sdio: UART/GPS driver

This currently only accepts the GPS class since that's all I have for
testing.  Tested with a Matsushita GPS and gpsd version 2.34.

Signed-off-by: Nicolas Pitre <npitre@mvista.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig
index a49cb97..aa8a4e4 100644
--- a/drivers/mmc/card/Kconfig
+++ b/drivers/mmc/card/Kconfig
@@ -32,3 +32,10 @@
 
 	  If unsure, say Y here.
 
+config SDIO_UART
+	tristate "SDIO UART/GPS class support"
+	depends on MMC
+	help
+	  SDIO function driver for SDIO cards that implements the UART
+	  class, as well as the GPS class which appears like a UART.
+