From: Leonard Göhrs <l.goehrs@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
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@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
