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, ®, 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");
--
2.43.0Hi 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
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, ®, 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
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, ®, 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, ®, 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
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