ARM: OMAP: Don't restore of DMTIMER TISTAT register

The timer TISTAT register is a read-only register and therefore restoring the
context is not needed. Furthermore, the context of TISTAT is never saved
anywhere in the current code. The TISTAT register is read-only for all OMAP
devices from OMAP1 to OMAP4. OMAP5 timers no longer have this register.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

arch/arm/plat-omap/dmtimer.c

@@ -83,9 +83,6 @@ static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
 
 static void omap_timer_restore_context(struct omap_dm_timer *timer)
 {
-	if (timer->revision == 1)
-		__raw_writel(timer->context.tistat, timer->sys_stat);
-
 	__raw_writel(timer->context.tisr, timer->irq_stat);
 	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
 				timer->context.twer);

arch/arm/plat-omap/include/plat/dmtimer.h

@@ -84,7 +84,6 @@ struct omap_dm_timer;
 
 struct timer_regs {
 	u32 tidr;
-	u32 tistat;
 	u32 tisr;
 	u32 tier;
 	u32 twer;