Thread (9 messages) 9 messages, 2 authors, 2026-09-01

[net-next,PATCH v2 5/5] arm64: dts: st: increase deassert of PHY reset in stm32mp257f-ev1

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COLD42d REVIEWED: 31 (31M)

From: Christophe Roullier <hidden>
Date: 2026-08-12 09:13:19
Also in: linux-arm-kernel, linux-devicetree, lkml
Subsystem: arm/stm32 architecture, the rest · Maintainers: Maxime Coquelin, Alexandre Torgue, Linus Torvalds

1 review trailer.

The RTL8211F has a PHYRSTB pin to reset the chip.
For a complete PHY reset, this pin must be asserted low for
at least 10ms for the internal regulator.
Wait for at least 80ms (for internal circuits setting time) before
accessing the PHY register.
All registers will return to default values after a hardware reset

Signed-off-by: Christophe Roullier <redacted>
Reviewed-by: Linus Walleij <linusw@kernel.org>
---
 arch/arm64/boot/dts/st/stm32mp257f-ev1.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts b/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
index 14e033f365e39..a41ab55aa8cb5 100644
--- a/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
+++ b/arch/arm64/boot/dts/st/stm32mp257f-ev1.dts
@@ -247,7 +247,7 @@ phy0_eth2: ethernet-phy@1 {
 			compatible = "ethernet-phy-id001c.c916";
 			reg = <1>;
 			reset-assert-us = <10000>;
-			reset-deassert-us = <300>;
+			reset-deassert-us = <80000>;
 			reset-gpios = <&gpiog 6 GPIO_ACTIVE_LOW>;
 		};
 	};
-- 
2.43.0
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