.movement. If i am going up then my gun should face in the same direction. If im rotating the joystick clockwise the gun should also rotate clockwise..i can draw a line renderer to a certain range in the direction the gun is pointing, and spawn projectile that travels in that direction, but i dont know how to rotate the gun with the joystick input.. pls help.