linux-kernel - [PATCH v2 3/3] ARM: dts: microchip: sama5d29_curiosity: Add nvmem-layout in QSPI for EUI48 MAC Address

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Message-ID: <20250326072140.172244-4-manikandan.m@microchip.com>
Date: Wed, 26 Mar 2025 12:51:40 +0530
From: Manikandan Muralidharan <manikandan.m@...rochip.com>
To: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>, <tudor.ambarus@...aro.org>,
	<pratyush@...nel.org>, <mwalle@...nel.org>, <miquel.raynal@...tlin.com>,
	<richard@....at>, <vigneshr@...com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-mtd@...ts.infradead.org>
CC: <manikandan.m@...rochip.com>
Subject: [PATCH v2 3/3] ARM: dts: microchip: sama5d29_curiosity: Add nvmem-layout in QSPI for EUI48 MAC Address

Add nvmem-layout in QSPI to read the EUI48 Mac address by the
net drivers using the nvmem property.The offset is set to 0x0
since the factory programmed address is available in the
resource managed space and the size determine if the requested
address is of EUI48 (0x6) or EUI-64 (0x8) type.
This is useful for cases where U-Boot is skipped and the Ethernet
MAC address is needed to be configured by the kernel

Signed-off-by: Manikandan Muralidharan <manikandan.m@...rochip.com>
---
 .../arm/boot/dts/microchip/at91-sama5d29_curiosity.dts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
index 35756cc01e68..6c5ff08f0b3f 100644
--- a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
+++ b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
@@ -478,6 +478,16 @@ flash@0 {
 		label = "atmel_qspi1";
 		status = "okay";
 
+		nvmem-layout {
+			compatible = "fixed-layout";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			mac_address_eui48: mac-address@0 {
+				reg = <0x0 0x6>;
+			};
+		};
+
 		partitions {
 			compatible = "fixed-partitions";
 			#address-cells = <1>;
-- 
2.25.1