- Use 64-bits for timer compensation for IoT usage where the suspend

time is much longer than what 32-bits can provide (Enlin Mu)
 
 - Add delay support on sp804 for ARM32 platforms (Stephen Eta Zhou)
 
 - Fix missing resource release on error in the probe path of in the
   ralink driver (Haotian Zhang)
 
 - Fix double deregistration on probe failure in the NXP STM driver
   (Johan Hovold)
 
 - Disable runtime PM for the Renesas SH CMT timer because it is
   incompatible with PREEMPT_RT=y (Niklas Söderlund)
 
 - Fix section mismatches in the NXP STM driver (Johan Hovold)
 
 - Preventing unbinding the NXP PIT, STM and MMIO ARM Arch timers as
   the code does not suppport bind/unbind (Johan Hovold)
 
 - Use the clocksource instead of ticks on the RDA8810PL platform
   (Enlin Mu)
 
 - Drop the unused module alias for the STM32-LP (Johan Hovold)
 
 - Add Realtek system timer driver (Hao-Wen Ting)
 -----BEGIN PGP SIGNATURE-----
 
 iQEzBAABCAAdFiEEGn3N4YVz0WNVyHskqDIjiipP6E8FAmkm6t4ACgkQqDIjiipP
 6E8xqQgAlXnV3vRJmEbjd3ILECvbKMLI2haHV2eA+75P+DvbfriL+ePMHkfkOPI6
 CC5UhCSy410cQLO88tzy5+9K8Po2KnHxb+lVS2P6zzcdefL5ZWMZ9Q+CAOwSo1s9
 An1A4nUgcTB52mAR+jlz++SF1VV/fMvskMrtiTg8bSIScSc+xi4sEC3GaZR09qSG
 RODtzmVsyeoHQ1u6ziRJen8GzpX1q6vUP0eAAr+vXqTUXdCuUL8P20h2mwzxPJWH
 mFo53OuKVbTMOoY1Av7euvO1ZZ1tsHsS4NxJfD1qatq+eh1As1dxYodB4dp44qZt
 jjnVuj0QrE40VB6EnHAA4kKb6WWpow==
 =WXsR
 -----END PGP SIGNATURE-----

Merge tag 'timers-v6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daniel.lezcano/linux into timers/clocksource

Pull clocksource/event changes from Daniel Lezcano:

    - Use 64-bits for timer compensation for IoT usage where the suspend
      time is much longer than what 32-bits can provide (Enlin Mu)

    - Add delay support on sp804 for ARM32 platforms (Stephen Eta Zhou)

    - Fix missing resource release on error in the probe path of in the
      ralink driver (Haotian Zhang)

    - Fix double deregistration on probe failure in the NXP STM driver
      (Johan Hovold)

    - Disable runtime PM for the Renesas SH CMT timer because it is
      incompatible with PREEMPT_RT=y (Niklas Söderlund)

    - Fix section mismatches in the NXP STM driver (Johan Hovold)

    - Preventing unbinding the NXP PIT, STM and MMIO ARM Arch timers as
      the code does not suppport bind/unbind (Johan Hovold)

    - Use the clocksource instead of ticks on the RDA8810PL platform
      (Enlin Mu)

    - Drop the unused module alias for the STM32-LP (Johan Hovold)

    - Add Realtek system timer driver (Hao-Wen Ting)

Link: https://lore.kernel.org/all/9303b790-28d4-4bd9-b01d-28fb05493596@linaro.org

Documentation/devicetree/bindings/timer/realtek,rtd1625-systimer.yaml

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/realtek,rtd1625-systimer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Realtek System Timer
+
+maintainers:
+  - Hao-Wen Ting <haowen.ting@realtek.com>
+
+description:
+  The Realtek SYSTIMER (System Timer) is a 64-bit global hardware counter operating
+  at a fixed 1MHz frequency. Thanks to its compare match interrupt capability,
+  the timer natively supports oneshot mode for tick broadcast functionality.
+
+properties:
+  compatible:
+    oneOf:
+      - const: realtek,rtd1625-systimer
+      - items:
+          - const: realtek,rtd1635-systimer
+          - const: realtek,rtd1625-systimer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    timer@89420 {
+        compatible = "realtek,rtd1635-systimer",
+                     "realtek,rtd1625-systimer";
+        reg = <0x89420 0x18>;
+        interrupts = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
+    };

