[PATCH 4/4] [RFC] ARM: dts: stm32: Switch DWMAC RMII clock to MCO2 on DHCOM

[Marek Vasut]

Using the MCO2 output for the LAN8710i PHY clock and feedback clock
into the DWMAC reduces EMI, switch to MCO2.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Alexandre Torgue <alexandre.torgue at st.com>
Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
Cc: Patrice Chotard <patrice.chotard at st.com>
Cc: Patrick Delaunay <patrick.delaunay at st.com>
Cc: linux-stm32 at st-md-mailman.stormreply.com
To: linux-arm-kernel at lists.infradead.org
---
 arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
index dc70ddd09e9d..ff70bd03a017 100644
--- a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
+++ b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
@@ -110,15 +110,21 @@ &dts {
 	status = "okay";
 };
 
+&clk_eth_rx {
+	clocks = <&rcc CK_MCO2>;
+	assigned-clocks = <&rcc CK_MCO2>;
+	assigned-clock-parents = <&rcc PLL4_P>;
+	assigned-clock-rates = <50000000>;
+};
+
 &ethernet0 {
 	status = "okay";
-	pinctrl-0 = <&ethernet0_rmii_pins_a>;
-	pinctrl-1 = <&ethernet0_rmii_sleep_pins_a>;
+	pinctrl-0 = <&ethernet0_rmii_pins_b &mco2_pins_a>;
+	pinctrl-1 = <&ethernet0_rmii_sleep_pins_b &mco2_sleep_pins_a>;
 	pinctrl-names = "default", "sleep";
 	phy-mode = "rmii";
 	max-speed = <100>;
 	phy-handle = <&phy0>;
-	st,eth-ref-clk-sel;
 	phy-reset-gpios = <&gpioh 3 GPIO_ACTIVE_LOW>;
 
 	mdio0 {
-- 
2.29.2