The SPI NOR chip is connected on the FSPI0 core, so enable the sfc0 node
and add the flash device to it.

The SPI NOR won't work at higher speed than 50 MHz, specify the limit.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
---
 arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
index 5dc1c18a3b211..09977dc191fe1 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-rock-4d.dts
@@ -670,6 +670,22 @@ &sdmmc {
 	status = "okay";
 };
 
+
+&sfc0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&fspi0_pins &fspi0_csn0>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <50000000>;
+		spi-rx-bus-width = <4>;
+		spi-tx-bus-width = <1>;
+		vcc-supply = <&vcc_1v8_s3>;
+	};
+};
+
 &u2phy0 {
 	status = "okay";
 };
-- 
2.48.1