[PATCH v2 4/7] thermal: samsung: Add support for GS101 TMU

Tudor Ambarus
2026-01-19T12:08:58Z

Add the thermal driver for the Google GS101 SoC.

The GS101 TMU utilizes a hybrid management model shared between the
Application Processor (AP) and the ACPM (Alive Clock and Power Manager)
firmware. The driver maintains direct memory-mapped access to the TMU
interrupt pending registers to identify thermal events, while delegating
functional tasks - such as sensor initialization, threshold configuration,
and temperature acquisition - to the ACPM firmware via the ACPM IPC
protocol.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
---
drivers/thermal/samsung/Kconfig | 16 +
drivers/thermal/samsung/Makefile | 2 +
drivers/thermal/samsung/acpm-tmu.c | 643 +++++++++++++++++++++++++++++++++++++
3 files changed, 661 insertions(+)

diff --git a/drivers/thermal/samsung/Kconfig b/drivers/thermal/samsung/Kconfig
index f4eff5a41a84ce02b12abb85d6a0f8818031d0dc..5679dfa85f4079c7d40317ac231bd6a1af93c7e7 100644
--- a/drivers/thermal/samsung/Kconfig
+++ b/drivers/thermal/samsung/Kconfig
@@ -9,3 +9,19 @@ config EXYNOS_THERMAL
the TMU, reports temperature and handles cooling action if defined.
This driver uses the Exynos core thermal APIs and TMU configuration
data from the supported SoCs.
+
+config EXYNOS_ACPM_THERMAL
+ tristate "Exynos ACPM thermal management unit driver"
+ depends on THERMAL_OF
+ depends on EXYNOS_ACPM_PROTOCOL || (COMPILE_TEST && !EXYNOS_ACPM_PROTOCOL)
+ help
+ Support for the Thermal Management Unit (TMU) on Google GS101 SoC.
+
+ The TMU on GS101 is managed through a hybrid architecture. This driver
+ handles direct register access for thermal interrupt status monitoring
+ and communicates with the Alive Clock and Power Manager (ACPM)
+ firmware via the ACPM IPC protocol for functional sensor control and
+ configuration.
+
+ Select this if you want to monitor device temperature and enable
+ thermal mitigation on GS101 based devices.
diff --git a/drivers/thermal/samsung/Makefile b/drivers/thermal/samsung/Makefile
index f139407150d26940fc9ffcf000505cea4866223f..daed80647c349ba4f937ed8fbe6be9df06c34aac 100644
--- a/drivers/thermal/samsung/Makefile
+++ b/drivers/thermal/samsung/Makefile
@@ -4,3 +4,5 @@
#
obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
exynos_thermal-y := exynos_tmu.o
+obj-$(CONFIG_EXYNOS_ACPM_THERMAL) += exynos_acpm_thermal.o
+exynos_acpm_thermal-y := acpm-tmu.o
diff --git a/drivers/thermal/samsung/acpm-tmu.c b/drivers/thermal/samsung/acpm-tmu.c
new file mode 100644
index 0000000000000000000000000000000000000000..9fbac174e554284ff0b8c0b188a44dcceee4c440
--- /dev/null
+++ b/drivers/thermal/samsung/acpm-tmu.c
@@ -0,0 +1,643 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2019 Samsung Electronics Co., Ltd.
+ * Copyright 2025 Google LLC.
+ * Copyright 2026 Linaro Ltd.
