Merge tag 'timers-core-2022-10-05' of git://git.kernel.org/pub/scm/li…

…nux/kernel/git/tip/tip

Pull timer updates from Thomas Gleixner:
 "A boring time, timekeeping, timers update:

   - No core code changes

   - No new clocksource/event driver

   - Cleanup of the TI DM clocksource/event driver

   - The usual set of device tree binding updates

   - Small improvement, fixes and cleanups all over the place"

* tag 'timers-core-2022-10-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (22 commits)
  clocksource/drivers/arm_arch_timer: Fix CNTPCT_LO and CNTVCT_LO value
  clocksource/drivers/imx-sysctr: handle nxp,no-divider property
  dt-bindings: timer: nxp,sysctr-timer: add nxp,no-divider property
  clocksource/drivers/timer-ti-dm: Get clock in probe with devm_clk_get()
  clocksource/drivers/timer-ti-dm: Add flag to detect omap1
  clocksource/drivers/timer-ti-dm: Move struct omap_dm_timer fields to driver
  clocksource/drivers/timer-ti-dm: Use runtime PM directly and check errors
  clocksource/drivers/timer-ti-dm: Move private defines to the driver
  clocksource/drivers/timer-ti-dm: Simplify register access further
  clocksource/drivers/timer-ti-dm: Simplify register writes with dmtimer_write()
  clocksource/drivers/timer-ti-dm: Simplify register reads with dmtimer_read()
  clocksource/drivers/timer-ti-dm: Drop unused functions
  clocksource/drivers/timer-gxp: Add missing error handling in gxp_timer_probe
  clocksource/drivers/arm_arch_timer: Fix handling of ARM erratum 858921
  clocksource/drivers/exynos_mct: Enable building on ARTPEC
  clocksource/drivers/exynos_mct: Support local-timers property
  clocksource/drivers/exynos_mct: Support frc-shared property
  dt-bindings: timer: exynos4210-mct: Add ARTPEC-8 MCT support
  clocksource/drivers/sun4i: Add definition of clear interrupt
  clocksource/drivers/renesas-ostm: Add support for RZ/V2L SoC
  ...

Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt

@@ -25,6 +25,7 @@ Required properties:
 	For those SoCs that use SYST
 	* "mediatek,mt8183-timer" for MT8183 compatible timers (SYST)
 	* "mediatek,mt8186-timer" for MT8186 compatible timers (SYST)
+	* "mediatek,mt8188-timer" for MT8188 compatible timers (SYST)
 	* "mediatek,mt8192-timer" for MT8192 compatible timers (SYST)
 	* "mediatek,mt8195-timer" for MT8195 compatible timers (SYST)
 	* "mediatek,mt7629-timer" for MT7629 compatible timers (SYST)

Documentation/devicetree/bindings/timer/nxp,sysctr-timer.yaml

@@ -32,6 +32,10 @@ properties:
   clock-names:
     const: per
 
+  nxp,no-divider:
+    description: if present, means there is no internal base clk divider.
+    type: boolean
+
 required:
   - compatible
   - reg

Documentation/devicetree/bindings/timer/renesas,tmu.yaml

@@ -37,6 +37,7 @@ properties:
           - renesas,tmu-r8a77990 # R-Car E3
           - renesas,tmu-r8a77995 # R-Car D3
           - renesas,tmu-r8a779a0 # R-Car V3U
+          - renesas,tmu-r8a779f0 # R-Car S4-8
       - const: renesas,tmu
 
   reg:

Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.yaml

@@ -25,6 +25,7 @@ properties:
           - samsung,exynos4412-mct
       - items:
           - enum:
+              - axis,artpec8-mct
               - samsung,exynos3250-mct
               - samsung,exynos5250-mct
               - samsung,exynos5260-mct
@@ -45,6 +46,19 @@ properties:
   reg:
     maxItems: 1
 
+  samsung,frc-shared:
+    type: boolean
+    description: |
+      Indicates that the hardware requires that this processor share the
+      free-running counter with a different (main) processor.
+
+  samsung,local-timers:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 16
+    description: |
+      List of indices of local timers usable from this processor.
+
   interrupts:
     description: |
       Interrupts should be put in specific order. This is, the local timer
@@ -74,6 +88,17 @@ required:
   - reg
 
 allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - axis,artpec8-mct
+    then:
+      properties:
+        samsung,local-timers: false
+        samsung,frc-shared: false
   - if:
       properties:
         compatible:
@@ -101,6 +126,7 @@ allOf:
         compatible:
           contains:
             enum:
+              - axis,artpec8-mct
               - samsung,exynos5260-mct
               - samsung,exynos5420-mct
               - samsung,exynos5433-mct

drivers/clocksource/Kconfig

@@ -434,7 +434,7 @@ config ATMEL_TCB_CLKSRC
 config CLKSRC_EXYNOS_MCT
 	bool "Exynos multi core timer driver" if COMPILE_TEST
 	depends on ARM || ARM64
-	depends on ARCH_EXYNOS || COMPILE_TEST
+	depends on ARCH_ARTPEC || ARCH_EXYNOS || COMPILE_TEST
 	help
 	  Support for Multi Core Timer controller on Exynos SoCs.
 

drivers/clocksource/arm_arch_timer.c

@@ -44,8 +44,8 @@
 #define CNTACR_RWVT	BIT(4)
 #define CNTACR_RWPT	BIT(5)
 
-#define CNTVCT_LO	0x00
-#define CNTPCT_LO	0x08
+#define CNTPCT_LO	0x00
+#define CNTVCT_LO	0x08
 #define CNTFRQ		0x10
 #define CNTP_CVAL_LO	0x20
 #define CNTP_CTL	0x2c
@@ -473,6 +473,8 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
 		.desc = "ARM erratum 858921",
 		.read_cntpct_el0 = arm64_858921_read_cntpct_el0,
 		.read_cntvct_el0 = arm64_858921_read_cntvct_el0,
+		.set_next_event_phys = erratum_set_next_event_phys,
+		.set_next_event_virt = erratum_set_next_event_virt,
 	},
 #endif
 #ifdef CONFIG_SUN50I_ERRATUM_UNKNOWN1

drivers/clocksource/exynos_mct.c

@@ -33,7 +33,7 @@
 #define EXYNOS4_MCT_G_INT_ENB		EXYNOS4_MCTREG(0x248)
 #define EXYNOS4_MCT_G_WSTAT		EXYNOS4_MCTREG(0x24C)
 #define _EXYNOS4_MCT_L_BASE		EXYNOS4_MCTREG(0x300)
-#define EXYNOS4_MCT_L_BASE(x)		(_EXYNOS4_MCT_L_BASE + (0x100 * x))
+#define EXYNOS4_MCT_L_BASE(x)		(_EXYNOS4_MCT_L_BASE + (0x100 * (x)))
 #define EXYNOS4_MCT_L_MASK		(0xffffff00)
 
 #define MCT_L_TCNTB_OFFSET		(0x00)
@@ -66,6 +66,8 @@
 #define MCT_L0_IRQ	4
 /* Max number of IRQ as per DT binding document */
 #define MCT_NR_IRQS	20
+/* Max number of local timers */
+#define MCT_NR_LOCAL	(MCT_NR_IRQS - MCT_L0_IRQ)
 
 enum {
 	MCT_INT_SPI,
@@ -233,9 +235,16 @@ static cycles_t exynos4_read_current_timer(void)
 }
 #endif
 
-static int __init exynos4_clocksource_init(void)
+static int __init exynos4_clocksource_init(bool frc_shared)
 {
-	exynos4_mct_frc_start();
+	/*
+	 * When the frc is shared, the main processer should have already
+	 * turned it on and we shouldn't be writing to TCON.
+	 */
+	if (frc_shared)
+		mct_frc.resume = NULL;
+	else
+		exynos4_mct_frc_start();
 
