diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 0a2df0195378fe..4de0b6fbcb504b 100644
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -188,7 +188,7 @@ Load:   dtoverlay=at86rf233,<param>=<val>
 Params: interrupt               GPIO used for INT (default 23)
         reset                   GPIO used for Reset (default 24)
         sleep                   GPIO used for Sleep (default 25)
-        speed                   SPI bus speed in Hz (default 6000000)
+        speed                   SPI bus speed in Hz (default 3000000)
         trim                    Fine tuning of the internal capacitance
                                 arrays (0=+0pF, 15=+4.5pF, default 15)
 
diff --git a/arch/arm/boot/dts/overlays/at86rf233-overlay.dts b/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
index 0460269cd6d1c0..eab40523b78f20 100644
--- a/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
+++ b/arch/arm/boot/dts/overlays/at86rf233-overlay.dts
@@ -25,7 +25,7 @@
 				interrupts = <23 4>; /* active high */
 				reset-gpio = <&gpio 24 1>;
 				sleep-gpio = <&gpio 25 1>;
-				spi-max-frequency = <6000000>;
+				spi-max-frequency = <3000000>;
 				xtal-trim = /bits/ 8 <0xf>;
 			};
 		};