rtc/ia64: remove legacy efirtc driver

There are two EFI RTC drivers, the original drivers/char/efirtc.c
driver and the more modern drivers/rtc/rtc-efi.c.

Both implement the same interface, but the new one does so
in a more portable way.

Move everything over to that one and remove the old one.

Cc: linux-ia64@vger.kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200226224322.187960-1-alexandre.belloni@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/ia64/configs/bigsur_defconfig

@@ -57,7 +57,8 @@ CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 # CONFIG_HW_RANDOM is not set
-CONFIG_EFI_RTC=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_EFI=y
 CONFIG_I2C=y
 CONFIG_I2C_CHARDEV=y
 CONFIG_AGP=m

arch/ia64/configs/generic_defconfig

@@ -94,7 +94,8 @@ CONFIG_SERIAL_8250_NR_UARTS=6
 CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 # CONFIG_HW_RANDOM is not set
-CONFIG_EFI_RTC=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_EFI=y
 CONFIG_RAW_DRIVER=m
 CONFIG_HPET=y
 CONFIG_AGP=m

arch/ia64/configs/gensparse_defconfig

@@ -82,7 +82,8 @@ CONFIG_SERIAL_8250_NR_UARTS=6
 CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 # CONFIG_HW_RANDOM is not set
-CONFIG_EFI_RTC=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_EFI=y
 CONFIG_RAW_DRIVER=m
 CONFIG_HPET=y
 CONFIG_AGP=m

arch/ia64/configs/tiger_defconfig

@@ -86,7 +86,8 @@ CONFIG_SERIAL_8250_NR_UARTS=6
 CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 # CONFIG_HW_RANDOM is not set
-CONFIG_EFI_RTC=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_EFI=y
 CONFIG_RAW_DRIVER=m
 CONFIG_HPET=y
 CONFIG_AGP=m

arch/ia64/configs/zx1_defconfig

@@ -69,7 +69,8 @@ CONFIG_SERIAL_8250_NR_UARTS=8
 CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y
 # CONFIG_HW_RANDOM is not set
-CONFIG_EFI_RTC=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_EFI=y
 CONFIG_I2C_CHARDEV=y
 CONFIG_AGP=y
 CONFIG_AGP_HP_ZX1=y

drivers/char/Kconfig

@@ -250,10 +250,6 @@ config JS_RTC
 	  To compile this driver as a module, choose M here: the
 	  module will be called js-rtc.
 
-config EFI_RTC
-	bool "EFI Real Time Clock Services"
-	depends on IA64
-
 endif # RTC_LIB
 
 config DTLK

drivers/char/Makefile

@@ -22,7 +22,6 @@ obj-$(CONFIG_APPLICOM)		+= applicom.o
 obj-$(CONFIG_SONYPI)		+= sonypi.o
 obj-$(CONFIG_RTC)		+= rtc.o
 obj-$(CONFIG_HPET)		+= hpet.o
-obj-$(CONFIG_EFI_RTC)		+= efirtc.o
 obj-$(CONFIG_XILINX_HWICAP)	+= xilinx_hwicap/
 obj-$(CONFIG_NVRAM)		+= nvram.o
 obj-$(CONFIG_TOSHIBA)		+= toshiba.o