Updates for time and clocksources:

- A fix for the idle and iowait time accounting vs. CPU hotplug.
     The time is reset on CPU hotplug which makes the accumulated
     systemwide time jump backwards.
 
  - Assorted fixes and improvements for clocksource/event drivers
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Merge tag 'timers-core-2024-01-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer updates from Thomas Gleixner:
 "Updates for time and clocksources:

   - A fix for the idle and iowait time accounting vs CPU hotplug.

     The time is reset on CPU hotplug which makes the accumulated
     systemwide time jump backwards.

   - Assorted fixes and improvements for clocksource/event drivers"

* tag 'timers-core-2024-01-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  tick-sched: Fix idle and iowait sleeptime accounting vs CPU hotplug
  clocksource/drivers/ep93xx: Fix error handling during probe
  clocksource/drivers/cadence-ttc: Fix some kernel-doc warnings
  clocksource/drivers/timer-ti-dm: Fix make W=n kerneldoc warnings
  clocksource/timer-riscv: Add riscv_clock_shutdown callback
  dt-bindings: timer: Add StarFive JH8100 clint
  dt-bindings: timer: thead,c900-aclint-mtimer: separate mtime and mtimecmp regs

Documentation/devicetree/bindings/timer/sifive,clint.yaml

@@ -33,6 +33,7 @@ properties:
               - sifive,fu540-c000-clint # SiFive FU540
               - starfive,jh7100-clint   # StarFive JH7100
               - starfive,jh7110-clint   # StarFive JH7110
+              - starfive,jh8100-clint   # StarFive JH8100
           - const: sifive,clint0        # SiFive CLINT v0 IP block
       - items:
           - enum:

Documentation/devicetree/bindings/timer/thead,c900-aclint-mtimer.yaml

@@ -17,7 +17,12 @@ properties:
       - const: thead,c900-aclint-mtimer
 
   reg:
-    maxItems: 1
+    items:
+      - description: MTIMECMP Registers
+
+  reg-names:
+    items:
+      - const: mtimecmp
 
   interrupts-extended:
     minItems: 1
@@ -28,6 +33,7 @@ additionalProperties: false
 required:
   - compatible
   - reg
+  - reg-names
   - interrupts-extended
 
 examples:
@@ -39,5 +45,6 @@ examples:
                             <&cpu3intc 7>,
                             <&cpu4intc 7>;
       reg = <0xac000000 0x00010000>;
+      reg-names = "mtimecmp";
     };
 ...

drivers/clocksource/timer-cadence-ttc.c

@@ -69,7 +69,7 @@
  * @base_addr:	Base address of timer
  * @freq:	Timer input clock frequency
  * @clk:	Associated clock source
- * @clk_rate_change_nb	Notifier block for clock rate changes
+ * @clk_rate_change_nb:	Notifier block for clock rate changes
  */
 struct ttc_timer {
 	void __iomem *base_addr;
@@ -134,7 +134,7 @@ static void ttc_set_interval(struct ttc_timer *timer,
  * @irq:	IRQ number of the Timer
  * @dev_id:	void pointer to the ttc_timer instance
  *
- * returns: Always IRQ_HANDLED - success
+ * Returns: Always IRQ_HANDLED - success
  **/
 static irqreturn_t ttc_clock_event_interrupt(int irq, void *dev_id)
 {
@@ -151,8 +151,9 @@ static irqreturn_t ttc_clock_event_interrupt(int irq, void *dev_id)
 
 /**
  * __ttc_clocksource_read - Reads the timer counter register
+ * @cs: &clocksource to read from
  *
- * returns: Current timer counter register value
+ * Returns: Current timer counter register value
  **/
 static u64 __ttc_clocksource_read(struct clocksource *cs)
 {
@@ -173,7 +174,7 @@ static u64 notrace ttc_sched_clock_read(void)
  * @cycles:	Timer interval ticks
  * @evt:	Address of clock event instance
  *
- * returns: Always 0 - success
+ * Returns: Always %0 - success
  **/
 static int ttc_set_next_event(unsigned long cycles,
 					struct clock_event_device *evt)
@@ -186,9 +187,12 @@ static int ttc_set_next_event(unsigned long cycles,
 }
 
