[U-Boot] [RFC PATCH 03/13] arm: move SYS_ARCH_TIMER to KConfig

[Andre Przywara]

SYS_ARCH_TIMER guards the usage of the ARM Generic Timer (aka arch
timer) in U-Boot.
At the moment it is mandatory for ARMv8 and used by two ARMv7 boards.
Add a proper Kconfig symbol to express this dependency properly,
allowing certain board configuration to later disable arch timer in case
there are any problems with it.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 arch/arm/Kconfig                     | 11 +++++++++++
 arch/arm/cpu/armv8/Makefile          |  2 +-
 arch/arm/mach-imx/mx7ulp/Kconfig     |  1 +
 include/configs/mx7ulp_evk.h         |  1 -
 include/configs/ti_armv7_keystone2.h |  1 -
 scripts/config_whitelist.txt         |  1 -
 6 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 88c8417120..cfde0758ef 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -209,6 +209,16 @@ config SYS_CACHELINE_SIZE
 	default 64 if SYS_CACHE_SHIFT_6
 	default 32 if SYS_CACHE_SHIFT_5
 
+config SYS_ARCH_TIMER
+	bool "ARM Generic Timer support"
+	depends on CPU_V7 || ARM64
+	default y if ARM64
+	help
+	  The ARM Generic Timer (aka arch-timer) provides an architected
+	  interface to a timer source on an SoC.
+	  It is mandantory for ARMv8 implementation and widely available
+	  on ARMv7 systems.
+
 config ARM_SMCCC
 	bool "Support for ARM SMC Calling Convention (SMCCC)"
 	depends on CPU_V7 || ARM64
@@ -586,6 +596,7 @@ config ARCH_KEYSTONE
 	select SUPPORT_SPL
 	select SYS_THUMB_BUILD
 	select CMD_POWEROFF
+	select SYS_ARCH_TIMER
 	imply CMD_MTDPARTS
 	imply FIT
 	imply CMD_SAVES
diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile
index 1249547436..d18b38eb9e 100644
--- a/arch/arm/cpu/armv8/Makefile
+++ b/arch/arm/cpu/armv8/Makefile
@@ -9,7 +9,7 @@ extra-y	:= start.o
 
 obj-y	+= cpu.o
 ifndef CONFIG_$(SPL_TPL_)TIMER
-obj-y	+= generic_timer.o
+obj-$(CONFIG_SYS_ARCH_TIMER) += generic_timer.o
 endif
 obj-y	+= cache_v8.o
 obj-y	+= exceptions.o
diff --git a/arch/arm/mach-imx/mx7ulp/Kconfig b/arch/arm/mach-imx/mx7ulp/Kconfig
index 1bdc85a9a0..d4b0299dbd 100644
--- a/arch/arm/mach-imx/mx7ulp/Kconfig
+++ b/arch/arm/mach-imx/mx7ulp/Kconfig
@@ -9,6 +9,7 @@ choice
 
 config TARGET_MX7ULP_EVK
         bool "Support mx7ulp EVK board"
+	select SYS_ARCH_TIMER
 
 endchoice
 
diff --git a/include/configs/mx7ulp_evk.h b/include/configs/mx7ulp_evk.h
index 6ab8db36a8..3d08ba233c 100644
--- a/include/configs/mx7ulp_evk.h
+++ b/include/configs/mx7ulp_evk.h
@@ -47,7 +47,6 @@
 /* Using ULP WDOG for reset */
 #define WDOG_BASE_ADDR			WDG1_RBASE
 
-#define CONFIG_SYS_ARCH_TIMER
 #define CONFIG_SYS_HZ_CLOCK		1000000 /* Fixed at 1Mhz from TSTMR */
 
 #define CONFIG_INITRD_TAG
diff --git a/include/configs/ti_armv7_keystone2.h b/include/configs/ti_armv7_keystone2.h
index 562bb65636..dca6cf004c 100644
--- a/include/configs/ti_armv7_keystone2.h
+++ b/include/configs/ti_armv7_keystone2.h
@@ -17,7 +17,6 @@
 
 /* SoC Configuration */
 #define CONFIG_ARCH_CPU_INIT
-#define CONFIG_SYS_ARCH_TIMER
 #ifndef CONFIG_SYS_TEXT_BASE
 #define CONFIG_SYS_TEXT_BASE		0x0c000000
 #endif
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index 4ce87484c3..b222ae1172 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -2285,7 +2285,6 @@ CONFIG_SYS_APP1_BASE
 CONFIG_SYS_APP1_SIZE
 CONFIG_SYS_APP2_BASE
 CONFIG_SYS_APP2_SIZE
-CONFIG_SYS_ARCH_TIMER
 CONFIG_SYS_ARM_CACHE_WRITETHROUGH
 CONFIG_SYS_AT91_CPU_NAME
 CONFIG_SYS_AT91_MAIN_CLOCK
-- 
2.14.1