wifi: mt76: support per-band MAC addresses from OF child nodes

Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml

@@ -37,6 +37,12 @@ properties:
     description:
       MT7986 should contain 3 regions consys, dcm, and sku, in this order.
 
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
   interrupts:
     maxItems: 1
 
@@ -72,13 +78,23 @@ properties:
 
   ieee80211-freq-limit: true
 
+  address: true
+
+  local-mac-address: true
+
+  mac-address: true
+
   nvmem-cells:
+    minItems: 1
     items:
       - description: NVMEM cell with EEPROM
+      - description: NVMEM cell with the MAC address
 
   nvmem-cell-names:
+    minItems: 1
     items:
       - const: eeprom
+      - const: mac-address
 
   mediatek,eeprom-data:
     $ref: /schemas/types.yaml#/definitions/uint32-array
@@ -213,6 +229,29 @@ properties:
                     description:
                       Half-dBm power delta for different numbers of antennas
 
+patternProperties:
+  '^band@[0-2]+$':
+    type: object
+    additionalProperties: false
+    properties:
+      reg:
+        maxItems: 1
+
+      address: true
+      local-mac-address: true
+      mac-address: true
+
+      nvmem-cells:
+        description: NVMEM cell with the MAC address
+
+      nvmem-cell-names:
+        const: mac-address
+
+    required:
+      - reg
+
+    unevaluatedProperties: false
+
 required:
   - compatible
   - reg
@@ -225,10 +264,13 @@ examples:
       #address-cells = <3>;
       #size-cells = <2>;
       wifi@0,0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
         compatible = "mediatek,mt76";
         reg = <0x0000 0 0 0 0>;
         ieee80211-freq-limit = <5000000 6000000>;
-        mediatek,mtd-eeprom = <&factory 0x8000>;
+        nvmem-cells = <&factory_eeprom>;
+        nvmem-cell-names = "eeprom";
         big-endian;
 
         led {
@@ -257,6 +299,20 @@ examples:
              };
           };
         };
+
+        band@0 {
+          /* 2.4 GHz */
+          reg = <0>;
+          nvmem-cells = <&macaddr 0x4>;
+          nvmem-cell-names = "mac-address";
+        };
+
+        band@1 {
+          /* 5 GHz */
+          reg = <1>;
+          nvmem-cells = <&macaddr 0xa>;
+          nvmem-cell-names = "mac-address";
+        };
       };
     };
 

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

@@ -161,9 +161,25 @@ void
 mt76_eeprom_override(struct mt76_phy *phy)
 {
 	struct mt76_dev *dev = phy->dev;
-	struct device_node *np = dev->dev->of_node;
+	struct device_node *np = dev->dev->of_node, *band_np;
+	bool found_mac = false;
+	u32 reg;
+	int ret;
+
+	for_each_child_of_node(np, band_np) {
+		ret = of_property_read_u32(band_np, "reg", &reg);
+		if (ret)
+			continue;
+
+		if (reg == phy->band_idx) {
+			found_mac = !of_get_mac_address(band_np, phy->macaddr);
+			of_node_put(band_np);
+			break;
+		}
+	}
 
-	of_get_mac_address(np, phy->macaddr);
+	if (!found_mac)
+		of_get_mac_address(np, phy->macaddr);
 
 	if (!is_valid_ether_addr(phy->macaddr)) {
 		eth_random_addr(phy->macaddr);