firmware: arm_scmi: Emit modalias for SCMI devices

In order to enable libkmod lookups for SCMI device objects to their
corresponding module, add 'modalias' to the base attribute of SCMI
devices.

Message-Id: <20250131141822.514342-3-sudeep.holla@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
index 862dd34eca624fc25673bd7c1c316871d2275b42..7af01664ce7e2f606b17ea416bf354b2cb9d6a49 100644 (file)
--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -287,6 +287,17 @@ static int scmi_device_uevent(const struct device *dev, struct kobj_uevent_env *
                              scmi_dev->name);
 }
 
+static ssize_t modalias_show(struct device *dev,
+                            struct device_attribute *attr, char *buf)
+{
+       struct scmi_device *scmi_dev = to_scmi_dev(dev);
+
+       return sysfs_emit(buf, SCMI_UEVENT_MODALIAS_FMT,
+                         dev_name(&scmi_dev->dev), scmi_dev->protocol_id,
+                         scmi_dev->name);
+}
+static DEVICE_ATTR_RO(modalias);
+
 static ssize_t protocol_id_show(struct device *dev,
                                 struct device_attribute *attr, char *buf)
 {
@@ -308,6 +319,7 @@ static DEVICE_ATTR_RO(name);
 static struct attribute *scmi_device_attributes_attrs[] = {
        &dev_attr_protocol_id.attr,
        &dev_attr_name.attr,
+       &dev_attr_modalias.attr,
        NULL,
 };
 ATTRIBUTE_GROUPS(scmi_device_attributes);