static DEFINE_IDR(scmi_requested_devices);
static DEFINE_MUTEX(scmi_requested_devices_mtx);
+/* Track globally the creation of SCMI SystemPower related devices */
+static bool scmi_syspower_registered;
+/* Protect access to scmi_syspower_registered */
+static DEFINE_MUTEX(scmi_syspower_mtx);
+
struct scmi_requested_dev {
const struct scmi_device_id *id_table;
struct list_head node;
if (sdev)
return sdev;
+ mutex_lock(&scmi_syspower_mtx);
+ if (prot_id == SCMI_PROTOCOL_SYSTEM && scmi_syspower_registered) {
+ dev_warn(info->dev,
+ "SCMI SystemPower protocol device must be unique !\n");
+ mutex_unlock(&scmi_syspower_mtx);
+
+ return NULL;
+ }
+
pr_debug("Creating SCMI device (%s) for protocol %x\n", name, prot_id);
sdev = scmi_device_create(np, info->dev, prot_id, name);
if (!sdev) {
dev_err(info->dev, "failed to create %d protocol device\n",
prot_id);
+ mutex_unlock(&scmi_syspower_mtx);
+
return NULL;
}
if (scmi_txrx_setup(info, &sdev->dev, prot_id)) {
dev_err(&sdev->dev, "failed to setup transport\n");
scmi_device_destroy(sdev);
+ mutex_unlock(&scmi_syspower_mtx);
+
return NULL;
}
+ if (prot_id == SCMI_PROTOCOL_SYSTEM)
+ scmi_syspower_registered = true;
+
+ mutex_unlock(&scmi_syspower_mtx);
+
return sdev;
}