[PATCH v1 0/3] Add the System Timer Module counter

[PATCH v1 0/3] Add the System Timer Module counter

[Daniel Lezcano]

The NXP S32 family provides a System Timer Module (STM), a 32-bit
free-running counter clocked from a peripheral clock. The STM includes
a prescaler and one or more compare channels generating optional
interrupts. When used as a generic hardware counter, only the main
free-running counter is required, while the compare channels are
typically unused.

On S32G2 devices, the STM is exposed as a simple counter block that
can operate continuously and be shared across subsystems such as the
Linux kernel, firmware components running on Cortex-M7 cores, or other
co-processors. The counter can be read atomically and provides a
stable timestamp source to correlate events occurring in different
execution contexts.

The Linux kernel controls the STM through a memory-mapped interface,
configuring the prescaler, enabling or disabling the counter, and
accounting for wrap-arounds. Other subsystems access the counter in
read-only mode, making it a shared timestamp reference across the
platform.

This driver adds support for the STM when used as a counter on S32G2
platforms. The device is described in the device tree using the
following compatible:

compatible = "nxp,s32g2-stm-cnt";

The driver exposes basic counter functionality: start, stop, reset,
prescaler configuration, and overflow handling.

Daniel Lezcano (3):
  counters: Reorder the Makefile
  dt-bindings: counter: Add NXP System Timer Module Counter
  counter: Add STM based counter

 .../bindings/counter/nxp,s32g2-stm-cnt.yaml   |  64 +++
 drivers/counter/Kconfig                       |  10 +
 drivers/counter/Makefile                      |  21 +-
 drivers/counter/nxp-stm-cnt.c                 | 387 ++++++++++++++++++
 4 files changed, 473 insertions(+), 9 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml
 create mode 100644 drivers/counter/nxp-stm-cnt.c

-- 
2.43.0

[PATCH v1 1/3] counters: Reorder the Makefile

[Daniel Lezcano]

The next changes provide a new driver. For the sake of clarity,
reorder the Makefile alphabetically.

No functional changes intended.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/counter/Makefile | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile
index fa3c1d08f706..40e644948e7a 100644
--- a/drivers/counter/Makefile
+++ b/drivers/counter/Makefile
@@ -6,14 +6,16 @@
 obj-$(CONFIG_COUNTER) += counter.o
 counter-y := counter-core.o counter-sysfs.o counter-chrdev.o
 
-obj-$(CONFIG_I8254)		+= i8254.o
-obj-$(CONFIG_104_QUAD_8)	+= 104-quad-8.o
+obj-$(CONFIG_104_QUAD_8)		+= 104-quad-8.o
+obj-$(CONFIG_FTM_QUADDEC)		+= ftm-quaddec.o
+obj-$(CONFIG_I8254)			+= i8254.o
+obj-$(CONFIG_INTEL_QEP)			+= intel-qep.o
 obj-$(CONFIG_INTERRUPT_CNT)		+= interrupt-cnt.o
-obj-$(CONFIG_RZ_MTU3_CNT)	+= rz-mtu3-cnt.o
-obj-$(CONFIG_STM32_TIMER_CNT)	+= stm32-timer-cnt.o
-obj-$(CONFIG_STM32_LPTIMER_CNT)	+= stm32-lptimer-cnt.o
-obj-$(CONFIG_TI_EQEP)		+= ti-eqep.o
-obj-$(CONFIG_FTM_QUADDEC)	+= ftm-quaddec.o
 obj-$(CONFIG_MICROCHIP_TCB_CAPTURE)	+= microchip-tcb-capture.o
-obj-$(CONFIG_INTEL_QEP)		+= intel-qep.o
-obj-$(CONFIG_TI_ECAP_CAPTURE)	+= ti-ecap-capture.o
+obj-$(CONFIG_RZ_MTU3_CNT)		+= rz-mtu3-cnt.o
+obj-$(CONFIG_STM32_TIMER_CNT)		+= stm32-timer-cnt.o
+obj-$(CONFIG_STM32_LPTIMER_CNT)		+= stm32-lptimer-cnt.o
+obj-$(CONFIG_TI_ECAP_CAPTURE)		+= ti-ecap-capture.o
+obj-$(CONFIG_TI_EQEP)			+= ti-eqep.o
+
+
-- 
2.43.0

