[PATCH] ARM: dts: stm32: lxa-tac: reduce RGMII interface drive strength

[Uwe Kleine-König]

From: Leonard Göhrs <l.goehrs at pengutronix.de>

This results in an improvement of EMI performance by reducing the
125MHz emission and its harmonics caused by the RGMII clock line.

Signed-off-by: Leonard Göhrs <l.goehrs at pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
index 7e835a7cf64a..cfaf8adde319 100644
--- a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
@@ -471,6 +471,10 @@ switch: switch at 0 {
 		interrupt-parent = <&gpioa>;
 		interrupts = <6 IRQ_TYPE_EDGE_RISING>;
 
+		/* Reduce RGMII EMI emissions by reducing drive strength */
+		microchip,hi-drive-strength-microamp = <2000>;
+		microchip,lo-drive-strength-microamp = <8000>;
+
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
-- 
2.43.0