+ */
+
+#include <linux/cleanup.h>
+#include <linux/clk.h>
+#include <linux/device/devres.h>
+#include <linux/err.h>
+#include <linux/firmware/samsung/exynos-acpm-protocol.h>
+#include <linux/interrupt.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/thermal.h>
+#include <linux/units.h>
+
+#include "../thermal_hwmon.h"
+
+#define EXYNOS_TMU_SENSOR(i) BIT(i)
+#define EXYNOS_TMU_SENSORS_MAX_COUNT 16
+
+#define GS101_CPUCL2_SENSOR_MASK (EXYNOS_TMU_SENSOR(0) | \
+ EXYNOS_TMU_SENSOR(6) | \
+ EXYNOS_TMU_SENSOR(7) | \
+ EXYNOS_TMU_SENSOR(8) | \
+ EXYNOS_TMU_SENSOR(9))
+#define GS101_CPUCL1_SENSOR_MASK (EXYNOS_TMU_SENSOR(4) | \
+ EXYNOS_TMU_SENSOR(5))
+#define GS101_CPUCL0_SENSOR_MASK (EXYNOS_TMU_SENSOR(1) | \
+ EXYNOS_TMU_SENSOR(2))
+
+#define GS101_REG_INTPEND(i) ((i) * 0x50 + 0xf8)
+
+enum {
+ P0_INTPEND,
+ P1_INTPEND,
+ P2_INTPEND,
+ P3_INTPEND,
+ P4_INTPEND,
+ P5_INTPEND,
+ P6_INTPEND,
+ P7_INTPEND,
+ P8_INTPEND,
+ P9_INTPEND,
+ P10_INTPEND,
+ P11_INTPEND,
+ P12_INTPEND,
+ P13_INTPEND,
+ P14_INTPEND,
+ P15_INTPEND,
+ REG_INTPEND_COUNT,
+};
+
+struct acpm_tmu_sensor_group {
+ u16 mask;
+ u8 id;
+};
+
+struct acpm_tmu_sensor {
+ const struct acpm_tmu_sensor_group *group;
+ struct thermal_zone_device *tzd;
+ struct acpm_tmu_priv *priv;
+ struct mutex lock; /* protects sensor state */
+ bool enabled;
+};
+
+struct acpm_tmu_priv {
+ struct regmap_field *regmap_fields[REG_INTPEND_COUNT];
+ const struct acpm_handle *handle;
+ struct device *dev;
+ struct clk *clk;
+ unsigned int mbox_chan_id;
+ unsigned int num_sensors;
+ int irq;
+ struct acpm_tmu_sensor sensors[] __counted_by(num_sensors);
+};
+
+struct acpm_tmu_driver_data {
+ const struct reg_field *reg_fields;
+ const struct acpm_tmu_sensor_group *sensor_groups;
+ unsigned int num_sensor_groups;
+ unsigned int mbox_chan_id;
+};
+
+struct acpm_tmu_initialize_tripwalkdata {
+ unsigned char threshold[8];
+ unsigned char hysteresis[8];
+ unsigned char inten;
+ int i;
+};
+
+struct acpm_tmu_trip_temp_tripwalkdata {
+ const struct thermal_trip *trip;
+ unsigned char threshold[8];
+ int temperature;
+ int i;
+};
+
+#define ACPM_TMU_SENSOR_GROUP(_mask, _id) \
+ { \
+ .mask = _mask, \
+ .id = _id, \
+ }
+
+static const struct acpm_tmu_sensor_group gs101_sensor_groups[] = {
+ ACPM_TMU_SENSOR_GROUP(GS101_CPUCL2_SENSOR_MASK, 0),
+ ACPM_TMU_SENSOR_GROUP(GS101_CPUCL1_SENSOR_MASK, 1),
+ ACPM_TMU_SENSOR_GROUP(GS101_CPUCL0_SENSOR_MASK, 2),
+};
+
+static const struct reg_field gs101_reg_fields[REG_INTPEND_COUNT] = {
+ [P0_INTPEND] = REG_FIELD(GS101_REG_INTPEND(0), 0, 31),
+ [P1_INTPEND] = REG_FIELD(GS101_REG_INTPEND(1), 0, 31),
+ [P2_INTPEND] = REG_FIELD(GS101_REG_INTPEND(2), 0, 31),
+ [P3_INTPEND] = REG_FIELD(GS101_REG_INTPEND(3), 0, 31),
+ [P4_INTPEND] = REG_FIELD(GS101_REG_INTPEND(4), 0, 31),
+ [P5_INTPEND] = REG_FIELD(GS101_REG_INTPEND(5), 0, 31),
+ [P6_INTPEND] = REG_FIELD(GS101_REG_INTPEND(6), 0, 31),
+ [P7_INTPEND] = REG_FIELD(GS101_REG_INTPEND(7), 0, 31),
+ [P8_INTPEND] = REG_FIELD(GS101_REG_INTPEND(8), 0, 31),
+ [P9_INTPEND] = REG_FIELD(GS101_REG_INTPEND(9), 0, 31),
+ [P10_INTPEND] = REG_FIELD(GS101_REG_INTPEND(10), 0, 31),