[PATCH v1 2/3] dt-bindings: counter: Add NXP System Timer Module Counter

[Daniel Lezcano]

Add the System Timer Module description found on the NXP s32 platform
when it is used as a counter and the compatible for the s32g2 variant.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 .../bindings/counter/nxp,s32g2-stm-cnt.yaml   | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml

diff --git a/Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml b/Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml
new file mode 100644
index 000000000000..4d42996f5ad3
--- /dev/null
+++ b/Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/counter/nxp,s32g2-stm-cnt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP System Timer Module (STM)
+
+maintainers:
+  - Daniel Lezcano <daniel.lezcano@kernel.org>
+
+description:
+  The System Timer Module supports commonly required system and application
+  software timing functions. STM includes a 32-bit count-up timer and four
+  32-bit compare channels with a separate interrupt source for each channel.
+  The counter is driven by the STM module clock divided by an 8-bit prescale
+  value.
+
+properties:
+  compatible:
+    oneOf:
+      - const: nxp,s32g2-stm-cnt
+      - items:
+          - const: nxp,s32g3-stm-cnt
+          - const: nxp,s32g2-stm-cnt
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Counter clock
+      - description: Module clock
+      - description: Register clock
+
+  clock-names:
+    items:
+      - const: counter
+      - const: module
+      - const: register
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    timer@4011c000 {
+        compatible = "nxp,s32g2-stm-cnt";
+        reg = <0x4011c000 0x3000>;
+        interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clks 0x3b>, <&clks 0x3c>, <&clks 0x3c>;
+        clock-names = "counter", "module", "register";
+    };
-- 
2.43.0

Re: [PATCH v1 2/3] dt-bindings: counter: Add NXP System Timer Module Counter

[Rob Herring (Arm)]

On Mon, 08 Dec 2025 04:04:12 +0100, Daniel Lezcano wrote:
> Add the System Timer Module description found on the NXP s32 platform
> when it is used as a counter and the compatible for the s32g2 variant.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
>  .../bindings/counter/nxp,s32g2-stm-cnt.yaml   | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/counter/nxp,s32g2-stm-cnt.yaml
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>

[PATCH v1 3/3] counter: Add STM based counter

[Daniel Lezcano]

The NXP S32G2 automotive platform integrates four Cortex-A53 cores and
three Cortex-M7 cores, along with a large number of timers and
counters. These hardware blocks can be used as clocksources or
clockevents, or as timestamp counters shared across the various
subsystems running alongside the Linux kernel, such as firmware
components. Their actual usage depends on the overall platform
software design.

In a Linux-based system, the kernel controls the counter, which is a
read-only shared resource for the other subsystems. One of its primary
purposes is to act as a common timestamp source for messages or
traces, allowing correlation of events occurring in different
operating system contexts.

These changes introduce a basic counter driver that can start, stop,
and reset the counter. It also handles overflow accounting and
configures the prescaler value.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/counter/Kconfig       |  10 +
 drivers/counter/Makefile      |   1 +
 drivers/counter/nxp-stm-cnt.c | 387 ++++++++++++++++++++++++++++++++++
 3 files changed, 398 insertions(+)
 create mode 100644 drivers/counter/nxp-stm-cnt.c

diff --git a/drivers/counter/Kconfig b/drivers/counter/Kconfig
index d30d22dfe577..bf5b281f194c 100644
--- a/drivers/counter/Kconfig
+++ b/drivers/counter/Kconfig
@@ -90,6 +90,16 @@ config MICROCHIP_TCB_CAPTURE
 	  To compile this driver as a module, choose M here: the
 	  module will be called microchip-tcb-capture.
 