MAINTAINERS

@@ -21669,6 +21669,11 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/spi/realtek,rtl9301-snand.yaml
 F:	drivers/spi/spi-realtek-rtl-snand.c
 
+REALTEK SYSTIMER DRIVER
+M:	Hao-Wen Ting <haowen.ting@realtek.com>
+S:	Maintained
+F:	drivers/clocksource/timer-realtek.c
+
 REALTEK WIRELESS DRIVER (rtlwifi family)
 M:	Ping-Ke Shih <pkshih@realtek.com>
 L:	linux-wireless@vger.kernel.org

drivers/clocksource/Kconfig

@@ -782,4 +782,15 @@ config NXP_STM_TIMER
           Enables the support for NXP System Timer Module found in the
           s32g NXP platform series.
 
+config RTK_SYSTIMER
+	bool "Realtek SYSTIMER support"
+	depends on ARM || ARM64
+	depends on ARCH_REALTEK || COMPILE_TEST
+	select TIMER_OF
+	help
+	  This option enables the driver that registers the global 1 MHz hardware
+	  counter as a clock event device on Realtek SoCs. Make sure to enable
+	  this option only when building for a Realtek platform or for compilation
+	  testing.
+
 endmenu

drivers/clocksource/Makefile

@@ -95,3 +95,4 @@ obj-$(CONFIG_CLKSRC_LOONGSON1_PWM)	+= timer-loongson1-pwm.o
 obj-$(CONFIG_EP93XX_TIMER)		+= timer-ep93xx.o
 obj-$(CONFIG_RALINK_TIMER)		+= timer-ralink.o
 obj-$(CONFIG_NXP_STM_TIMER)		+= timer-nxp-stm.o
+obj-$(CONFIG_RTK_SYSTIMER)		+= timer-realtek.o

drivers/clocksource/arm_arch_timer_mmio.c

@@ -426,6 +426,7 @@ static struct platform_driver arch_timer_mmio_drv = {
 	.driver	= {
 		.name = "arch-timer-mmio",
 		.of_match_table	= arch_timer_mmio_of_table,
+		.suppress_bind_attrs = true,
 	},
 	.probe	= arch_timer_mmio_probe,
 };
@@ -434,6 +435,7 @@ builtin_platform_driver(arch_timer_mmio_drv);
 static struct platform_driver arch_timer_mmio_acpi_drv = {
 	.driver	= {
 		.name = "gtdt-arm-mmio-timer",
+		.suppress_bind_attrs = true,
 	},
 	.probe	= arch_timer_mmio_probe,
 };

drivers/clocksource/sh_cmt.c

@@ -355,14 +355,6 @@ static int sh_cmt_enable(struct sh_cmt_channel *ch)
 
 	dev_pm_syscore_device(&ch->cmt->pdev->dev, true);
 
-	/* enable clock */
-	ret = clk_enable(ch->cmt->clk);
-	if (ret) {
-		dev_err(&ch->cmt->pdev->dev, "ch%u: cannot enable clock\n",
-			ch->index);
-		goto err0;
-	}
-
 	/* make sure channel is disabled */
 	sh_cmt_start_stop_ch(ch, 0);
 
@@ -384,19 +376,12 @@ static int sh_cmt_enable(struct sh_cmt_channel *ch)
 	if (ret || sh_cmt_read_cmcnt(ch)) {
 		dev_err(&ch->cmt->pdev->dev, "ch%u: cannot clear CMCNT\n",
 			ch->index);
-		ret = -ETIMEDOUT;
+		return -ETIMEDOUT;
-		goto err1;
 	}
 
 	/* enable channel */
 	sh_cmt_start_stop_ch(ch, 1);
 	return 0;
- err1:
-	/* stop clock */
-	clk_disable(ch->cmt->clk);
-
- err0:
-	return ret;
 }
 
 static void sh_cmt_disable(struct sh_cmt_channel *ch)
@@ -407,9 +392,6 @@ static void sh_cmt_disable(struct sh_cmt_channel *ch)
 	/* disable interrupts in CMT block */
 	sh_cmt_write_cmcsr(ch, 0);
 
-	/* stop clock */
-	clk_disable(ch->cmt->clk);
-
 	dev_pm_syscore_device(&ch->cmt->pdev->dev, false);
 }
 
@@ -583,8 +565,6 @@ static int sh_cmt_start_clocksource(struct sh_cmt_channel *ch)
 	int ret = 0;
 	unsigned long flags;
 
