v4.19.13 snapshot.
diff --git a/drivers/siox/Kconfig b/drivers/siox/Kconfig
new file mode 100644
index 0000000..083d2e6
--- /dev/null
+++ b/drivers/siox/Kconfig
@@ -0,0 +1,18 @@
+menuconfig SIOX
+ tristate "Eckelmann SIOX Support"
+ help
+ SIOX stands for Serial Input Output eXtension and is a synchronous
+ bus system invented by Eckelmann AG. It is used in their control and
+ remote monitoring systems for commercial and industrial refrigeration
+ to drive additional I/O units.
+
+ Unless you know better, it is probably safe to say "no" here.
+
+if SIOX
+
+config SIOX_BUS_GPIO
+ tristate "SIOX GPIO bus driver"
+ help
+ SIOX bus driver that controls the four bus lines using GPIOs.
+
+endif