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

Sjoerd Simons
2025-11-01T13:33:25Z

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@collabora.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@40000 {
+ 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@100000 {
+ reg = <0x100000 0x80000>;
+ label = "fip-nor";
+ };
+
+ partition@180000 {
+ 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@11007000 {
status = "disabled";
};

- spi@11009000 {
+ spi2: spi@11009000 {
compatible = "mediatek,mt7981-spi-ipm", "mediatek,spi-ipm";
reg = <0 0x11009000 0 0x1000>;
interrupts = <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>;

--
2.51.0