+config NXP_STM_CNT
+	tristate "NXP System Timer Module Counter driver"
+	depends on ARCH_S32 || COMPILE_TEST
+	help
+	  Select this option to enable the NXP System Timer Module
+	  Counter driver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called nxp_stm_cnt.
+
 config RZ_MTU3_CNT
 	tristate "Renesas RZ/G2L MTU3a counter driver"
 	depends on RZ_MTU3
diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile
index 40e644948e7a..196b3c216875 100644
--- a/drivers/counter/Makefile
+++ b/drivers/counter/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_I8254)			+= i8254.o
 obj-$(CONFIG_INTEL_QEP)			+= intel-qep.o
 obj-$(CONFIG_INTERRUPT_CNT)		+= interrupt-cnt.o
 obj-$(CONFIG_MICROCHIP_TCB_CAPTURE)	+= microchip-tcb-capture.o
+obj-$(CONFIG_NXP_STM_CNT)		+= nxp-stm-cnt.o
 obj-$(CONFIG_RZ_MTU3_CNT)		+= rz-mtu3-cnt.o
 obj-$(CONFIG_STM32_TIMER_CNT)		+= stm32-timer-cnt.o
 obj-$(CONFIG_STM32_LPTIMER_CNT)		+= stm32-lptimer-cnt.o
diff --git a/drivers/counter/nxp-stm-cnt.c b/drivers/counter/nxp-stm-cnt.c
new file mode 100644
index 000000000000..ff6db07962f4
--- /dev/null
+++ b/drivers/counter/nxp-stm-cnt.c
@@ -0,0 +1,387 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2018,2021-2025 NXP
+ * Copyright 2025 Linaro Limited
+ *
+ * Author: Daniel Lezcano <daniel.lezcano@linaro.org>
+ *
+ * NXP S32G System Timer Module counters:
+ *
+ *  STM supports commonly required system and application software
+ *  timing functions. STM includes a 32-bit count-up timer and four
+ *  32-bit compare channels with a separate interrupt source for each
+ *  channel. The timer is driven by the STM module clock divided by an
+ *  8-bit prescale value (1 to 256). It has ability to stop the timer
+ *  in Debug mode
+ *
+ */
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/counter.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#define STM_CR(__base)		(__base)
+#define STM_CR_TEN		BIT(0)
+#define STM_CR_FRZ		BIT(1)
+#define STM_CR_CPS_MASK         GENMASK(15, 8)
+
+#define STM_CCR0(__base)	((__base) + 0x10)
+#define STM_CCR_CEN		BIT(0)
+
+#define STM_CIR0(__base)	((__base) + 0x14)
+#define STM_CIR_CIF		BIT(0)
+
+#define STM_CMP0(__base)	((__base) + 0x18)
+
+#define STM_CNT(__base)		((__base) + 0x04)
+
+#define STM_ENABLE_MASK	(STM_CR_FRZ | STM_CR_TEN)
+
+struct nxp_stm_cnt {
+	spinlock_t lock;
+	void __iomem *base;
+	u64 overflow;
+	u32 counter;
+	u8 prescaler;
+	bool is_started;
+};
+
+static void nxp_stm_cnt_enable(struct nxp_stm_cnt *stm_cnt)
+{
+	u32 reg;
+
+	reg = readl(STM_CR(stm_cnt->base));
+
+	reg |= STM_ENABLE_MASK;
+
+	writel(reg, STM_CR(stm_cnt->base));
+}
+
+static void nxp_stm_cnt_disable(struct nxp_stm_cnt *stm_cnt)
+{
+	u32 reg;
+
+	reg = readl(STM_CR(stm_cnt->base));
+
+	reg &= ~STM_ENABLE_MASK;
+
+	writel(reg, STM_CR(stm_cnt->base));
+}
+
+static void nxp_stm_cnt_ccr_disable(struct nxp_stm_cnt *stm_cnt)
+{
+	writel(0, STM_CCR0(stm_cnt->base));
+}
+
+static void nxp_stm_cnt_ccr_enable(struct nxp_stm_cnt *stm_cnt)
+{
+	writel(STM_CCR_CEN, STM_CCR0(stm_cnt->base));
+}
+
+static void nxp_stm_cnt_set_overflow(struct nxp_stm_cnt *stm_cnt)
+{
+	writel(UINT_MAX, STM_CMP0(stm_cnt->base));
+}
+
+static u32 nxp_stm_cnt_get_counter(struct nxp_stm_cnt *stm_cnt)
+{
+	return readl(STM_CNT(stm_cnt->base));
+}
+
+static void nxp_stm_cnt_set_counter(struct nxp_stm_cnt *stm_cnt, u32 counter)
+{
+	writel(counter, STM_CNT(stm_cnt->base));
+}
+
+static void nxp_stm_cnt_set_prescaler(struct nxp_stm_cnt *stm_cnt, u8 prescaler)
+{
+	u32 reg;
+
+	reg = readl(STM_CR(stm_cnt->base));
+
