The Orangepi 4A has a SPI-NOR flash connected to spi0 on the PC pins.
The HOLD and WP pins are not connected, and are instead pulled up by the
supply rail.

Enable spi0 and add a device node for the SPI-NOR flash.

Signed-off-by: Chen-Yu Tsai <wens@kernel.org>
---
 .../dts/allwinner/sun55i-t527-orangepi-4a.dts     | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts b/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
index 9e6b21cf293e..055be86e5fae 100644
--- a/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
+++ b/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
@@ -400,6 +400,21 @@ &rtc {
 	assigned-clock-rates = <32768>;
 };
 
+&spi0  {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_pc_pins>, <&spi0_cs0_pc_pin>;
+	status = "okay";
+
+	flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <20000000>;
+		vcc-supply = <&reg_cldo1>;
+	};
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_pb_pins>;
-- 
2.47.3

Dne nedelja, 21. december 2025 ob 12:05:11 Srednjeevropski standardni čas je Chen-Yu Tsai napisal(a):
> The Orangepi 4A has a SPI-NOR flash connected to spi0 on the PC pins.
> The HOLD and WP pins are not connected, and are instead pulled up by the
> supply rail.
> 
> Enable spi0 and add a device node for the SPI-NOR flash.
> 
> Signed-off-by: Chen-Yu Tsai <wens@kernel.org>

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej