of: Move simple-framebuffer device handling from simplefb to of

This code is required for both simplefb and simpledrm, so let's move it
into the OF core instead of having it as an ad-hoc initcall in the
drivers.
Signed-off-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20211212062407.138309-2-marcan@marcan.st

drivers/of/platform.c

@@ -540,6 +540,10 @@ static int __init of_platform_default_populate_init(void)
 		of_node_put(node);
 	}
 
+	node = of_get_compatible_child(of_chosen, "simple-framebuffer");
+	of_platform_device_create(node, NULL, NULL);
+	of_node_put(node);
+
 	/* Populate everything else. */
 	of_platform_default_populate(NULL, NULL, NULL);
 

drivers/video/fbdev/simplefb.c

@@ -530,26 +530,7 @@ static struct platform_driver simplefb_driver = {
 	.remove = simplefb_remove,
 };
 
-static int __init simplefb_init(void)
-{
-	int ret;
-	struct device_node *np;
-
-	ret = platform_driver_register(&simplefb_driver);
-	if (ret)
-		return ret;
-
-	if (IS_ENABLED(CONFIG_OF_ADDRESS) && of_chosen) {
-		for_each_child_of_node(of_chosen, np) {
-			if (of_device_is_compatible(np, "simple-framebuffer"))
-				of_platform_device_create(np, NULL, NULL);
-		}
-	}
-
-	return 0;
-}
-
-fs_initcall(simplefb_init);
+module_platform_driver(simplefb_driver);
 
 MODULE_AUTHOR("Stephen Warren <swarren@wwwdotorg.org>");
 MODULE_DESCRIPTION("Simple framebuffer driver");