diff --git a/boards/sensry/ganymed_bob/ganymed_bob_sy120-pinctrl.dtsi b/boards/sensry/ganymed_bob/ganymed_bob_sy120-pinctrl.dtsi
index 97649fe985f..45b41f9ede3 100644
--- a/boards/sensry/ganymed_bob/ganymed_bob_sy120-pinctrl.dtsi
+++ b/boards/sensry/ganymed_bob/ganymed_bob_sy120-pinctrl.dtsi
@@ -114,26 +114,32 @@
 
 	/omit-if-no-ref/ rgmii_tx_ctl: rgmii_tx_ctl {
 		pinmux = <SY1XX_RGMII0_PAD_CFG0 SY1XX_PAD(2)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_tx_clk: rgmii_tx_clk {
 		pinmux = <SY1XX_RGMII0_PAD_CFG0 SY1XX_PAD(3)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd0: rgmii_txd0 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(0)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd1: rgmii_txd1 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(1)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd2: rgmii_txd2 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(2)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd3: rgmii_txd3 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(3)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_rxd0: rgmii_rxd0 {
diff --git a/boards/sensry/ganymed_sk/ganymed_sk_sy120-pinctrl.dtsi b/boards/sensry/ganymed_sk/ganymed_sk_sy120-pinctrl.dtsi
index 09a8fa16f88..efed873377c 100644
--- a/boards/sensry/ganymed_sk/ganymed_sk_sy120-pinctrl.dtsi
+++ b/boards/sensry/ganymed_sk/ganymed_sk_sy120-pinctrl.dtsi
@@ -114,26 +114,32 @@
 
 	/omit-if-no-ref/ rgmii_tx_ctl: rgmii_tx_ctl {
 		pinmux = <SY1XX_RGMII0_PAD_CFG0 SY1XX_PAD(2)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_tx_clk: rgmii_tx_clk {
 		pinmux = <SY1XX_RGMII0_PAD_CFG0 SY1XX_PAD(3)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd0: rgmii_txd0 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(0)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd1: rgmii_txd1 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(1)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd2: rgmii_txd2 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(2)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_txd3: rgmii_txd3 {
 		pinmux = <SY1XX_RGMII0_PAD_CFG1 SY1XX_PAD(3)>;
+		slew-rate = <3>;
 	};
 
 	/omit-if-no-ref/ rgmii_rxd0: rgmii_rxd0 {