Function fdt_overlay_apply 

pub unsafe extern "C" fn fdt_overlay_apply(
    fdt: *mut c_void,
    fdto: *mut c_void,
) -> c_int

fdt_overlay_apply - Applies a DT overlay on a base DT @fdt: pointer to the base device tree blob @fdto: pointer to the device tree overlay blob

fdt_overlay_apply() will apply the given device tree overlay on the given base device tree.

Expect the base device tree to be modified, even if the function returns an error.

returns: 0, on success -FDT_ERR_NOSPACE, there’s not enough space in the base device tree -FDT_ERR_NOTFOUND, the overlay points to some nonexistent nodes or properties in the base DT -FDT_ERR_BADPHANDLE, -FDT_ERR_BADOVERLAY, -FDT_ERR_NOPHANDLES, -FDT_ERR_INTERNAL, -FDT_ERR_BADLAYOUT, -FDT_ERR_BADMAGIC, -FDT_ERR_BADOFFSET, -FDT_ERR_BADPATH, -FDT_ERR_BADVERSION, -FDT_ERR_BADSTRUCTURE, -FDT_ERR_BADSTATE, -FDT_ERR_TRUNCATED, standard meanings