[PATCH 1/2] firmware: arm_scmi: bus: Add pm ops

Peng Fan (OSS)
2025-06-20T03:43:43Z

From: Peng Fan <peng.fan@nxp.com>

Take platform_pm_ops as reference. Add pm ops for scmi_bus_type,
then the scmi devices under scmi bus could have their own hooks for
suspend, resume function.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/firmware/arm_scmi/bus.c | 45 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)

diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
index 1adef03894751dae9bb752b8c7f86e5d01c5d4fd..2d1ef73cb6d39ac611afa5d0008c46515e297b93 100644
--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -323,6 +323,50 @@ static struct attribute *scmi_device_attributes_attrs[] = {
};
ATTRIBUTE_GROUPS(scmi_device_attributes);

+#ifdef CONFIG_SUSPEND
+static int scmi_pm_suspend(struct device *dev)
+{
+ const struct device_driver *drv = dev->driver;
+ int ret = 0;
+
+ if (!drv)
+ return 0;
+
+ if (drv->pm) {
+ if (drv->pm->suspend)
+ ret = drv->pm->suspend(dev);
+ }
+
+ return ret;
+}
+
+static int scmi_pm_resume(struct device *dev)
+{
+ const struct device_driver *drv = dev->driver;
+ int ret = 0;
+
+ if (!drv)
+ return 0;
+
+ if (drv->pm) {
+ if (drv->pm->resume)
+ ret = drv->pm->resume(dev);
+ }
+
+ return ret;
+}
+
+static const struct dev_pm_ops scmi_dev_pm_ops = {
+ .suspend = scmi_pm_suspend,
+ .resume = scmi_pm_resume,
+};
+#else
+static const struct dev_pm_ops scmi_dev_pm_ops = {
+ .suspend = NULL,
+ .resume = NULL,
+};
+#endif
+
const struct bus_type scmi_bus_type = {
.name = "scmi_protocol",
.match = scmi_dev_match,
@@ -330,6 +374,7 @@ const struct bus_type scmi_bus_type = {
.remove = scmi_dev_remove,
.uevent = scmi_device_uevent,
.dev_groups = scmi_device_attributes_groups,
+ .pm = &scmi_dev_pm_ops,
};
EXPORT_SYMBOL_GPL(scmi_bus_type);

--
2.37.1