Kconfig: Convert CONFIG_RTC_MC146818 to Kconfig

Move this option to Kconfig and tidy up the two boards which use it.
Signed-off-by: NSimon Glass <sjg@chromium.org>

configs/edison_defconfig

@@ -33,6 +33,7 @@ CONFIG_CPU=y
 CONFIG_DFU_MMC=y
 CONFIG_DFU_RAM=y
 CONFIG_DM_PCI_COMPAT=y
+CONFIG_RTC_MC146818=y
 CONFIG_USB_DWC3_GADGET=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_MANUFACTURER="Intel"

configs/malta64_defconfig

@@ -23,4 +23,5 @@ CONFIG_DEFAULT_DEVICE_TREE="mti,malta"
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_PCI=y
+CONFIG_RTC_MC146818=y
 CONFIG_SYS_NS16550=y

configs/malta64el_defconfig

@@ -24,4 +24,5 @@ CONFIG_DEFAULT_DEVICE_TREE="mti,malta"
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_PCI=y
+CONFIG_RTC_MC146818=y
 CONFIG_SYS_NS16550=y

configs/malta_defconfig

@@ -22,4 +22,5 @@ CONFIG_DEFAULT_DEVICE_TREE="mti,malta"
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_PCI=y
+CONFIG_RTC_MC146818=y
 CONFIG_SYS_NS16550=y

configs/maltael_defconfig

@@ -23,4 +23,5 @@ CONFIG_DEFAULT_DEVICE_TREE="mti,malta"
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_PCI=y
+CONFIG_RTC_MC146818=y
 CONFIG_SYS_NS16550=y

drivers/rtc/Kconfig

@@ -68,4 +68,12 @@ config RTC_S35392A
 	help
 	  Enable s35392a driver which provides rtc get and set function.
 
+config RTC_MC146818
+	bool "Enable MC146818 driver"
+	help
+	  This is a widely used real-time clock chip originally by Motorola
+	  and now available from NXP. It includes a battery-backed real-time
+	  clock with a wide array of features and 50 bytes of general-purpose,
+	  battery-backed RAM. The driver supports access to the clock and RAM.
+
 endmenu

include/configs/edison.h

@@ -48,6 +48,5 @@
 
 /* RTC */
 #define CONFIG_SYS_ISA_IO_BASE_ADDRESS	0
-#define CONFIG_RTC_MC146818
 
 #endif

include/configs/malta.h

@@ -19,7 +19,6 @@
 #define CONFIG_PCNET_79C973
 #define PCNET_HAS_PROM
 
-#define CONFIG_RTC_MC146818
 #define CONFIG_SYS_ISA_IO_BASE_ADDRESS	0
 
 /*

scripts/config_whitelist.txt

@@ -1673,7 +1673,6 @@ CONFIG_RTC_IMXDI
 CONFIG_RTC_M41T11
 CONFIG_RTC_M41T62
 CONFIG_RTC_MC13XXX
-CONFIG_RTC_MC146818
 CONFIG_RTC_MCFRRTC
 CONFIG_RTC_MCP79411
 CONFIG_RTC_MXS