+ [P11_INTPEND] = REG_FIELD(GS101_REG_INTPEND(11), 0, 31),
+ [P12_INTPEND] = REG_FIELD(GS101_REG_INTPEND(12), 0, 31),
+ [P13_INTPEND] = REG_FIELD(GS101_REG_INTPEND(13), 0, 31),
+ [P14_INTPEND] = REG_FIELD(GS101_REG_INTPEND(14), 0, 31),
+ [P15_INTPEND] = REG_FIELD(GS101_REG_INTPEND(15), 0, 31),
+};
+
+static const struct regmap_config gs101_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .use_relaxed_mmio = true,
+ .max_register = GS101_REG_INTPEND(15),
+};
+
+static const struct acpm_tmu_driver_data acpm_tmu_gs101 = {
+ .reg_fields = gs101_reg_fields,
+ .sensor_groups = gs101_sensor_groups,
+ .num_sensor_groups = ARRAY_SIZE(gs101_sensor_groups),
+ .mbox_chan_id = 9,
+};
+
+static int acpm_tmu_op_tz_control(struct acpm_tmu_sensor *sensor, bool on)
+{
+ struct acpm_tmu_priv *priv = sensor->priv;
+ const struct acpm_handle *handle = priv->handle;
+ const struct acpm_tmu_ops *ops = &handle->ops.tmu;
+ int ret;
+
+ ret = ops->tz_control(handle, priv->mbox_chan_id, sensor->group->id,
+ on);
+ if (ret)
+ return ret;
+
+ sensor->enabled = on;
+
+ return 0;
+}
+
+static int acpm_tmu_control(struct acpm_tmu_priv *priv, bool on)
+{
+ struct device *dev = priv->dev;
+ int i, ret;
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < priv->num_sensors; i++) {
+ struct acpm_tmu_sensor *sensor = &priv->sensors[i];
+
+ /* Skip sensors that weren't found in DT */
+ if (!sensor->tzd)
+ continue;
+
+ scoped_guard(mutex, &sensor->lock) {
+ ret = acpm_tmu_op_tz_control(sensor, on);
+ }
+
+ if (ret)
+ goto out;
+ }
+
+out:
+ pm_runtime_put_autosuspend(dev);
+ return ret;
+}
+
+static int acpm_tmu_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+ struct acpm_tmu_sensor *sensor = thermal_zone_device_priv(tz);
+ struct acpm_tmu_priv *priv = sensor->priv;
+ const struct acpm_handle *handle = priv->handle;
+ const struct acpm_tmu_ops *ops = &handle->ops.tmu;
+ struct device *dev = priv->dev;
+ int acpm_temp, ret;
+
+ if (!sensor->enabled)
+ return -EAGAIN;
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret < 0)
+ return ret;
+
+ scoped_guard(mutex, &sensor->lock) {
+ ret = ops->read_temp(handle, priv->mbox_chan_id,
+ sensor->group->id, &acpm_temp);
+ }
+
+ pm_runtime_put_autosuspend(dev);
+
+ if (ret)
+ return ret;
+
+ *temp = acpm_temp * MILLIDEGREE_PER_DEGREE;
+
+ return 0;
+}
+
+static int acpm_tmu_trip_temp_walk_cb(struct thermal_trip *trip, void *data)
+{
+ struct acpm_tmu_trip_temp_tripwalkdata * const twd = data;
+ int temperature;
+
+ if (twd->i >= ARRAY_SIZE(twd->threshold))
+ return -ERANGE;
+
+ if (trip->type == THERMAL_TRIP_PASSIVE)
+ goto out;
+
+ temperature = (trip == twd->trip) ? twd->temperature : trip->temperature;
+
+ twd->threshold[twd->i] = temperature / MILLIDEGREE_PER_DEGREE;
+
+out:
+ ++twd->i;
+ return 0;
+}
+
+static int acpm_tmu_set_trip_temp(struct thermal_zone_device *tz,
+ const struct thermal_trip *trip, int temperature)
+{
+ struct acpm_tmu_sensor *sensor = thermal_zone_device_priv(tz);
+ struct acpm_tmu_priv *priv = sensor->priv;
+ const struct acpm_handle *handle = priv->handle;
+ const struct acpm_tmu_ops *ops = &handle->ops.tmu;
+ struct device *dev = priv->dev;