+	FIELD_MODIFY(STM_CR_CPS_MASK, &reg, prescaler);
+
+	writel(reg, STM_CR(stm_cnt->base));
+}
+
+static u8 nxp_stm_cnt_get_prescaler(struct nxp_stm_cnt *stm_cnt)
+{
+	u32 reg = readl(STM_CR(stm_cnt->base));
+
+	return FIELD_GET(STM_CR_CPS_MASK, reg);
+}
+
+static bool nxp_stm_cnt_is_started(struct nxp_stm_cnt *stm_cnt)
+{
+	u32 reg;
+
+	reg = readl(STM_CR(stm_cnt->base));
+
+	return !!FIELD_GET(STM_CR_TEN, reg);
+}
+
+static void nxp_stm_cnt_irq_ack(struct nxp_stm_cnt *stm_cnt)
+{
+	writel(STM_CIR_CIF, STM_CIR0(stm_cnt->base));
+}
+
+static irqreturn_t nxp_stm_cnt_irq(int irq, void *dev_id)
+{
+	struct nxp_stm_cnt *stm_cnt = dev_id;
+
+	nxp_stm_cnt_irq_ack(stm_cnt);
+
+	spin_lock(&stm_cnt->lock);
+	stm_cnt->overflow++;
+	spin_unlock(&stm_cnt->lock);
+
+	return IRQ_HANDLED;
+}
+
+static void nxp_stm_cnt_start(struct nxp_stm_cnt *stm_cnt)
+{
+	nxp_stm_cnt_ccr_enable(stm_cnt);
+	nxp_stm_cnt_set_overflow(stm_cnt);
+	nxp_stm_cnt_enable(stm_cnt);
+}
+
+static void nxp_stm_cnt_stop(struct nxp_stm_cnt *stm_cnt)
+{
+	nxp_stm_cnt_disable(stm_cnt);
+	nxp_stm_cnt_irq_ack(stm_cnt);
+	nxp_stm_cnt_ccr_disable(stm_cnt);
+}
+
+static int nxp_stm_cnt_overflow_read(struct counter_device *counter,
+				     struct counter_count *count, u64 *val)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(counter);
+	unsigned long irqflags;
+
+	spin_lock_irqsave(&stm_cnt->lock, irqflags);
+	*val = stm_cnt->overflow;
+	spin_unlock_irqrestore(&stm_cnt->lock, irqflags);
+
+	return 0;
+}
+
+static int nxp_stm_cnt_overflow_write(struct counter_device *counter,
+				      struct counter_count *count, u64 val)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(counter);
+	unsigned long irqflags;
+
+	spin_lock_irqsave(&stm_cnt->lock, irqflags);
+	stm_cnt->overflow = val;
+	spin_unlock_irqrestore(&stm_cnt->lock, irqflags);
+
+	return 0;
+}
+
+static int nxp_stm_cnt_reset_write(struct counter_device *counter,
+				   struct counter_count *count, u8 val)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(counter);
+
+	nxp_stm_cnt_set_counter(stm_cnt, 0);
+	spin_lock(&stm_cnt->lock);
+	stm_cnt->overflow = 0;
+	spin_unlock(&stm_cnt->lock);
+
+	return 0;
+}
+
+static int nxp_stm_cnt_prescaler_read(struct counter_device *counter,
+				      struct counter_count *count, u8 *val)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(counter);
+
+	*val = nxp_stm_cnt_get_prescaler(stm_cnt);
+
+	return 0;
+}
+
+static int nxp_stm_cnt_prescaler_write(struct counter_device *counter,
+				       struct counter_count *count, u8 val)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(counter);
+
+	nxp_stm_cnt_set_prescaler(stm_cnt, val);
+
+	return 0;
+}
+
+static int nxp_stm_cnt_count_enable_write(struct counter_device *counter,
+					  struct counter_count *count, u8 enable)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(counter);
+
+	if (enable)
+		nxp_stm_cnt_start(stm_cnt);
+	else
+		nxp_stm_cnt_stop(stm_cnt);
+
+	return 0;
+}
+
+static int nxp_stm_cnt_count_enable_read(struct counter_device *counter,
+					 struct counter_count *count, u8 *enable)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(counter);
+
+	*enable = nxp_stm_cnt_is_started(stm_cnt);
+
+	return 0;
+}
+
+static struct counter_comp stm_cnt_count_ext[] = {
+	COUNTER_COMP_COUNT_BOOL("reset",  NULL, nxp_stm_cnt_reset_write),
+	COUNTER_COMP_COUNT_U8("prescaler", nxp_stm_cnt_prescaler_read, nxp_stm_cnt_prescaler_write),
+	COUNTER_COMP_COUNT_U64("overflows", nxp_stm_cnt_overflow_read, nxp_stm_cnt_overflow_write),
+	COUNTER_COMP_ENABLE(nxp_stm_cnt_count_enable_read, nxp_stm_cnt_count_enable_write),