 #if defined(CONFIG_ARM)
 	exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer;
@@ -449,7 +458,6 @@ static int exynos4_mct_starting_cpu(unsigned int cpu)
 		per_cpu_ptr(&percpu_mct_tick, cpu);
 	struct clock_event_device *evt = &mevt->evt;
 
-	mevt->base = EXYNOS4_MCT_L_BASE(cpu);
 	snprintf(mevt->name, sizeof(mevt->name), "mct_tick%d", cpu);
 
 	evt->name = mevt->name;
@@ -520,8 +528,17 @@ static int __init exynos4_timer_resources(struct device_node *np)
 	return 0;
 }
 
+/**
+ * exynos4_timer_interrupts - initialize MCT interrupts
+ * @np: device node for MCT
+ * @int_type: interrupt type, MCT_INT_PPI or MCT_INT_SPI
+ * @local_idx: array mapping CPU numbers to local timer indices
+ * @nr_local: size of @local_idx array
+ */
 static int __init exynos4_timer_interrupts(struct device_node *np,
-					   unsigned int int_type)
+					   unsigned int int_type,
+					   const u32 *local_idx,
+					   size_t nr_local)
 {
 	int nr_irqs, i, err, cpu;
 
@@ -554,13 +571,21 @@ static int __init exynos4_timer_interrupts(struct device_node *np,
 	} else {
 		for_each_possible_cpu(cpu) {
 			int mct_irq;
+			unsigned int irq_idx;
 			struct mct_clock_event_device *pcpu_mevt =
 				per_cpu_ptr(&percpu_mct_tick, cpu);
 
+			if (cpu >= nr_local) {
+				err = -EINVAL;
+				goto out_irq;
+			}
+
+			irq_idx = MCT_L0_IRQ + local_idx[cpu];
+
 			pcpu_mevt->evt.irq = -1;
-			if (MCT_L0_IRQ + cpu >= ARRAY_SIZE(mct_irqs))
+			if (irq_idx >= ARRAY_SIZE(mct_irqs))
 				break;
-			mct_irq = mct_irqs[MCT_L0_IRQ + cpu];
+			mct_irq = mct_irqs[irq_idx];
 
 			irq_set_status_flags(mct_irq, IRQ_NOAUTOEN);
 			if (request_irq(mct_irq,
@@ -576,6 +601,17 @@ static int __init exynos4_timer_interrupts(struct device_node *np,
 		}
 	}
 
+	for_each_possible_cpu(cpu) {
+		struct mct_clock_event_device *mevt = per_cpu_ptr(&percpu_mct_tick, cpu);
+
+		if (cpu >= nr_local) {
+			err = -EINVAL;
+			goto out_irq;
+		}
+
+		mevt->base = EXYNOS4_MCT_L_BASE(local_idx[cpu]);
+	}
+
 	/* Install hotplug callbacks which configure the timer on this CPU */
 	err = cpuhp_setup_state(CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
 				"clockevents/exynos4/mct_timer:starting",
@@ -605,20 +641,49 @@ static int __init exynos4_timer_interrupts(struct device_node *np,
 
 static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
 {
+	bool frc_shared = of_property_read_bool(np, "samsung,frc-shared");
+	u32 local_idx[MCT_NR_LOCAL] = {0};
+	int nr_local;
 	int ret;
 
+	nr_local = of_property_count_u32_elems(np, "samsung,local-timers");
+	if (nr_local == 0)
+		return -EINVAL;
+	if (nr_local > 0) {
+		if (nr_local > ARRAY_SIZE(local_idx))
+			return -EINVAL;
+
+		ret = of_property_read_u32_array(np, "samsung,local-timers",
+						 local_idx, nr_local);
+		if (ret)
+			return ret;
+	} else {
+		int i;
+
+		nr_local = ARRAY_SIZE(local_idx);
+		for (i = 0; i < nr_local; i++)
+			local_idx[i] = i;
+	}
+
 	ret = exynos4_timer_resources(np);
 	if (ret)
 		return ret;
 
