mt76: allow to identify bus

Add helpers to identify bus type.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mmio.c

@@ -79,6 +79,7 @@ void mt76_mmio_init(struct mt76_dev *dev, void __iomem *regs)
 		.copy = mt76_mmio_copy,
 		.wr_rp = mt76_mmio_wr_rp,
 		.rd_rp = mt76_mmio_rd_rp,
+		.type = MT76_BUS_MMIO,
 	};
 
 	dev->bus = &mt76_mmio_ops;

drivers/net/wireless/mediatek/mt76/mt76.h

@@ -38,6 +38,11 @@ struct mt76_reg_pair {
 	u32 value;
 };
 
+enum mt76_bus_type {
+	MT76_BUS_MMIO,
+	MT76_BUS_USB,
+};
+
 struct mt76_bus_ops {
 	u32 (*rr)(struct mt76_dev *dev, u32 offset);
 	void (*wr)(struct mt76_dev *dev, u32 offset, u32 val);
@@ -48,8 +53,12 @@ struct mt76_bus_ops {
 		     const struct mt76_reg_pair *rp, int len);
 	int (*rd_rp)(struct mt76_dev *dev, u32 base,
 		     struct mt76_reg_pair *rp, int len);
+	enum mt76_bus_type type;
 };
 
+#define mt76_is_usb(dev) ((dev)->mt76.bus->type == MT76_BUS_USB)
+#define mt76_is_mmio(dev) ((dev)->mt76.bus->type == MT76_BUS_MMIO)
+
 enum mt76_txq_id {
 	MT_TXQ_VO = IEEE80211_AC_VO,
 	MT_TXQ_VI = IEEE80211_AC_VI,

drivers/net/wireless/mediatek/mt76/usb.c

@@ -862,6 +862,7 @@ int mt76u_init(struct mt76_dev *dev,
 		.copy = mt76u_copy,
 		.wr_rp = mt76u_wr_rp,
 		.rd_rp = mt76u_rd_rp,
+		.type = MT76_BUS_USB,
 	};
 	struct mt76_usb *usb = &dev->usb;