+ struct acpm_tmu_trip_temp_tripwalkdata twd = {
+ .trip = trip,
+ .temperature = temperature,
+ };
+ int ret;
+
+ if (trip->type == THERMAL_TRIP_PASSIVE)
+ return 0;
+
+ for_each_thermal_trip(tz, acpm_tmu_trip_temp_walk_cb, &twd);
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret)
+ return ret;
+
+ guard(mutex)(&sensor->lock);
+
+ if (!sensor->enabled) {
+ ret = ops->set_threshold(handle, priv->mbox_chan_id,
+ sensor->group->id, twd.threshold,
+ ARRAY_SIZE(twd.threshold));
+ goto out;
+ }
+
+ ret = acpm_tmu_op_tz_control(sensor, false);
+ if (ret)
+ goto out;
+
+ ret = ops->set_threshold(handle, priv->mbox_chan_id, sensor->group->id,
+ twd.threshold, ARRAY_SIZE(twd.threshold));
+ if (ret)
+ goto out;
+
+ ret = acpm_tmu_op_tz_control(sensor, true);
+
+out:
+ pm_runtime_put_autosuspend(dev);
+ return ret;
+}
+
+static const struct thermal_zone_device_ops acpm_tmu_sensor_ops = {
+ .get_temp = acpm_tmu_get_temp,
+ .set_trip_temp = acpm_tmu_set_trip_temp,
+};
+
+static int acpm_tmu_has_pending_irq(struct acpm_tmu_sensor *sensor,
+ bool *pending_irq)
+{
+ struct acpm_tmu_priv *priv = sensor->priv;
+ unsigned long mask = sensor->group->mask;
+ int i, ret;
+ u32 val;
+
+ guard(mutex)(&sensor->lock);
+
+ for_each_set_bit(i, &mask, EXYNOS_TMU_SENSORS_MAX_COUNT) {
+ ret = regmap_field_read(priv->regmap_fields[i], &val);
+ if (ret)
+ return ret;
+
+ if (val) {
+ *pending_irq = true;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static irqreturn_t acpm_tmu_thread_fn(int irq, void *id)
+{
+ struct acpm_tmu_priv *priv = id;
+ const struct acpm_handle *handle = priv->handle;
+ const struct acpm_tmu_ops *ops = &handle->ops.tmu;
+ struct device *dev = priv->dev;
+ int i, ret;
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret) {
+ dev_err(dev, "Failed to resume: %d\n", ret);
+ return IRQ_NONE;
+ }
+
+ for (i = 0; i < priv->num_sensors; i++) {
+ struct acpm_tmu_sensor *sensor = &priv->sensors[i];
+ bool pending_irq = false;
+
+ if (!sensor->tzd)
+ continue;
+
+ ret = acpm_tmu_has_pending_irq(sensor, &pending_irq);
+ if (ret || !pending_irq)
+ continue;
+
+ thermal_zone_device_update(sensor->tzd,
+ THERMAL_EVENT_UNSPECIFIED);
+
+ scoped_guard(mutex, &sensor->lock) {
+ ret = ops->clear_tz_irq(handle, priv->mbox_chan_id,
+ sensor->group->id);
+ if (ret)
+ dev_err(priv->dev, "Sensor %d: failed to clear IRQ (%d)\n",
+ i, ret);
+ }
+ }
+
+ pm_runtime_put_autosuspend(dev);
+
+ return IRQ_HANDLED;
+}
+
+static int acpm_tmu_init_sensor(struct acpm_tmu_sensor *sensor,
+ const struct acpm_tmu_initialize_tripwalkdata *twd)
+{
+ struct acpm_tmu_priv *priv = sensor->priv;
+ const struct acpm_handle *handle = priv->handle;
+ const struct acpm_tmu_ops *ops = &handle->ops.tmu;
+ unsigned int mbox_chan_id = priv->mbox_chan_id;
+ u8 acpm_sensor_id = sensor->group->id;
+ int ret;
+
+ guard(mutex)(&sensor->lock);
+
+ ret = ops->set_threshold(handle, mbox_chan_id, acpm_sensor_id,
+ twd->threshold,
+ ARRAY_SIZE(twd->threshold));
+ if (ret)
+ return ret;
+
+ ret = ops->set_hysteresis(handle, mbox_chan_id, acpm_sensor_id,
+ twd->hysteresis,
+ ARRAY_SIZE(twd->threshold));
+ if (ret)
+ return ret;
+