-	ret = exynos4_timer_interrupts(np, int_type);
+	ret = exynos4_timer_interrupts(np, int_type, local_idx, nr_local);
 	if (ret)
 		return ret;
 
-	ret = exynos4_clocksource_init();
+	ret = exynos4_clocksource_init(frc_shared);
 	if (ret)
 		return ret;
 
+	/*
+	 * When the FRC is shared with a main processor, this secondary
+	 * processor cannot use the global comparator.
+	 */
+	if (frc_shared)
+		return ret;
+
 	return exynos4_clockevent_init();
 }
 

drivers/clocksource/renesas-ostm.c

@@ -224,7 +224,7 @@ static int __init ostm_init(struct device_node *np)
 
 TIMER_OF_DECLARE(ostm, "renesas,ostm", ostm_init);
 
-#ifdef CONFIG_ARCH_R9A07G044
+#ifdef CONFIG_ARCH_RZG2L
 static int __init ostm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;

drivers/clocksource/timer-gxp.c

@@ -171,6 +171,7 @@ static int gxp_timer_probe(struct platform_device *pdev)
 {
 	struct platform_device *gxp_watchdog_device;
 	struct device *dev = &pdev->dev;
+	int ret;
 
 	if (!gxp_timer) {
 		pr_err("Gxp Timer not initialized, cannot create watchdog");
@@ -187,7 +188,11 @@ static int gxp_timer_probe(struct platform_device *pdev)
 	gxp_watchdog_device->dev.platform_data = gxp_timer->counter;
 	gxp_watchdog_device->dev.parent = dev;
 
-	return platform_device_add(gxp_watchdog_device);
+	ret = platform_device_add(gxp_watchdog_device);
+	if (ret)
+		platform_device_put(gxp_watchdog_device);
+
+	return ret;
 }
 
 static const struct of_device_id gxp_timer_of_match[] = {

drivers/clocksource/timer-imx-sysctr.c

@@ -134,8 +134,10 @@ static int __init sysctr_timer_init(struct device_node *np)
 	if (ret)
 		return ret;
 
-	/* system counter clock is divided by 3 internally */
-	to_sysctr.of_clk.rate /= SYS_CTR_CLK_DIV;
+	if (!of_property_read_bool(np, "nxp,no-divider")) {
+		/* system counter clock is divided by 3 internally */
+		to_sysctr.of_clk.rate /= SYS_CTR_CLK_DIV;
+	}
 
 	sys_ctr_base = timer_of_base(&to_sysctr);
 	cmpcr = readl(sys_ctr_base + CMPCR);

drivers/clocksource/timer-sun4i.c

@@ -26,6 +26,7 @@
 #define TIMER_IRQ_EN_REG	0x00
 #define TIMER_IRQ_EN(val)		BIT(val)
 #define TIMER_IRQ_ST_REG	0x04
+#define TIMER_IRQ_CLEAR(val)		BIT(val)
 #define TIMER_CTL_REG(val)	(0x10 * val + 0x10)
 #define TIMER_CTL_ENABLE		BIT(0)
 #define TIMER_CTL_RELOAD		BIT(1)
@@ -123,7 +124,7 @@ static int sun4i_clkevt_next_event(unsigned long evt,
 
 static void sun4i_timer_clear_interrupt(void __iomem *base)
 {
-	writel(TIMER_IRQ_EN(0), base + TIMER_IRQ_ST_REG);
+	writel(TIMER_IRQ_CLEAR(0), base + TIMER_IRQ_ST_REG);
 }
 
 static irqreturn_t sun4i_timer_interrupt(int irq, void *dev_id)