On Fri, Jun 18, 2021 at 02:27:29PM +0200, Arnd Bergmann wrote:
> On Fri, Jun 18, 2021 at 2:25 PM kernel test robot <lkp@intel.com> wrote:
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/fpga/lattice/machxo2-spi.c:377:34: warning: unused variable 'of_match' [-Wunused-const-variable]
> >    static const struct of_device_id of_match[] = {
> >                                     ^
> >    1 warning generated.
> 
> This is almost always the result of an 'of_match_ptr()' that should be
> removed, I have not
> checked this instance.
> 
>        Arnd

I think the of_device id is missing a #CONFIG_OF

@@ -374,11 +374,13 @@ static int machxo2_spi_probe(struct spi_device *spi)
        return devm_fpga_mgr_register(dev, mgr);
 }

+#ifdef CONFIG_OF
 static const struct of_device_id of_match[] = {
        { .compatible = "lattice,machxo2-slave-spi", },
        {}
 };
 MODULE_DEVICE_TABLE(of, of_match);
+#endif

- Moritz