of_fdt_device_is_available
if (!of_fdt_device_is_available(fdt, node))
!of_fdt_device_is_available(blob, offset))
bool of_fdt_device_is_available(const void *blob, unsigned long node);
if (!of_fdt_device_is_available(fdt, child))
if (!of_fdt_device_is_available(fdt, child))