clang-format: Put function definition parentheses on own line?

Is it possible to coax clang-format to write function definitions like:

int

mynamespace::myfunction
(

int a,

int b
)
{

// code
}

I can get parameters to come out right, but I can’t find any option to control breaking a line before the parentheses in a function declaration.

No, there is no such option yet.