brcmfmac: allow setting wlan MAC address using device tree

This allows firmware to provide MAC address using device tree. Like in
case there is no MAC burned in wlan NVRAM.
Signed-off-by: Pavel Löbl <pavel@loebl.cz>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220506044246.67146-1-pavel@loebl.cz

drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c

@@ -202,13 +202,24 @@ int brcmf_c_preinit_dcmds(struct brcmf_if *ifp)
 	char *ptr;
 	s32 err;
 
-	/* retreive mac address */
-	err = brcmf_fil_iovar_data_get(ifp, "cur_etheraddr", ifp->mac_addr,
-				       sizeof(ifp->mac_addr));
-	if (err < 0) {
-		bphy_err(drvr, "Retrieving cur_etheraddr failed, %d\n", err);
-		goto done;
+	if (is_valid_ether_addr(ifp->mac_addr)) {
+		/* set mac address */
+		err = brcmf_fil_iovar_data_set(ifp, "cur_etheraddr", ifp->mac_addr,
+					       ETH_ALEN);
+		if (err < 0) {
+			bphy_err(ifp->drvr, "Setting cur_etheraddr failed, %d\n", err);
+			goto done;
+		}
+	} else {
+		/* retrieve mac address */
+		err = brcmf_fil_iovar_data_get(ifp, "cur_etheraddr", ifp->mac_addr,
+					       sizeof(ifp->mac_addr));
+		if (err < 0) {
+			bphy_err(drvr, "Retrieving cur_etheraddr failed, %d\n", err);
+			goto done;
+		}
 	}
+
 	memcpy(ifp->drvr->mac, ifp->mac_addr, sizeof(ifp->drvr->mac));
 	memcpy(ifp->drvr->wiphy->perm_addr, ifp->drvr->mac, ETH_ALEN);
 

drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h

@@ -50,6 +50,7 @@ struct brcmf_mp_device {
 	bool		ignore_probe_fail;
 	struct brcmfmac_pd_cc *country_codes;
 	const char	*board_type;
+	unsigned char	mac[ETH_ALEN];
 	union {
 		struct brcmfmac_sdio_pd sdio;
 	} bus;

drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c

@@ -7,6 +7,7 @@
 #include <linux/etherdevice.h>
 #include <linux/module.h>
 #include <linux/inetdevice.h>
+#include <linux/property.h>
 #include <net/cfg80211.h>
 #include <net/rtnetlink.h>
 #include <net/addrconf.h>
@@ -1197,7 +1198,8 @@ static int brcmf_bus_started(struct brcmf_pub *drvr, struct cfg80211_ops *ops)
 	brcmf_dbg(TRACE, "\n");
 
 	/* add primary networking interface */
-	ifp = brcmf_add_if(drvr, 0, 0, false, "wlan%d", NULL);
+	ifp = brcmf_add_if(drvr, 0, 0, false, "wlan%d",
+			   is_valid_ether_addr(drvr->settings->mac) ? drvr->settings->mac : NULL);
 	if (IS_ERR(ifp))
 		return PTR_ERR(ifp);
 

drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c

@@ -5,6 +5,7 @@
 #include <linux/init.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
+#include <linux/of_net.h>
 
 #include <defs.h>
 #include "debug.h"
@@ -99,6 +100,8 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 	if (err)
 		brcmf_err("failed to get OF country code map (err=%d)\n", err);
 
+	of_get_mac_address(np, settings->mac);
+
 	if (bus_type != BRCMF_BUSTYPE_SDIO)
 		return;