[U-Boot] [PATCH] armv8: Allow SoCs to override the generic timer

[Stephen Warren]

From: Thierry Reding <treding at nvidia.com>

Some SoCs come with a custom timer interface, so allow them to use that
instead.

swarren notes: I did consider reworking this patch so the Makefile only
compiles generic_timer.c ifndef CONFIG_SYS_TIMER_COUNTER. However, I can
foresee a time where generic_timer.c contains both routines to implement
U-Boot's internal timer, and to perform other operations related to the
generic timer, such as initializing the CNTFRQ register for a booted OS.
If that happens, this version of the change will result in simpler future
patches.

Signed-off-by: Thierry Reding <treding at nvidia.com>
Signed-off-by: Tom Warren <twarren at nvidia.com>
Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
 arch/arm/cpu/armv8/generic_timer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/cpu/armv8/generic_timer.c b/arch/arm/cpu/armv8/generic_timer.c
index 8e60baebc534..98a865cf6ffc 100644
--- a/arch/arm/cpu/armv8/generic_timer.c
+++ b/arch/arm/cpu/armv8/generic_timer.c
@@ -9,6 +9,7 @@
 #include <command.h>
 #include <asm/system.h>
 
+#ifndef CONFIG_SYS_TIMER_COUNTER
 /*
  * Generic timer implementation of get_tbclk()
  */
@@ -40,3 +41,4 @@ unsigned long timer_read_counter(void)
 #endif
 	return cntpct;
 }
+#endif
-- 
1.9.1