[PATCH] ARM: dts: stm32: Disable LAN8710 EDPD on DHCOM

[Marek Vasut]

The LAN8710 Energy Detect Power Down (EDPD) functionality might cause
unreliable cable detection. There are multiple accounts of this in the
SMSC PHY driver patches which attempted to make EDPD reliable, however
it seems there is always some sort of corner case left. Unfortunatelly,
there is no errata documented which would confirm this to be a silicon
bug on the LAN87xx series of PHYs (LAN8700, LAN8710, LAN8720 at least).

Disable EDPD on the DHCOM SoM, just like multiple other boards already
do as well, to make the cable detection reliable.

Fixes: 34e0c7847dcf ("ARM: dts: stm32: Add DH Electronics DHCOM STM32MP1 SoM and PDK2 board")
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
Cc: Patrice Chotard <patrice.chotard at foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay at foss.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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
index 8349c9099e301..8c41f819f7769 100644
--- a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
+++ b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
@@ -140,6 +140,7 @@ phy0: ethernet-phy at 1 {
 			reset-gpios = <&gpioh 3 GPIO_ACTIVE_LOW>;
 			reset-assert-us = <500>;
 			reset-deassert-us = <500>;
+			smsc,disable-energy-detect;
 			interrupt-parent = <&gpioi>;
 			interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
 		};
-- 
2.30.2