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From: Manikandan Muralidharan <manikandan.m@microchip.com>
To: <pratyush@kernel.org>, <mwalle@kernel.org>,
	<takahiro.kuwano@infineon.com>, <miquel.raynal@bootlin.com>,
	<richard@nod.at>, <vigneshr@ti.com>, <robh@kernel.org>,
	<krzk+dt@kernel.org>, <conor+dt@kernel.org>, <srini@kernel.org>,
	<nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
	<claudiu.beznea@tuxon.dev>, <linux@armlinux.org.uk>,
	<richardcochran@gmail.com>, <linusw@kernel.org>, <arnd@arndb.de>,
	<michael@walle.cc>, <linux-mtd@lists.infradead.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>, <netdev@vger.kernel.org>
Cc: Manikandan Muralidharan <manikandan.m@microchip.com>
Subject: [PATCH v4 6/7] ARM: dts: microchip: sama5d27_wlsom1: read MAC address from QSPI SFDP
Date: Tue, 30 Jun 2026 14:54:05 +0530	[thread overview]
Message-ID: <20260630092406.150587-7-manikandan.m@microchip.com> (raw)
In-Reply-To: <20260630092406.150587-1-manikandan.m@microchip.com>

Describe the QSPI flash SFDP as an NVMEM provider with the
microchip,sst26vf-sfdp-eui layout, which exposes the factory-programmed
EUI-48 as a "mac-address" cell, and point macb0 at it through
nvmem-cells. This yields a stable MAC address on boards where U-Boot does
not program one, instead of falling back to a random address.

Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
---
 arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi | 11 +++++++++++
 .../boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts    |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi
index 062aa02a98ed..6016d7f2a39c 100644
--- a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi
+++ b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi
@@ -240,6 +240,17 @@ qspi1_flash: flash@0 {
 		m25p,fast-read;
 		status = "disabled";
 
+		sfdp {
+			compatible = "jedec,sfdp";
+
+			nvmem-layout {
+				compatible = "microchip,sst26vf-sfdp-eui";
+
+				mac_address_eui48: mac-address {
+				};
+			};
+		};
+
 		partitions {
 			compatible = "fixed-partitions";
 			#address-cells = <1>;
diff --git a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts
index 35a933eec573..5e87bf04bc47 100644
--- a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts
+++ b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts
@@ -97,6 +97,8 @@ uart6: serial@200 {
 
 &macb0 {
 	status = "okay";
+	nvmem-cells = <&mac_address_eui48>;
+	nvmem-cell-names = "mac-address";
 };
 
 &pioA {
-- 
2.43.0


WARNING: multiple messages have this Message-ID (diff)
From: Manikandan Muralidharan <manikandan.m@microchip.com>
To: <pratyush@kernel.org>, <mwalle@kernel.org>,
	<takahiro.kuwano@infineon.com>, <miquel.raynal@bootlin.com>,
	<richard@nod.at>, <vigneshr@ti.com>, <robh@kernel.org>,
	<krzk+dt@kernel.org>, <conor+dt@kernel.org>, <srini@kernel.org>,
	<nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
	<claudiu.beznea@tuxon.dev>, <linux@armlinux.org.uk>,
	<richardcochran@gmail.com>, <linusw@kernel.org>, <arnd@arndb.de>,
	<michael@walle.cc>, <linux-mtd@lists.infradead.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>, <netdev@vger.kernel.org>
Cc: Manikandan Muralidharan <manikandan.m@microchip.com>
Subject: [PATCH v4 6/7] ARM: dts: microchip: sama5d27_wlsom1: read MAC address from QSPI SFDP
Date: Tue, 30 Jun 2026 14:54:05 +0530	[thread overview]
Message-ID: <20260630092406.150587-7-manikandan.m@microchip.com> (raw)
In-Reply-To: <20260630092406.150587-1-manikandan.m@microchip.com>

Describe the QSPI flash SFDP as an NVMEM provider with the
microchip,sst26vf-sfdp-eui layout, which exposes the factory-programmed
EUI-48 as a "mac-address" cell, and point macb0 at it through
nvmem-cells. This yields a stable MAC address on boards where U-Boot does
not program one, instead of falling back to a random address.

Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
---
 arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi | 11 +++++++++++
 .../boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts    |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi
index 062aa02a98ed..6016d7f2a39c 100644
--- a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi
+++ b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1.dtsi
@@ -240,6 +240,17 @@ qspi1_flash: flash@0 {
 		m25p,fast-read;
 		status = "disabled";
 
+		sfdp {
+			compatible = "jedec,sfdp";
+
+			nvmem-layout {
+				compatible = "microchip,sst26vf-sfdp-eui";
+
+				mac_address_eui48: mac-address {
+				};
+			};
+		};
+
 		partitions {
 			compatible = "fixed-partitions";
 			#address-cells = <1>;
diff --git a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts
index 35a933eec573..5e87bf04bc47 100644
--- a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts
+++ b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts
@@ -97,6 +97,8 @@ uart6: serial@200 {
 
 &macb0 {
 	status = "okay";
+	nvmem-cells = <&mac_address_eui48>;
+	nvmem-cell-names = "mac-address";
 };
 
 &pioA {
-- 
2.43.0


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Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

  parent reply	other threads:[~2026-06-30  9:26 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-30  9:23 [PATCH v4 0/7] Read MAC address from SST vendor specific SFDP region Manikandan Muralidharan
2026-06-30  9:23 ` Manikandan Muralidharan
2026-06-30  9:24 ` [PATCH v4 1/7] dt-bindings: mtd: jedec,spi-nor: allow the SFDP to be exposed via NVMEM Manikandan Muralidharan
2026-06-30  9:24   ` Manikandan Muralidharan
2026-06-30 22:12   ` Linus Walleij
2026-06-30 22:12     ` Linus Walleij
2026-07-01  8:34     ` Michael Walle
2026-07-01  8:34       ` Michael Walle
2026-07-01 10:53       ` Linus Walleij
2026-07-01 10:53         ` Linus Walleij
2026-07-02  6:13         ` Manikandan.M
2026-07-02  6:13           ` Manikandan.M
2026-07-02  6:16   ` Krzysztof Kozlowski
2026-07-02  6:16     ` Krzysztof Kozlowski
2026-07-02  6:55     ` Manikandan.M
2026-07-02  6:55       ` Manikandan.M
2026-07-02 16:37       ` Rob Herring
2026-07-02 16:37         ` Rob Herring
2026-07-03 10:10         ` Miquel Raynal
2026-07-03 10:10           ` Miquel Raynal
2026-07-03 13:05           ` Michael Walle
2026-07-03 13:05             ` Michael Walle
2026-06-30  9:24 ` [PATCH v4 2/7] dt-bindings: nvmem: layouts: add Microchip/SST SFDP EUI layout Manikandan Muralidharan
2026-06-30  9:24   ` Manikandan Muralidharan
2026-06-30  9:24 ` [PATCH v4 3/7] mtd: spi-nor: sfdp: expose the SFDP as a read-only NVMEM device Manikandan Muralidharan
2026-06-30  9:24   ` Manikandan Muralidharan
2026-06-30 22:25   ` Linus Walleij
2026-06-30 22:25     ` Linus Walleij
2026-07-03  5:35   ` Takahiro.Kuwano
2026-07-03  5:35     ` Takahiro.Kuwano
2026-07-03  9:21     ` Takahiro.Kuwano
2026-07-03  9:21       ` Takahiro.Kuwano
2026-06-30  9:24 ` [PATCH v4 4/7] nvmem: layouts: add Microchip/SST SFDP EUI layout driver Manikandan Muralidharan
2026-06-30  9:24   ` Manikandan Muralidharan
2026-06-30  9:24 ` [PATCH v4 5/7] ARM: dts: microchip: sama5d27_wlsom1: use fixed-partitions for QSPI flash Manikandan Muralidharan
2026-06-30  9:24   ` Manikandan Muralidharan
2026-06-30 22:27   ` Linus Walleij
2026-06-30 22:27     ` Linus Walleij
2026-06-30  9:24 ` Manikandan Muralidharan [this message]
2026-06-30  9:24   ` [PATCH v4 6/7] ARM: dts: microchip: sama5d27_wlsom1: read MAC address from QSPI SFDP Manikandan Muralidharan
2026-06-30  9:24 ` [PATCH v4 7/7] ARM: configs: sama5: enable Microchip/SST SFDP EUI NVMEM layout Manikandan Muralidharan
2026-06-30  9:24   ` Manikandan Muralidharan

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