+};
+
+static int nxp_stm_cnt_count_read(struct counter_device *dev,
+				  struct counter_count *count, u64 *val)
+{
+	struct nxp_stm_cnt *stm_cnt = counter_priv(dev);
+
+	*val = nxp_stm_cnt_get_counter(stm_cnt);
+
+	return 0;
+}
+
+static const struct counter_ops nxp_stm_cnt_counter_ops = {
+	.count_read  = nxp_stm_cnt_count_read,
+};
+
+static struct counter_count nxp_stm_cnt_counts[] = {
+	{
+		.id = 0,
+		.name = "stm_cnt",
+		.ext = stm_cnt_count_ext,
+		.num_ext = ARRAY_SIZE(stm_cnt_count_ext),
+	},
+};
+
+static int nxp_stm_cnt_suspend(struct device *dev)
+{
+	struct nxp_stm_cnt *stm_cnt = dev_get_drvdata(dev);
+
+	stm_cnt->is_started = nxp_stm_cnt_is_started(stm_cnt);
+
+	if (stm_cnt->is_started) {
+		nxp_stm_cnt_stop(stm_cnt);
+		stm_cnt->prescaler = nxp_stm_cnt_get_prescaler(stm_cnt);
+		stm_cnt->counter = nxp_stm_cnt_get_counter(stm_cnt);
+	}
+
+	return 0;
+}
+
+static int nxp_stm_cnt_resume(struct device *dev)
+{
+	struct nxp_stm_cnt *stm_cnt = dev_get_drvdata(dev);
+
+	if (stm_cnt->is_started) {
+		nxp_stm_cnt_set_counter(stm_cnt, stm_cnt->counter);
+		nxp_stm_cnt_set_prescaler(stm_cnt, stm_cnt->prescaler);
+		nxp_stm_cnt_start(stm_cnt);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops nxp_stm_cnt_pm_ops = {
+	.suspend = nxp_stm_cnt_suspend,
+	.resume  = nxp_stm_cnt_resume,
+};
+
+static int nxp_stm_cnt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct counter_device *counter;
+	struct nxp_stm_cnt *stm_cnt;
+	struct clk *clk;
+	void __iomem *base;
+	int irq, ret;
+
+	base = devm_of_iomap(dev, np, 0, NULL);
+	if (IS_ERR(base))
+		return dev_err_probe(dev, PTR_ERR(base), "Failed to iomap %pOFn\n", np);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return dev_err_probe(dev, irq, "Failed to get IRQ\n");
+
+	clk = devm_clk_get_enabled(dev, NULL);
+	if (IS_ERR(clk))
+		return dev_err_probe(dev, PTR_ERR(clk), "Clock not found\n");
+
+	counter = devm_counter_alloc(dev, sizeof(*stm_cnt));
+	if (!counter)
+		return -ENOMEM;
+
+	stm_cnt = counter_priv(counter);
+
+	stm_cnt->base = base;
+	stm_cnt->overflow = 0;
+	spin_lock_init(&stm_cnt->lock);
+
+	counter->name       = "stm_counter";
+	counter->parent     = &pdev->dev;
+	counter->ops        = &nxp_stm_cnt_counter_ops;
+	counter->counts     = nxp_stm_cnt_counts;
+	counter->num_counts = ARRAY_SIZE(nxp_stm_cnt_counts);
+
+	ret = devm_request_irq(dev, irq, nxp_stm_cnt_irq, IRQF_TIMER | IRQF_NOBALANCING,
+			       dev_name(&counter->dev), stm_cnt);
+	if (ret)
+		return dev_err_probe(dev, ret, "Unable to allocate interrupt line\n");
+
+	ret = devm_counter_add(dev, counter);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to register counter\n");
+
+	platform_set_drvdata(pdev, stm_cnt);
+
+	return 0;
+}
+
+static void nxp_stm_cnt_remove(struct platform_device *pdev)
+{
+	struct nxp_stm_cnt *stm_cnt = platform_get_drvdata(pdev);
+
+	if (nxp_stm_cnt_is_started(stm_cnt))
+		nxp_stm_cnt_stop(stm_cnt);
+}
+
+static const struct of_device_id nxp_stm_cnt_of_match[] = {
+	{ .compatible = "nxp,s32g2-stm", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, nxp_stm_cnt_of_match);
+
+static struct platform_driver nxp_stm_cnt_driver = {
+	.probe  = nxp_stm_cnt_probe,
+	.remove = nxp_stm_cnt_remove,
+	.driver = {
+		.name           = "nxp-stm-cnt",
+		.of_match_table = nxp_stm_cnt_of_match,
+	},
+};
+module_platform_driver(nxp_stm_cnt_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Daniel Lezcano");
+MODULE_DESCRIPTION("NXP System Timer Module counter driver");
+MODULE_IMPORT_NS("COUNTER");
-- 
2.43.0

