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

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@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

diff --git a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
index 7e835a7cf64a50b5fe7346b2a4111d14eded0e99..cfaf8adde319fc2bc536a6bc17270d0d074456b8 100644 (file)
--- a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
@@ -471,6 +471,10 @@ baseboard_eeprom: &sip_eeprom {
                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>;