linux-kernel - [PATCH 1/2] firmware: arm

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Message-Id: <20250620-scmi-pm-v1-1-c2f02cae5122@nxp.com>
Date: Fri, 20 Jun 2025 11:37:13 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: arm-scmi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, 
 Ranjani Vaidyanathan <ranjani.vaidyanathan@....com>, 
 Chuck Cannon <chuck.cannon@....com>, Peng Fan <peng.fan@....com>
Subject: [PATCH 1/2] firmware: arm_scmi: bus: Add pm ops

From: Peng Fan <peng.fan@....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@....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