fsi: core: Add check for master property no-scan-on-init

Prior to scanning a master check if the optional property
no-scan-on-init is present. If it is then avoid scanning. This is
necessary in cases where a master scan could interfere with another
FSI master on the same bus.

Signed-off-by: Christopher Bostic <[e-mail]>
Acked-by: Jeremy Kerr <[e-mail]>
Signed-off-by: Joel Stanley <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/fsi/fsi-core.c

···
 int fsi_master_register(struct fsi_master *master)
 {
 	int rc;
+	struct device_node *np;
 
 	if (!master)
 		return -EINVAL;
···
 		return rc;
 	}
 
-	fsi_master_scan(master);
+	np = dev_of_node(&master->dev);
+	if (!of_property_read_bool(np, "no-scan-on-init"))
+		fsi_master_scan(master);
 
 	return 0;
 }