Function with different types of arguments

Hello!
In the program, I decided to redo some of the functions and added the structure:

typedef struct
{
  GPIO_TypeDef * GPIOx;
  uint16_t PINx;
}GPIO_PINdef;

Previously, the function looked like this: void GPIO_InitPIN(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin_x)

Now it looks like this: void GPIO_InitPIN(GPIO_PINdef GPIOx)

So here is the question, calling a new function now works both in the old and new way, i.e. to call a function in this form: GPIO_InitPIN(GPIOB, GPIO_Pin_8)

and in this form: 

GPIO_PINdef SPI_CS;
GPIO_InitPIN(SPI_CS);
the compiler does not swear and the program runs correctly.

But everything was fine until I started getting rid of "warning" during compilation, namely "function" GPIO_InitPIN "declared implicitly".
I copy the function description into the header file and after that everything stops working:
void GPIO_InitPIN (GPIO_PINdef x); - adding this description in header file, swears that there are too many arguments when calling this function GPIO_InitPIN(GPIOB, GPIO_Pin_8)

How can this function be written in the header file to get rid of "warning"?

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