serial: Add Actions Semi OWL UART support

This commit adds Actions Semi OWL family UART support. This driver
relies on baudrate configured by primary bootloaders.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 2940bd0..766e5ce 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -625,6 +625,14 @@
 	  for example APQ8016 and MSM8916.
 	  Single baudrate is supported in current implementation (115200).
 
+config OWL_SERIAL
+	bool "Actions Semi OWL UART"
+	depends on DM_SERIAL && ARCH_OWL
+	help
+	  If you have a Actions Semi OWL based board and want to use the on-chip
+	  serial port, say Y to this option. If unsure, say N.
+	  Single baudrate is supported in current implementation (115200).
+
 config PXA_SERIAL
 	bool "PXA serial port support"
 	help