drivers/soc/litex: drop obsolete dependency on COMPILE_TEST

Since commit 0166dc11be91 ("of: make CONFIG_OF user selectable"), it
is possible to test-build any driver which depends on OF on any
architecture by explicitly selecting OF. Therefore depending on
COMPILE_TEST as an alternative is no longer needed.

It is actually better to always build such drivers with OF enabled,
so that the test builds are closer to how each driver will actually be
built on its intended target. Building them without OF may not test
much as the compiler will optimize out potentially large parts of the
code. In the worst case, this could even pop false positive warnings.
Dropping COMPILE_TEST here improves the quality of our testing and
avoids wasting time on non-existent issues.

As a minor optimization, this also lets us drop of_match_ptr() and
ifdef-guarding, as we now know what they will resolve to, we might as
well save cpp some work.

Signed-off-by: Jean Delvare <[e-mail]>
Reviewed-by: Gabriel Somlo <[e-mail]>
Cc: Karol Gugala <[e-mail]>
Cc: Mateusz Holenko <[e-mail]>
Cc: Joel Stanley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnd Bergmann <[e-mail]>

drivers/soc/litex/Kconfig

···
 
 config LITEX_SOC_CONTROLLER
 	tristate "Enable LiteX SoC Controller driver"
-	depends on OF || COMPILE_TEST
+	depends on OF
 	depends on HAS_IOMEM
 	select LITEX
 	help

drivers/soc/litex/litex_soc_ctrl.c

···
 	return NOTIFY_DONE;
 }
 
-#ifdef CONFIG_OF
 static const struct of_device_id litex_soc_ctrl_of_match[] = {
 	{.compatible = "litex,soc-controller"},
 	{},
 };
 MODULE_DEVICE_TABLE(of, litex_soc_ctrl_of_match);
-#endif /* CONFIG_OF */
 
 static int litex_soc_ctrl_probe(struct platform_device *pdev)
 {
···
 static struct platform_driver litex_soc_ctrl_driver = {
 	.driver = {
 		.name = "litex-soc-controller",
-		.of_match_table = of_match_ptr(litex_soc_ctrl_of_match)
+		.of_match_table = litex_soc_ctrl_of_match,
 	},
 	.probe = litex_soc_ctrl_probe,
 	.remove_new = litex_soc_ctrl_remove,