Re: [PATCH v1 3/3] counter: Add STM based counter

[kernel test robot]

Hi Daniel,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on linus/master v6.18 next-20251208]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Lezcano/counters-Reorder-the-Makefile/20251208-110937
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20251208030413.3117660-4-daniel.lezcano%40linaro.org
patch subject: [PATCH v1 3/3] counter: Add STM based counter
config: loongarch-randconfig-001-20251209 (https://download.01.org/0day-ci/archive/20251209/202512090408.Ju8SNkSq-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 6ec8c4351cfc1d0627d1633b02ea787bd29c77d8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251209/202512090408.Ju8SNkSq-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512090408.Ju8SNkSq-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/counter/nxp-stm-cnt.c:110:2: error: call to undeclared function 'FIELD_MODIFY'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     110 |         FIELD_MODIFY(STM_CR_CPS_MASK, &reg, prescaler);
         |         ^
>> drivers/counter/nxp-stm-cnt.c:119:9: error: call to undeclared function 'FIELD_GET'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     119 |         return FIELD_GET(STM_CR_CPS_MASK, reg);
         |                ^
   drivers/counter/nxp-stm-cnt.c:128:11: error: call to undeclared function 'FIELD_GET'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     128 |         return !!FIELD_GET(STM_CR_TEN, reg);
         |                  ^
   3 errors generated.


