netdev - [PATCH v2 10/15] arm64: dts: mediatek: mt7981b-openwrt-one: Enable SPI NOR

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Message-Id: <20251101-openwrt-one-network-v2-10-2a162b9eea91@collabora.com>
Date: Sat, 01 Nov 2025 14:32:55 +0100
From: Sjoerd Simons <sjoerd@...labora.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Ryder Lee <ryder.lee@...iatek.com>, 
 Jianjun Wang <jianjun.wang@...iatek.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 Manivannan Sadhasivam <mani@...nel.org>, 
 Chunfeng Yun <chunfeng.yun@...iatek.com>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Lee Jones <lee@...nel.org>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Lorenzo Bianconi <lorenzo@...nel.org>, Felix Fietkau <nbd@....name>
Cc: kernel@...labora.com, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-pci@...r.kernel.org, 
 linux-phy@...ts.infradead.org, netdev@...r.kernel.org, 
 Daniel Golle <daniel@...rotopia.org>, Bryan Hinton <bryan@...anhinton.com>, 
 Sjoerd Simons <sjoerd@...labora.com>
Subject: [PATCH v2 10/15] arm64: dts: mediatek: mt7981b-openwrt-one: Enable
 SPI NOR

The openwrt one has a SPI NOR flash which from factory is used for:
* Recovery system
* WiFi eeprom data
* ethernet Mac addresses

Describe this following the same partitions as the openwrt configuration
uses.

Signed-off-by: Sjoerd Simons <sjoerd@...labora.com>
---
V1 -> V2:
  - Use numeric drive-strength values rather then defines
  - Make nvmem cell labers more meaningfull
  - Only define nvmem cells used in later patches by devicetree
---
 .../boot/dts/mediatek/mt7981b-openwrt-one.dts      | 77 ++++++++++++++++++++++
 arch/arm64/boot/dts/mediatek/mt7981b.dtsi          |  2 +-
 2 files changed, 78 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts b/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
index 5834273839c17..183e48d985ed7 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
+++ b/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
@@ -3,6 +3,7 @@
 /dts-v1/;

 #include "mt7981b.dtsi"
+#include "dt-bindings/pinctrl/mt65xx.h"

 / {
 	compatible = "openwrt,one", "mediatek,mt7981b";
@@ -53,6 +54,82 @@ mux {
 			groups = "pcie_pereset";
 		};
 	};
+
+	spi2_flash_pins: spi2-pins {
+		mux {
+			function = "spi";
+			groups = "spi2";
+		};
+
+		conf-pu {
+			bias-pull-up = <MTK_PUPD_SET_R1R0_11>;
+			drive-strength = <8>;
+			pins = "SPI2_CS", "SPI2_WP";
+		};
+
+		conf-pd {
+			bias-pull-down = <MTK_PUPD_SET_R1R0_11>;
+			drive-strength = <8>;
+			pins = "SPI2_CLK", "SPI2_MOSI", "SPI2_MISO";
+		};
+	};
+};
+
+&spi2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi2_flash_pins>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				reg = <0x00000 0x40000>;
+				label = "bl2-nor";
+			};
+
+			partition@...00 {
+				reg = <0x40000 0xc0000>;
+				label = "factory";
+				read-only;
+
+				nvmem-layout {
+					compatible = "fixed-layout";
+					#address-cells = <1>;
+					#size-cells = <1>;
+
+					wifi_factory_calibration: eeprom@0 {
+						reg = <0x0 0x1000>;
+					};
+
+					wan_factory_mac: macaddr@24 {
+						reg = <0x24 0x6>;
+						compatible = "mac-base";
+						#nvmem-cell-cells = <1>;
+					};
+				};
+			};
+
+			partition@...000 {
+				reg = <0x100000 0x80000>;
+				label = "fip-nor";
+			};
+
+			partition@...000 {
+				reg = <0x180000 0xc80000>;
+				label = "recovery";
+			};
+		};
+	};
 };

 &uart0 {
diff --git a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
index 3510a26cb5112..2c9819f28fdc2 100644
--- a/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7981b.dtsi
@@ -195,7 +195,7 @@ i2c@...07000 {
 			status = "disabled";
 		};

-		spi@...09000 {
+		spi2: spi@...09000 {
 			compatible = "mediatek,mt7981-spi-ipm", "mediatek,spi-ipm";
 			reg = <0 0x11009000 0 0x1000>;
 			interrupts = <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>;

-- 
2.51.0