 /**
- * ttc_set_{shutdown|oneshot|periodic} - Sets the state of timer
- *
+ * ttc_shutdown - Sets the state of timer
  * @evt:	Address of clock event instance
+ *
+ * Used for shutdown or oneshot.
+ *
+ * Returns: Always %0 - success
  **/
 static int ttc_shutdown(struct clock_event_device *evt)
 {
@@ -202,6 +206,12 @@ static int ttc_shutdown(struct clock_event_device *evt)
 	return 0;
 }
 
+/**
+ * ttc_set_periodic - Sets the state of timer
+ * @evt:	Address of clock event instance
+ *
+ * Returns: Always %0 - success
+ */
 static int ttc_set_periodic(struct clock_event_device *evt)
 {
 	struct ttc_timer_clockevent *ttce = to_ttc_timer_clkevent(evt);

drivers/clocksource/timer-ep93xx.c

@@ -155,9 +155,8 @@ static int __init ep93xx_timer_of_init(struct device_node *np)
 	ep93xx_tcu = tcu;
 
 	irq = irq_of_parse_and_map(np, 0);
-	if (irq == 0)
-		irq = -EINVAL;
-	if (irq < 0) {
+	if (!irq) {
+		ret = -EINVAL;
 		pr_err("EP93XX Timer Can't parse IRQ %d", irq);
 		goto out_free;
 	}

drivers/clocksource/timer-riscv.c

@@ -61,12 +61,19 @@ static int riscv_clock_next_event(unsigned long delta,
 	return 0;
 }
 
+static int riscv_clock_shutdown(struct clock_event_device *evt)
+{
+	riscv_clock_event_stop();
+	return 0;
+}
+
 static unsigned int riscv_clock_event_irq;
 static DEFINE_PER_CPU(struct clock_event_device, riscv_clock_event) = {
 	.name			= "riscv_timer_clockevent",
 	.features		= CLOCK_EVT_FEAT_ONESHOT,
 	.rating			= 100,
 	.set_next_event		= riscv_clock_next_event,
+	.set_state_shutdown	= riscv_clock_shutdown,
 };
 
 /*

drivers/clocksource/timer-ti-dm.c

@@ -183,7 +183,7 @@ static inline u32 dmtimer_read(struct dmtimer *timer, u32 reg)
  * dmtimer_write - write timer registers in posted and non-posted mode
  * @timer:      timer pointer over which write operation is to perform
  * @reg:        lowest byte holds the register offset
- * @value:      data to write into the register
+ * @val:        data to write into the register
  *
  * The posted mode bit is encoded in reg. Note that in posted mode, the write
  * pending bit must be checked. Otherwise a write on a register which has a
@@ -949,7 +949,7 @@ static int omap_dm_timer_set_int_enable(struct omap_dm_timer *cookie,
 
 /**
  * omap_dm_timer_set_int_disable - disable timer interrupts
- * @timer:	pointer to timer handle
+ * @cookie:	pointer to timer cookie
  * @mask:	bit mask of interrupts to be disabled
  *
  * Disables the specified timer interrupts for a timer.

kernel/time/tick-sched.c

@@ -1576,13 +1576,18 @@ void tick_setup_sched_timer(void)
 void tick_cancel_sched_timer(int cpu)
 {
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+	ktime_t idle_sleeptime, iowait_sleeptime;
 
 # ifdef CONFIG_HIGH_RES_TIMERS
 	if (ts->sched_timer.base)
 		hrtimer_cancel(&ts->sched_timer);
 # endif
 
+	idle_sleeptime = ts->idle_sleeptime;
+	iowait_sleeptime = ts->iowait_sleeptime;
 	memset(ts, 0, sizeof(*ts));
+	ts->idle_sleeptime = idle_sleeptime;
+	ts->iowait_sleeptime = iowait_sleeptime;
 }
 #endif