-	pm_runtime_get_sync(&ch->cmt->pdev->dev);
-
 	raw_spin_lock_irqsave(&ch->lock, flags);
 
 	if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE)))
@@ -619,8 +599,6 @@ static void sh_cmt_stop_clocksource(struct sh_cmt_channel *ch)
 		sh_cmt_disable(ch);
 
 	raw_spin_unlock_irqrestore(&ch->lock, flags);
-
-	pm_runtime_put(&ch->cmt->pdev->dev);
 }
 
 static int sh_cmt_start_clockevent(struct sh_cmt_channel *ch)
@@ -630,10 +608,8 @@ static int sh_cmt_start_clockevent(struct sh_cmt_channel *ch)
 
 	raw_spin_lock_irqsave(&ch->lock, flags);
 
-	if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) {
+	if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE)))
-		pm_runtime_get_sync(&ch->cmt->pdev->dev);
 		ret = sh_cmt_enable(ch);
-	}
 
 	if (ret)
 		goto out;
@@ -656,10 +632,8 @@ static void sh_cmt_stop_clockevent(struct sh_cmt_channel *ch)
 
 	ch->flags &= ~FLAG_CLOCKEVENT;
 
-	if (f && !(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) {
+	if (f && !(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE)))
 		sh_cmt_disable(ch);
-		pm_runtime_put(&ch->cmt->pdev->dev);
-	}
 
 	/* adjust the timeout to maximum if only clocksource left */
 	if (ch->flags & FLAG_CLOCKSOURCE)
@@ -1134,8 +1108,6 @@ static int sh_cmt_setup(struct sh_cmt_device *cmt, struct platform_device *pdev)
 		mask &= ~(1 << hwidx);
 	}
 
-	clk_disable(cmt->clk);
-
 	platform_set_drvdata(pdev, cmt);
 
 	return 0;
@@ -1183,8 +1155,6 @@ static int sh_cmt_probe(struct platform_device *pdev)
  out:
 	if (cmt->has_clockevent || cmt->has_clocksource)
 		pm_runtime_irq_safe(&pdev->dev);
-	else
-		pm_runtime_idle(&pdev->dev);
 
 	return 0;
 }

drivers/clocksource/timer-nxp-pit.c

@@ -374,9 +374,10 @@ static struct platform_driver nxp_pit_driver = {
 	.driver = {
 		.name = "nxp-pit",
 		.of_match_table = pit_timer_of_match,
+		.suppress_bind_attrs = true,
 	},
 	.probe = pit_timer_probe,
 };
-module_platform_driver(nxp_pit_driver);
+builtin_platform_driver(nxp_pit_driver);
 
 TIMER_OF_DECLARE(vf610, "fsl,vf610-pit", pit_timer_init);

drivers/clocksource/timer-nxp-stm.c

@@ -177,14 +177,14 @@ static void nxp_stm_clocksource_resume(struct clocksource *cs)
 	nxp_stm_clocksource_enable(cs);
 }
 
-static void __init devm_clocksource_unregister(void *data)
+static void devm_clocksource_unregister(void *data)
 {
 	struct stm_timer *stm_timer = data;
 
 	clocksource_unregister(&stm_timer->cs);
 }
 
-static int __init nxp_stm_clocksource_init(struct device *dev, struct stm_timer *stm_timer,
+static int nxp_stm_clocksource_init(struct device *dev, struct stm_timer *stm_timer,
 				    const char *name, void __iomem *base, struct clk *clk)
 {
 	int ret;
@@ -208,10 +208,8 @@ static int __init nxp_stm_clocksource_init(struct device *dev, struct stm_timer
 		return ret;
 
 	ret = devm_add_action_or_reset(dev, devm_clocksource_unregister, stm_timer);
-	if (ret) {
+	if (ret)
-		clocksource_unregister(&stm_timer->cs);
 		return ret;
-	}
 
 	stm_sched_clock = stm_timer;
 
@@ -298,7 +296,7 @@ static void nxp_stm_clockevent_resume(struct clock_event_device *ced)
 	nxp_stm_module_get(stm_timer);
 }
 
