[PATCH v2] clocksource: arc_timer: eliminate redefined macro error

[Randy Dunlap]

In drivers/clocksource/, 3 drivers use "TIMER_CTRL_IE" with 3 different
values.  Two of them (mps2-timer.c and timer-sp804.c/timer-sp.h) are
localized and left unmodifed.

One of them uses a shared header file (<soc/arc/timers.h>), which is
what is causing the "redefined" warnings, so change the macro name in
that driver only. Also change the TIMER_CTRL_NH macro name.
Both macro names are prefixed with "ARC_" to reduce the likelihood
of future name collisions.

In file included from ../drivers/clocksource/timer-sp804.c:24:
../drivers/clocksource/timer-sp.h:25: error: "TIMER_CTRL_IE" redefined [-Werror]
   25 | #define TIMER_CTRL_IE           (1 << 5)        /*   VR */
../include/soc/arc/timers.h:20: note: this is the location of the previous definition
   20 | #define TIMER_CTRL_IE           (1 << 0) /* Interrupt when Count reaches limit */

Fixes: b26c2e3823ba ("ARC: breakout timer include code into separate header")
Signed-off-by: Randy Dunlap <rdunlap at infradead.org>
Cc: Vineet Gupta <vgupta at kernel.org>
Cc: linux-snps-arc at lists.infradead.org
Cc: Daniel Lezcano <daniel.lezcano at linaro.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Shahab Vahedi <Shahab.Vahedi at synopsys.com>
---
v2: prefix both TIMER_CTRL_xx macros with ARC_ (suggested by
    Shahab Vahedi <Shahab.Vahedi at synopsys.com>

 drivers/clocksource/arc_timer.c |    6 +++---
 include/soc/arc/timers.h        |    4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

--- linux-next-20210917.orig/include/soc/arc/timers.h
+++ linux-next-20210917/include/soc/arc/timers.h
@@ -17,8 +17,8 @@
 #define ARC_REG_TIMER1_CNT	0x100	/* timer 1 count */
 
 /* CTRL reg bits */
-#define TIMER_CTRL_IE	        (1 << 0) /* Interrupt when Count reaches limit */
-#define TIMER_CTRL_NH	        (1 << 1) /* Count only when CPU NOT halted */
+#define ARC_TIMER_CTRL_IE	(1 << 0) /* Interrupt when Count reaches limit */
+#define ARC_TIMER_CTRL_NH	(1 << 1) /* Count only when CPU NOT halted */
 
 #define ARC_TIMERN_MAX		0xFFFFFFFF
 
--- linux-next-20210917.orig/drivers/clocksource/arc_timer.c
+++ linux-next-20210917/drivers/clocksource/arc_timer.c
@@ -225,7 +225,7 @@ static int __init arc_cs_setup_timer1(st
 
 	write_aux_reg(ARC_REG_TIMER1_LIMIT, ARC_TIMERN_MAX);
 	write_aux_reg(ARC_REG_TIMER1_CNT, 0);
-	write_aux_reg(ARC_REG_TIMER1_CTRL, TIMER_CTRL_NH);
+	write_aux_reg(ARC_REG_TIMER1_CTRL, ARC_TIMER_CTRL_NH);
 
 	sched_clock_register(arc_timer1_clock_read, 32, arc_timer_freq);
 
@@ -245,7 +245,7 @@ static void arc_timer_event_setup(unsign
 	write_aux_reg(ARC_REG_TIMER0_LIMIT, cycles);
 	write_aux_reg(ARC_REG_TIMER0_CNT, 0);	/* start from 0 */
 
-	write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH);
+	write_aux_reg(ARC_REG_TIMER0_CTRL, ARC_TIMER_CTRL_IE | ARC_TIMER_CTRL_NH);
 }
 
 
@@ -294,7 +294,7 @@ static irqreturn_t timer_irq_handler(int
 	 *      explicitly clears IP bit
 	 * 2. Re-arm interrupt if periodic by writing to IE bit [0]
 	 */
-	write_aux_reg(ARC_REG_TIMER0_CTRL, irq_reenable | TIMER_CTRL_NH);
+	write_aux_reg(ARC_REG_TIMER0_CTRL, irq_reenable | ARC_TIMER_CTRL_NH);
 
 	evt->event_handler(evt);