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firmware: arm_scmi: Add power management operations to SCMI bus

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Introduce suspend and resume power management callbacks for `scmi_bus_type`,
modeled after `platform_pm_ops`. This enables SCMI devices on the bus to
implement their own suspend and resume behavior, allowing for more
fine-grained power control at the device level.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Message-Id: <20250704-scmi-pm-v2-1-9316cec2f9cc@nxp.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Peng Fan 2025-07-04 11:09:35 +08:00 committed by Sudeep Holla
parent f8e656382b
commit 76e65f7a0e
1 changed files with 26 additions and 0 deletions
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26
drivers/firmware/arm_scmi/bus.c
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@ -323,6 +323,31 @@ static struct attribute *scmi_device_attributes_attrs[] = {
};
ATTRIBUTE_GROUPS(scmi_device_attributes);
static int scmi_pm_suspend(struct device *dev)
{
const struct device_driver *drv = dev->driver;
if (drv && drv->pm && drv->pm->suspend)
return drv->pm->suspend(dev);
return 0;
}
static int scmi_pm_resume(struct device *dev)
{
const struct device_driver *drv = dev->driver;
if (drv && drv->pm && drv->pm->resume)
return drv->pm->resume(dev);
return 0;
}
static const struct dev_pm_ops scmi_dev_pm_ops = {
.suspend = pm_sleep_ptr(scmi_pm_suspend),
.resume = pm_sleep_ptr(scmi_pm_resume),
};
const struct bus_type scmi_bus_type = {
.name = "scmi_protocol",
.match = scmi_dev_match,
@ -330,6 +355,7 @@ 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);