-static int __init nxp_stm_clockevent_per_cpu_init(struct device *dev, struct stm_timer *stm_timer,
+static int nxp_stm_clockevent_per_cpu_init(struct device *dev, struct stm_timer *stm_timer,
 					   const char *name, void __iomem *base, int irq,
 					   struct clk *clk, int cpu)
 {
@@ -388,7 +386,7 @@ static irqreturn_t nxp_stm_module_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int __init nxp_stm_timer_probe(struct platform_device *pdev)
+static int nxp_stm_timer_probe(struct platform_device *pdev)
 {
 	struct stm_timer *stm_timer;
 	struct device *dev = &pdev->dev;
@@ -484,14 +482,15 @@ static const struct of_device_id nxp_stm_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, nxp_stm_of_match);
 
-static struct platform_driver nxp_stm_probe = {
+static struct platform_driver nxp_stm_driver = {
 	.probe	= nxp_stm_timer_probe,
 	.driver	= {
 		.name		= "nxp-stm",
 		.of_match_table	= nxp_stm_of_match,
+		.suppress_bind_attrs = true,
 	},
 };
-module_platform_driver(nxp_stm_probe);
+builtin_platform_driver(nxp_stm_driver);
 
 MODULE_DESCRIPTION("NXP System Timer Module driver");
 MODULE_LICENSE("GPL");

drivers/clocksource/timer-ralink.c

@@ -130,14 +130,15 @@ static int __init ralink_systick_init(struct device_node *np)
 	systick.dev.irq = irq_of_parse_and_map(np, 0);
 	if (!systick.dev.irq) {
 		pr_err("%pOFn: request_irq failed", np);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_iounmap;
 	}
 
 	ret = clocksource_mmio_init(systick.membase + SYSTICK_COUNT, np->name,
 				    SYSTICK_FREQ, 301, 16,
 				    clocksource_mmio_readl_up);
 	if (ret)
-		return ret;
+		goto err_free_irq;
 
 	clockevents_register_device(&systick.dev);
 
@@ -145,6 +146,12 @@ static int __init ralink_systick_init(struct device_node *np)
 			np, systick.dev.mult, systick.dev.shift);
 
 	return 0;
+
+err_free_irq:
+	irq_dispose_mapping(systick.dev.irq);
+err_iounmap:
+	iounmap(systick.membase);
+	return ret;
 }
 
 TIMER_OF_DECLARE(systick, "ralink,cevt-systick", ralink_systick_init);

drivers/clocksource/timer-rda.c

@@ -13,6 +13,7 @@
 
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/sched_clock.h>
 
 #include "timer-of.h"
 
@@ -153,7 +154,7 @@ static struct timer_of rda_ostimer_of = {
 	},
 };
 
-static u64 rda_hwtimer_read(struct clocksource *cs)
+static u64 rda_hwtimer_clocksource_read(void)
 {
 	void __iomem *base = timer_of_base(&rda_ostimer_of);
 	u32 lo, hi;
@@ -167,6 +168,11 @@ static u64 rda_hwtimer_read(struct clocksource *cs)
 	return ((u64)hi << 32) | lo;
 }
 
+static u64 rda_hwtimer_read(struct clocksource *cs)
+{
+	return rda_hwtimer_clocksource_read();
+}
+
 static struct clocksource rda_hwtimer_clocksource = {
 	.name           = "rda-timer",
 	.rating         = 400,
@@ -185,6 +191,7 @@ static int __init rda_timer_init(struct device_node *np)
 		return ret;
 
 	clocksource_register_hz(&rda_hwtimer_clocksource, rate);
+	sched_clock_register(rda_hwtimer_clocksource_read, 64, rate);
 
 	clockevents_config_and_register(&rda_ostimer_of.clkevt, rate,
 					0x2, UINT_MAX);

