wcn36xx: Disable 5GHz for wcn3620

wcn3620 can only operate on 2.4GHz band due to RF limitation.
If wcn36xx digital block is associated with an external IRIS
RF module, retrieve the id and disable 5GHz band in case of
wcn3620 id.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/wcn36xx/main.c

@@ -1136,6 +1136,7 @@ static int wcn36xx_init_ieee80211(struct wcn36xx *wcn)
 		BIT(NL80211_IFTYPE_MESH_POINT);
 
 	wcn->hw->wiphy->bands[NL80211_BAND_2GHZ] = &wcn_band_2ghz;
+	if (wcn->rf_id != RF_IRIS_WCN3620)
 		wcn->hw->wiphy->bands[NL80211_BAND_5GHZ] = &wcn_band_5ghz;
 
 	wcn->hw->wiphy->max_scan_ssids = WCN36XX_MAX_SCAN_SSIDS;
@@ -1169,6 +1170,7 @@ static int wcn36xx_platform_get_resources(struct wcn36xx *wcn,
 					  struct platform_device *pdev)
 {
 	struct device_node *mmio_node;
+	struct device_node *iris_node;
 	struct resource *res;
 	int index;
 	int ret;
@@ -1231,6 +1233,14 @@ static int wcn36xx_platform_get_resources(struct wcn36xx *wcn,
 		goto unmap_ccu;
 	}
 
+	/* External RF module */
+	iris_node = of_find_node_by_name(mmio_node, "iris");
+	if (iris_node) {
+		if (of_device_is_compatible(iris_node, "qcom,wcn3620"))
+			wcn->rf_id = RF_IRIS_WCN3620;
+		of_node_put(iris_node);
+	}
+
 	of_node_put(mmio_node);
 	return 0;
 

drivers/net/wireless/ath/wcn36xx/wcn36xx.h

@@ -94,6 +94,9 @@ enum wcn36xx_ampdu_state {
 #define WCN36XX_FLAGS(__wcn) (__wcn->hw->flags)
 #define WCN36XX_MAX_POWER(__wcn) (__wcn->hw->conf.chandef.chan->max_power)
 
+#define RF_UNKNOWN	0x0000
+#define RF_IRIS_WCN3620	0x3620
+
 static inline void buff_to_be(u32 *buf, size_t len)
 {
 	int i;
@@ -241,6 +244,9 @@ struct wcn36xx {
 
 	struct sk_buff		*tx_ack_skb;
 
+	/* RF module */
+	unsigned		rf_id;
+
 #ifdef CONFIG_WCN36XX_DEBUGFS
 	/* Debug file system entry */
 	struct wcn36xx_dfs_entry    dfs;