+ ret = ops->set_interrupt_enable(handle, mbox_chan_id, acpm_sensor_id,
+ twd->inten);
+ return ret;
+}
+
+static int acpm_tmu_initialize_walk_cb(struct thermal_trip *trip, void *data)
+{
+ struct acpm_tmu_initialize_tripwalkdata * const twd = data;
+ int i;
+
+ if (twd->i >= ARRAY_SIZE(twd->threshold))
+ return -ERANGE;
+
+ if (trip->type == THERMAL_TRIP_PASSIVE)
+ goto out;
+
+ i = twd->i;
+
+ twd->threshold[i] = trip->temperature / MILLIDEGREE_PER_DEGREE;
+ twd->hysteresis[i] = trip->hysteresis / MILLIDEGREE_PER_DEGREE;
+
+ twd->inten |= BIT(i);
+
+out:
+ ++twd->i;
+ return 0;
+}
+
+static int acpm_tmu_init_sensors(struct acpm_tmu_priv *priv)
+{
+ int i, ret;
+
+ for (i = 0; i < priv->num_sensors; i++) {
+ struct acpm_tmu_sensor *sensor = &priv->sensors[i];
+ struct acpm_tmu_initialize_tripwalkdata twd = {};
+
+ /* Skip sensors that weren't found in DT */
+ if (!sensor->tzd)
+ continue;
+
+ thermal_zone_for_each_trip(sensor->tzd,
+ acpm_tmu_initialize_walk_cb, &twd);
+
+ ret = acpm_tmu_init_sensor(sensor, &twd);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id acpm_tmu_match[] = {
+ { .compatible = "google,gs101-tmu-top" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, acpm_tmu_match);
+
+static int acpm_tmu_probe(struct platform_device *pdev)
+{
+ const struct acpm_tmu_driver_data *data = &acpm_tmu_gs101;
+ const struct acpm_handle *acpm_handle;
+ struct device *dev = &pdev->dev;
+ struct acpm_tmu_priv *priv;
+ struct regmap *regmap;
+ void __iomem *base;
+ int i, ret;
+
+ acpm_handle = devm_acpm_get_by_phandle(dev);
+ if (IS_ERR(acpm_handle))
+ return dev_err_probe(dev, PTR_ERR(acpm_handle),
+ "Failed to get ACPM handle\n");
+
+ priv = devm_kzalloc(dev,
+ struct_size(priv, sensors, data->num_sensor_groups),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+ priv->handle = acpm_handle;
+ priv->mbox_chan_id = data->mbox_chan_id;
+ priv->num_sensors = data->num_sensor_groups;
+
+ platform_set_drvdata(pdev, priv);
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return dev_err_probe(dev, PTR_ERR(base), "Failed to ioremap resource\n");
+
+ regmap = devm_regmap_init_mmio(dev, base, &gs101_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
+
+ ret = devm_regmap_field_bulk_alloc(dev, regmap, priv->regmap_fields,
+ data->reg_fields, REG_INTPEND_COUNT);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Unable to map syscon registers\n");
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk))
+ return dev_err_probe(dev, PTR_ERR(priv->clk),
+ "Failed to get the clock\n");
+
+ priv->irq = platform_get_irq(pdev, 0);
+ if (priv->irq < 0)
+ return dev_err_probe(dev, priv->irq, "Failed to get irq\n");
+
+ ret = devm_request_threaded_irq(dev, priv->irq, NULL,
+ acpm_tmu_thread_fn, IRQF_ONESHOT,
+ dev_name(dev), priv);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to request irq\n");
+
+ pm_runtime_set_autosuspend_delay(dev, 100);
+ pm_runtime_use_autosuspend(dev);
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to enable runtime PM\n");
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "Failed to resume device\n");
+
+ ret = acpm_handle->ops.tmu.init(acpm_handle, priv->mbox_chan_id);
+ if (ret) {