drivers/clocksource/timer-realtek.c

@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 Realtek Semiconductor Corp.
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/irqflags.h>
+#include <linux/interrupt.h>
+#include "timer-of.h"
+
+#define ENBL 1
+#define DSBL 0
+
+#define SYSTIMER_RATE 1000000
+#define SYSTIMER_MIN_DELTA 0x64
+#define SYSTIMER_MAX_DELTA ULONG_MAX
+
+/* SYSTIMER Register Offset (RTK Internal Use) */
+#define TS_LW_OFST 0x0
+#define TS_HW_OFST 0x4
+#define TS_CMP_VAL_LW_OFST 0x8
+#define TS_CMP_VAL_HW_OFST 0xC
+#define TS_CMP_CTRL_OFST 0x10
+#define TS_CMP_STAT_OFST 0x14
+
+/* SYSTIMER CMP CTRL REG Mask */
+#define TS_CMP_EN_MASK 0x1
+#define TS_WR_EN0_MASK 0x2
+
+static void __iomem *systimer_base;
+
+static u64 rtk_ts64_read(void)
+{
+	u32 low, high;
+	u64 ts;
+
+	/* Caution: Read LSB word (TS_LW_OFST) first then MSB (TS_HW_OFST) */
+	low = readl(systimer_base + TS_LW_OFST);
+	high = readl(systimer_base + TS_HW_OFST);
+	ts = ((u64)high << 32) | low;
+
+	return ts;
+}
+
+static void rtk_cmp_value_write(u64 value)
+{
+	u32 high, low;
+
+	low = value & 0xFFFFFFFF;
+	high = value >> 32;
+
+	writel(high, systimer_base + TS_CMP_VAL_HW_OFST);
+	writel(low, systimer_base + TS_CMP_VAL_LW_OFST);
+}
+
+static inline void rtk_cmp_en_write(bool cmp_en)
+{
+	u32 val;
+
+	val = TS_WR_EN0_MASK;
+	if (cmp_en == ENBL)
+		val |= TS_CMP_EN_MASK;
+
+	writel(val, systimer_base + TS_CMP_CTRL_OFST);
+}
+
+static int rtk_syst_clkevt_next_event(unsigned long cycles, struct clock_event_device *clkevt)
+{
+	u64 cmp_val;
+
+	rtk_cmp_en_write(DSBL);
+	cmp_val = rtk_ts64_read();
+
+	/* Set CMP value to current timestamp plus delta_us */
+	rtk_cmp_value_write(cmp_val + cycles);
+	rtk_cmp_en_write(ENBL);
+	return 0;
+}
+
+static irqreturn_t rtk_ts_match_intr_handler(int irq, void *dev_id)
+{
+	struct clock_event_device *clkevt = dev_id;
+	void __iomem *reg_base;
+	u32 val;
+
+	/* Disable TS CMP Match */
+	rtk_cmp_en_write(DSBL);
+
+	/* Clear TS CMP INTR */
+	reg_base = systimer_base + TS_CMP_STAT_OFST;
+	val = readl(reg_base) & TS_CMP_EN_MASK;
+	writel(val | TS_CMP_EN_MASK, reg_base);
+	clkevt->event_handler(clkevt);
+
+	return IRQ_HANDLED;
+}
+
+static int rtk_syst_shutdown(struct clock_event_device *clkevt)
+{
+	void __iomem *reg_base;
+	u64 cmp_val = 0;
+
+	/* Disable TS CMP Match */
+	rtk_cmp_en_write(DSBL);
+	/* Set compare value to 0 */
+	rtk_cmp_value_write(cmp_val);
+
+	/* Clear TS CMP INTR */
+	reg_base = systimer_base + TS_CMP_STAT_OFST;
+	writel(TS_CMP_EN_MASK, reg_base);
+	return 0;
+}
+
+static struct timer_of rtk_timer_to = {
+	.flags = TIMER_OF_IRQ | TIMER_OF_BASE,
+
+	.clkevt = {
+		.name			= "rtk-clkevt",
+		.rating			= 300,
+		.cpumask		= cpu_possible_mask,
+		.features		= CLOCK_EVT_FEAT_DYNIRQ |
+					  CLOCK_EVT_FEAT_ONESHOT,
+		.set_next_event		= rtk_syst_clkevt_next_event,
+		.set_state_oneshot	= rtk_syst_shutdown,
+		.set_state_shutdown	= rtk_syst_shutdown,
+	},
+
+	.of_irq = {
+		.flags			= IRQF_TIMER | IRQF_IRQPOLL,
+		.handler		= rtk_ts_match_intr_handler,
+	},
+};
+
+static int __init rtk_systimer_init(struct device_node *node)
+{
+	int ret;
+
+	ret = timer_of_init(node, &rtk_timer_to);
+	if (ret)
+		return ret;
+
+	systimer_base = timer_of_base(&rtk_timer_to);
+	clockevents_config_and_register(&rtk_timer_to.clkevt, SYSTIMER_RATE,
+					SYSTIMER_MIN_DELTA, SYSTIMER_MAX_DELTA);
+
+	return 0;
+}
+
+TIMER_OF_DECLARE(rtk_systimer, "realtek,rtd1625-systimer", rtk_systimer_init);

drivers/clocksource/timer-sp804.c

@@ -21,6 +21,10 @@
 #include <linux/of_irq.h>
 #include <linux/sched_clock.h>
 
+#ifdef CONFIG_ARM
+#include <linux/delay.h>
+#endif
+
 #include "timer-sp.h"
 