vim +/FIELD_MODIFY +110 drivers/counter/nxp-stm-cnt.c

   103	
   104	static void nxp_stm_cnt_set_prescaler(struct nxp_stm_cnt *stm_cnt, u8 prescaler)
   105	{
   106		u32 reg;
   107	
   108		reg = readl(STM_CR(stm_cnt->base));
   109	
 > 110		FIELD_MODIFY(STM_CR_CPS_MASK, &reg, prescaler);
   111	
   112		writel(reg, STM_CR(stm_cnt->base));
   113	}
   114	
   115	static u8 nxp_stm_cnt_get_prescaler(struct nxp_stm_cnt *stm_cnt)
   116	{
   117		u32 reg = readl(STM_CR(stm_cnt->base));
   118	
 > 119		return FIELD_GET(STM_CR_CPS_MASK, reg);
   120	}
   121	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v1 3/3] counter: Add STM based counter

[kernel test robot]

Hi Daniel,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.18 next-20251208]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Lezcano/counters-Reorder-the-Makefile/20251208-110937
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20251208030413.3117660-4-daniel.lezcano%40linaro.org
patch subject: [PATCH v1 3/3] counter: Add STM based counter
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20251209/202512090533.JQEqVYW8-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251209/202512090533.JQEqVYW8-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512090533.JQEqVYW8-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/counter/nxp-stm-cnt.c: In function 'nxp_stm_cnt_set_prescaler':
   drivers/counter/nxp-stm-cnt.c:110:9: error: implicit declaration of function 'FIELD_MODIFY' [-Wimplicit-function-declaration]
     110 |         FIELD_MODIFY(STM_CR_CPS_MASK, &reg, prescaler);
         |         ^~~~~~~~~~~~
   drivers/counter/nxp-stm-cnt.c: In function 'nxp_stm_cnt_get_prescaler':
   drivers/counter/nxp-stm-cnt.c:119:16: error: implicit declaration of function 'FIELD_GET' [-Wimplicit-function-declaration]
     119 |         return FIELD_GET(STM_CR_CPS_MASK, reg);
         |                ^~~~~~~~~
   drivers/counter/nxp-stm-cnt.c: At top level:
>> drivers/counter/nxp-stm-cnt.c:303:32: warning: 'nxp_stm_cnt_pm_ops' defined but not used [-Wunused-const-variable=]
     303 | static const struct dev_pm_ops nxp_stm_cnt_pm_ops = {
         |                                ^~~~~~~~~~~~~~~~~~


vim +/nxp_stm_cnt_pm_ops +303 drivers/counter/nxp-stm-cnt.c

   302	
 > 303	static const struct dev_pm_ops nxp_stm_cnt_pm_ops = {
   304		.suspend = nxp_stm_cnt_suspend,
   305		.resume  = nxp_stm_cnt_resume,
   306	};
   307	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v1 3/3] counter: Add STM based counter

[kernel test robot]

Hi Daniel,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.18 next-20251208]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Lezcano/counters-Reorder-the-Makefile/20251208-110937
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20251208030413.3117660-4-daniel.lezcano%40linaro.org
patch subject: [PATCH v1 3/3] counter: Add STM based counter
config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20251209/202512090758.GOPbQ2xm-lkp@intel.com/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251209/202512090758.GOPbQ2xm-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512090758.GOPbQ2xm-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/counter/nxp-stm-cnt.c:303:32: warning: unused variable 'nxp_stm_cnt_pm_ops' [-Wunused-const-variable]
   static const struct dev_pm_ops nxp_stm_cnt_pm_ops = {
                                  ^
   1 warning generated.


vim +/nxp_stm_cnt_pm_ops +303 drivers/counter/nxp-stm-cnt.c

   302	
 > 303	static const struct dev_pm_ops nxp_stm_cnt_pm_ops = {
   304		.suspend = nxp_stm_cnt_suspend,
   305		.resume  = nxp_stm_cnt_resume,
   306	};
   307	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki