clocksource/drivers/sp804: Prepare for support non-standard register offset

Add two local variables: timer1_base and timer2_base in sp804_of_init(),
to avoid repeatedly calculate the base address of timer2, and make it
easier to recognize timer1. Hope to make the next patch looks more clear.

No functional change.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200918132237.3552-6-thunder.leizhen@huawei.com

Author: Zhen Lei

drivers/clocksource/timer-sp804.c

@@ -188,6 +188,8 @@ static int __init sp804_of_init(struct device_node *np)
 {
 	static bool initialized = false;
 	void __iomem *base;
+	void __iomem *timer1_base;
+	void __iomem *timer2_base;
 	int irq, ret = -EINVAL;
 	u32 irq_num = 0;
 	struct clk *clk1, *clk2;
@@ -197,9 +199,12 @@ static int __init sp804_of_init(struct device_node *np)
 	if (!base)
 		return -ENXIO;
 
+	timer1_base = base;
+	timer2_base = base + TIMER_2_BASE;
+
 	/* Ensure timers are disabled */
-	writel(0, base + TIMER_CTRL);
-	writel(0, base + TIMER_2_BASE + TIMER_CTRL);
+	writel(0, timer1_base + TIMER_CTRL);
+	writel(0, timer2_base + TIMER_CTRL);
 
 	if (initialized || !of_device_is_available(np)) {
 		ret = -EINVAL;
@@ -228,21 +233,21 @@ static int __init sp804_of_init(struct device_node *np)
 	of_property_read_u32(np, "arm,sp804-has-irq", &irq_num);
 	if (irq_num == 2) {
 
-		ret = sp804_clockevents_init(base + TIMER_2_BASE, irq, clk2, name);
+		ret = sp804_clockevents_init(timer2_base, irq, clk2, name);
 		if (ret)
 			goto err;
 
-		ret = sp804_clocksource_and_sched_clock_init(base,
+		ret = sp804_clocksource_and_sched_clock_init(timer1_base,
 							     name, clk1, 1);
 		if (ret)
 			goto err;
 	} else {
 
-		ret = sp804_clockevents_init(base, irq, clk1, name);
+		ret = sp804_clockevents_init(timer1_base, irq, clk1, name);
 		if (ret)
 			goto err;
 
-		ret = sp804_clocksource_and_sched_clock_init(base + TIMER_2_BASE,
+		ret = sp804_clocksource_and_sched_clock_init(timer2_base,
 							     name, clk2, 1);
 		if (ret)
 			goto err;