wifi: mt76: add support for allocating a phy without hw

Preparation for supporting a single hw with multiple radios

Link: https://patch.msgid.link/20250102163508.52945-2-nbd@nbd.name
Signed-off-by: Felix Fietkau <nbd@nbd.name>

2 files changed, 36 insertions, 5 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index 69fcea08e3fd..5a77f94b7f82 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -411,13 +411,15 @@ mt76_check_sband(struct mt76_phy *phy, struct mt76_sband *msband,
 	}
 
 	if (found) {
-		phy->chandef.chan = &sband->channels[0];
+		cfg80211_chandef_create(&phy->chandef, &sband->channels[0],
+					NL80211_CHAN_HT20);
 		phy->chan_state = &msband->chan[0];
 		return;
 	}
 
 	sband->n_channels = 0;
-	phy->hw->wiphy->bands[band] = NULL;
+	if (phy->hw->wiphy->bands[band] == sband)
+		phy->hw->wiphy->bands[band] = NULL;
 }
 
 static int
@@ -429,6 +431,9 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
 	INIT_LIST_HEAD(&phy->tx_list);
 	spin_lock_init(&phy->tx_lock);
 
+	if ((void *)phy != hw->priv)
+		return 0;
+
 	SET_IEEE80211_DEV(hw, dev->dev);
 	SET_IEEE80211_PERM_ADDR(hw, phy->macaddr);
 
@@ -481,6 +486,28 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
 }
 
 struct mt76_phy *
+mt76_alloc_radio_phy(struct mt76_dev *dev, unsigned int size,
+		     u8 band_idx)
+{
+	struct ieee80211_hw *hw = dev->phy.hw;
+	unsigned int phy_size;
+	struct mt76_phy *phy;
+
+	phy_size = ALIGN(sizeof(*phy), 8);
+	phy = devm_kzalloc(dev->dev, size + phy_size, GFP_KERNEL);
+	if (!phy)
+		return NULL;
+
+	phy->dev = dev;
+	phy->hw = hw;
+	phy->priv = (void *)phy + phy_size;
+	phy->band_idx = band_idx;
+
+	return phy;
+}
+EXPORT_SYMBOL_GPL(mt76_alloc_radio_phy);
+
+struct mt76_phy *
 mt76_alloc_phy(struct mt76_dev *dev, unsigned int size,
 	       const struct ieee80211_ops *ops, u8 band_idx)
 {
@@ -552,9 +579,11 @@ int mt76_register_phy(struct mt76_phy *phy, bool vht,
 	mt76_check_sband(phy, &phy->sband_5g, NL80211_BAND_5GHZ);
 	mt76_check_sband(phy, &phy->sband_6g, NL80211_BAND_6GHZ);
 
-	ret = ieee80211_register_hw(phy->hw);
-	if (ret)
-		return ret;
+	if ((void *)phy == phy->hw->priv) {
+		ret = ieee80211_register_hw(phy->hw);
+		if (ret)
+			return ret;
+	}
 
 	set_bit(MT76_STATE_REGISTERED, &phy->state);
 	phy->dev->phys[phy->band_idx] = phy;
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index b649039f384b..aac8ca7265c2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -1177,6 +1177,8 @@ void mt76_unregister_device(struct mt76_dev *dev);
 void mt76_free_device(struct mt76_dev *dev);
 void mt76_unregister_phy(struct mt76_phy *phy);
 
+struct mt76_phy *mt76_alloc_radio_phy(struct mt76_dev *dev, unsigned int size,
+				      u8 band_idx);
 struct mt76_phy *mt76_alloc_phy(struct mt76_dev *dev, unsigned int size,
 				const struct ieee80211_ops *ops,
 				u8 band_idx);