clocksource/drivers/tegra: Minor code clean up

Correct typo and use proper upper casing for acronyms in the comments,
use common style for error messages, prepend error messages with
"tegra-timer:", add error message for cpuhp_setup_state() failure and
clean up whitespaces in the code to fix checkpatch warnings.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-By: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/drivers/clocksource/timer-tegra20.c b/drivers/clocksource/timer-tegra20.c
index e2ef6b8211a560204886c2a3f6a21010d685da5b..6a3704142f31f7f262cdb8afc9437ae9df9d8d30 100644 (file)
--- a/drivers/clocksource/timer-tegra20.c
+++ b/drivers/clocksource/timer-tegra20.c
@@ -6,6 +6,8 @@
  *     Colin Cross <ccross@google.com>
  */
 
+#define pr_fmt(fmt)    "tegra-timer: " fmt
+
 #include <linux/clk.h>
 #include <linux/clockchips.h>
 #include <linux/cpu.h>
@@ -21,13 +23,13 @@
 
 #include "timer-of.h"
 
-#define RTC_SECONDS            0x08
-#define RTC_SHADOW_SECONDS     0x0c
-#define RTC_MILLISECONDS       0x10
+#define RTC_SECONDS            0x08
+#define RTC_SHADOW_SECONDS     0x0c
+#define RTC_MILLISECONDS       0x10
 
-#define TIMERUS_CNTR_1US 0x10
-#define TIMERUS_USEC_CFG 0x14
-#define TIMERUS_CNTR_FREEZE 0x4c
+#define TIMERUS_CNTR_1US       0x10
+#define TIMERUS_USEC_CFG       0x14
+#define TIMERUS_CNTR_FREEZE    0x4c
 
 #define TIMER_PTV              0x0
 #define TIMER_PTV_EN           BIT(31)
@@ -48,7 +50,7 @@ static u32 usec_config;
 static void __iomem *timer_reg_base;
 
 static int tegra_timer_set_next_event(unsigned long cycles,
-                                        struct clock_event_device *evt)
+                                     struct clock_event_device *evt)
 {
        void __iomem *reg_base = timer_of_base(to_timer_of(evt));
 
@@ -169,15 +171,17 @@ static struct timer_of suspend_rtc_to = {
 
 /*
  * tegra_rtc_read - Reads the Tegra RTC registers
- * Care must be taken that this funciton is not called while the
+ * Care must be taken that this function is not called while the
  * tegra_rtc driver could be executing to avoid race conditions
  * on the RTC shadow register
  */
 static u64 tegra_rtc_read_ms(struct clocksource *cs)
 {
        void __iomem *reg_base = timer_of_base(&suspend_rtc_to);
+
        u32 ms = readl_relaxed(reg_base + RTC_MILLISECONDS);
        u32 s = readl_relaxed(reg_base + RTC_SHADOW_SECONDS);
+
        return (u64)s * MSEC_PER_SEC + ms;
 }
 
@@ -222,7 +226,7 @@ static int __init tegra_init_timer(struct device_node *np, bool tegra20)
 
        to = this_cpu_ptr(&tegra_to);
        ret = timer_of_init(np, to);
-       if (ret < 0)
+       if (ret)
                goto out;
 
        timer_reg_base = timer_of_base(to);
@@ -281,8 +285,7 @@ static int __init tegra_init_timer(struct device_node *np, bool tegra20)
                cpu_to->clkevt.cpumask = cpumask_of(cpu);
                cpu_to->clkevt.irq = irq_of_parse_and_map(np, idx);
                if (!cpu_to->clkevt.irq) {
-                       pr_err("%s: can't map IRQ for CPU%d\n",
-                              __func__, cpu);
+                       pr_err("failed to map irq for cpu%d\n", cpu);
                        ret = -EINVAL;
                        goto out_irq;
                }
@@ -292,8 +295,8 @@ static int __init tegra_init_timer(struct device_node *np, bool tegra20)
                                  IRQF_TIMER | IRQF_NOBALANCING,
                                  cpu_to->clkevt.name, &cpu_to->clkevt);
                if (ret) {
-                       pr_err("%s: cannot setup irq %d for CPU%d\n",
-                               __func__, cpu_to->clkevt.irq, cpu);
+                       pr_err("failed to set up irq for cpu%d: %d\n",
+                              cpu, ret);
                        irq_dispose_mapping(cpu_to->clkevt.irq);
                        cpu_to->clkevt.irq = 0;
                        goto out_irq;
@@ -312,11 +315,14 @@ static int __init tegra_init_timer(struct device_node *np, bool tegra20)
        register_current_timer_delay(&tegra_delay_timer);
 #endif
 
-       cpuhp_setup_state(CPUHP_AP_TEGRA_TIMER_STARTING,
-                         "AP_TEGRA_TIMER_STARTING", tegra_timer_setup,
-                         tegra_timer_stop);
+       ret = cpuhp_setup_state(CPUHP_AP_TEGRA_TIMER_STARTING,
+                               "AP_TEGRA_TIMER_STARTING", tegra_timer_setup,
+                               tegra_timer_stop);
+       if (ret)
+               pr_err("failed to set up cpu hp state: %d\n", ret);
 
        return ret;
+
 out_irq:
        for_each_possible_cpu(cpu) {
                struct timer_of *cpu_to;
@@ -329,6 +335,7 @@ out_irq:
        }
 out:
        timer_of_cleanup(to);
+
        return ret;
 }
 
@@ -352,8 +359,6 @@ static int __init tegra20_init_rtc(struct device_node *np)
        if (ret)
                return ret;
 
-       clocksource_register_hz(&suspend_rtc_clocksource, 1000);
-
-       return 0;
+       return clocksource_register_hz(&suspend_rtc_clocksource, 1000);
 }
 TIMER_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);