[PATCH 3/4] arm64: dts: mediatek: mt7981b: add 'serial' cell to efuse

[Daniel Golle]

The efuse of the MediaTek MT7981 contains a 16-byte unique identifier.
Add a 'serial' cell covering those 16 bytes to the nvmem defininition of
the efuse to allow easy access from userspace, eg. to generate a
persistent random MAC address on boards which don't have any
factory-assigned addresses.

Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 arch/arm64/boot/dts/mediatek/mt7981b.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
index 277c11247c13..bffbe9a1d836 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
@@ -237,6 +237,10 @@ efuse at 11f20000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 
+			serial at 140 {
+				reg = <0x140 0x10>;
+			};
+
 			thermal_calibration: thermal-calib at 274 {
 				reg = <0x274 0xc>;
 			};
-- 
2.51.0