mt76: mt7615: introduce mt7615_regd_notifier

Introduce mt7615_regd_notifier callback. This is a preliminary patch to
add radar detection support to mt7615 driver
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/init.c

@@ -208,6 +208,16 @@ mt7615_init_txpower(struct mt7615_dev *dev,
 	}
 }
 
+static void
+mt7615_regd_notifier(struct wiphy *wiphy,
+		     struct regulatory_request *request)
+{
+	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
+	struct mt7615_dev *dev = hw->priv;
+
+	dev->mt76.region = request->dfs_region;
+}
+
 int mt7615_register_device(struct mt7615_dev *dev)
 {
 	struct ieee80211_hw *hw = mt76_hw(dev);
@@ -230,6 +240,7 @@ int mt7615_register_device(struct mt7615_dev *dev)
 
 	wiphy->iface_combinations = if_comb;
 	wiphy->n_iface_combinations = ARRAY_SIZE(if_comb);
+	wiphy->reg_notifier = mt7615_regd_notifier;
 
 	ieee80211_hw_set(hw, SUPPORTS_REORDERING_BUFFER);
 	ieee80211_hw_set(hw, TX_STATUS_NO_AMPDU_LEN);