+ ret = dev_err_probe(dev, ret, "Failed to init TMU\n");
+ goto err_pm_put;
+ }
+
+ for (i = 0; i < priv->num_sensors; i++) {
+ struct acpm_tmu_sensor *sensor = &priv->sensors[i];
+
+ mutex_init(&sensor->lock);
+ sensor->group = &data->sensor_groups[i];
+ sensor->priv = priv;
+
+ sensor->tzd = devm_thermal_of_zone_register(dev, i, sensor,
+ &acpm_tmu_sensor_ops);
+ if (IS_ERR(sensor->tzd)) {
+ ret = PTR_ERR(sensor->tzd);
+ if (ret == -ENODEV) {
+ sensor->tzd = NULL;
+ dev_dbg(dev, "Sensor %d not used in DT, skipping\n", i);
+ continue;
+ }
+
+ ret = dev_err_probe(dev, ret, "Failed to register sensor %d\n", i);
+ goto err_pm_put;
+ }
+
+ ret = devm_thermal_add_hwmon_sysfs(dev, sensor->tzd);
+ if (ret)
+ dev_warn(dev, "Failed to add hwmon sysfs!\n");
+ }
+
+ ret = acpm_tmu_init_sensors(priv);
+ if (ret) {
+ ret = dev_err_probe(dev, ret, "Failed to init sensors\n");
+ goto err_pm_put;
+ }
+
+ ret = acpm_tmu_control(priv, true);
+ if (ret) {
+ ret = dev_err_probe(dev, ret, "Failed to enable TMU\n");
+ goto err_pm_put;
+ }
+
+ pm_runtime_put_autosuspend(&pdev->dev);
+
+ return 0;
+
+err_pm_put:
+ pm_runtime_put_sync(dev);
+ return ret;
+}
+
+static void acpm_tmu_remove(struct platform_device *pdev)
+{
+ struct acpm_tmu_priv *priv = platform_get_drvdata(pdev);
+
+ /* Stop IRQ first to prevent race with thread_fn */
+ disable_irq(priv->irq);
+
+ acpm_tmu_control(priv, false);
+}
+
+static int acpm_tmu_suspend(struct device *dev)
+{
+ struct acpm_tmu_priv *priv = dev_get_drvdata(dev);
+ const struct acpm_handle *handle = priv->handle;
+ const struct acpm_tmu_ops *ops = &handle->ops.tmu;
+ int ret;
+
+ ret = acpm_tmu_control(priv, false);
+ if (ret)
+ return ret;
+
+ /* APB clock not required for this specific msg */
+ return ops->suspend(handle, priv->mbox_chan_id);
+}
+
+static int acpm_tmu_resume(struct device *dev)
+{
+ struct acpm_tmu_priv *priv = dev_get_drvdata(dev);
+ const struct acpm_handle *handle = priv->handle;
+ const struct acpm_tmu_ops *ops = &handle->ops.tmu;
+ int ret;
+
+ /* APB clock not required for this specific msg */
+ ret = ops->resume(handle, priv->mbox_chan_id);
+ if (ret)
+ return ret;
+
+ return acpm_tmu_control(priv, true);
+}
+
+static int acpm_tmu_runtime_suspend(struct device *dev)
+{
+ struct acpm_tmu_priv *priv = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(priv->clk);
+
+ return 0;
+}
+
+static int acpm_tmu_runtime_resume(struct device *dev)
+{
+ struct acpm_tmu_priv *priv = dev_get_drvdata(dev);
+
+ return clk_prepare_enable(priv->clk);
+}
+
+static const struct dev_pm_ops acpm_tmu_pm_ops = {
+ SYSTEM_SLEEP_PM_OPS(acpm_tmu_suspend, acpm_tmu_resume)
+ RUNTIME_PM_OPS(acpm_tmu_runtime_suspend, acpm_tmu_runtime_resume, NULL)
+};
+
+static struct platform_driver acpm_tmu_driver = {
+ .driver = {
+ .name = "gs-tmu",
+ .pm = pm_ptr(&acpm_tmu_pm_ops),
+ .of_match_table = acpm_tmu_match,
+ },
+ .probe = acpm_tmu_probe,
+ .remove = acpm_tmu_remove,
+};
+module_platform_driver(acpm_tmu_driver);
+
+MODULE_AUTHOR("Tudor Ambarus <tudor.ambarus@linaro.org>");
+MODULE_DESCRIPTION("Samsung Exynos ACPM TMU Driver");
+MODULE_LICENSE("GPL");

--
2.52.0.457.g6b5491de43-goog