Function fdt_get_phandle 

pub unsafe extern "C" fn fdt_get_phandle(
    fdt: *const c_void,
    nodeoffset: c_int,
) -> u32

fdt_get_phandle - retrieve the phandle of a given node @fdt: pointer to the device tree blob @nodeoffset: structure block offset of the node

fdt_get_phandle() retrieves the phandle of the device tree node at structure block offset nodeoffset.

returns: the phandle of the node at nodeoffset, on success (!= 0, != -1) 0, if the node has no phandle, or another error occurs