 /* Hisilicon 64-bit timer(a variant of ARM SP804) */
@@ -102,6 +106,23 @@ static u64 notrace sp804_read(void)
 	return ~readl_relaxed(sched_clkevt->value);
 }
 
+#ifdef CONFIG_ARM
+static struct delay_timer delay;
+static unsigned long sp804_read_delay_timer_read(void)
+{
+	return sp804_read();
+}
+
+static void sp804_register_delay_timer(int freq)
+{
+	delay.freq = freq;
+	delay.read_current_timer = sp804_read_delay_timer_read;
+	register_current_timer_delay(&delay);
+}
+#else
+static inline void sp804_register_delay_timer(int freq) {}
+#endif
+
 static int __init sp804_clocksource_and_sched_clock_init(void __iomem *base,
 							 const char *name,
 							 struct clk *clk,
@@ -114,6 +135,8 @@ static int __init sp804_clocksource_and_sched_clock_init(void __iomem *base,
 	if (rate < 0)
 		return -EINVAL;
 
+	sp804_register_delay_timer(rate);
+
 	clkevt = sp804_clkevt_get(base);
 
 	writel(0, clkevt->ctrl);
@@ -318,6 +341,7 @@ static int __init sp804_of_init(struct device_node *np, struct sp804_timer *time
 		if (ret)
 			goto err;
 	}
+
 	initialized = true;
 
 	return 0;

drivers/clocksource/timer-sprd.c

@@ -30,6 +30,7 @@
 #define TIMER_VALUE_SHDW_HI	0x1c
 
 #define TIMER_VALUE_LO_MASK	GENMASK(31, 0)
+#define TIMER_VALUE_HI_MASK	GENMASK(31, 0)
 
 static void sprd_timer_enable(void __iomem *base, u32 flag)
 {
@@ -162,15 +163,26 @@ static struct timer_of suspend_to = {
 
 static u64 sprd_suspend_timer_read(struct clocksource *cs)
 {
-	return ~(u64)readl_relaxed(timer_of_base(&suspend_to) +
+	u32 lo, hi;
-				   TIMER_VALUE_SHDW_LO) & cs->mask;
+
+	do {
+		hi = readl_relaxed(timer_of_base(&suspend_to) +
+				   TIMER_VALUE_SHDW_HI);
+		lo = readl_relaxed(timer_of_base(&suspend_to) +
+				   TIMER_VALUE_SHDW_LO);
+	} while (hi != readl_relaxed(timer_of_base(&suspend_to) + TIMER_VALUE_SHDW_HI));
+
+	return ~(((u64)hi << 32) | lo);
 }
 
 static int sprd_suspend_timer_enable(struct clocksource *cs)
 {
-	sprd_timer_update_counter(timer_of_base(&suspend_to),
+	writel_relaxed(TIMER_VALUE_LO_MASK,
-				  TIMER_VALUE_LO_MASK);
+		       timer_of_base(&suspend_to) + TIMER_LOAD_LO);
-	sprd_timer_enable(timer_of_base(&suspend_to), TIMER_CTL_PERIOD_MODE);
+	writel_relaxed(TIMER_VALUE_HI_MASK,
+		       timer_of_base(&suspend_to) + TIMER_LOAD_HI);
+	sprd_timer_enable(timer_of_base(&suspend_to),
+			  TIMER_CTL_PERIOD_MODE|TIMER_CTL_64BIT_WIDTH);
 
 	return 0;
 }
@@ -186,7 +198,7 @@ static struct clocksource suspend_clocksource = {
 	.read	= sprd_suspend_timer_read,
 	.enable = sprd_suspend_timer_enable,
 	.disable = sprd_suspend_timer_disable,
-	.mask	= CLOCKSOURCE_MASK(32),
+	.mask	= CLOCKSOURCE_MASK(64),
 	.flags	= CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP,
 };
 

drivers/clocksource/timer-stm32-lp.c

@@ -289,5 +289,4 @@ static struct platform_driver stm32_clkevent_lp_driver = {
 };
 module_platform_driver(stm32_clkevent_lp_driver);
 
-MODULE_ALIAS("platform:stm32-lptimer-timer");
 MODULE_DESCRIPTION("STMicroelectronics STM32 clockevent low power driver");