linux-kernel - [PATCH] imx8mn-var-som: dts: fix PHY detection bug by adding deassert delay

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Message-Id: <20230427195538.2718661-1-hugo@hugovil.com>
Date:   Thu, 27 Apr 2023 15:55:38 -0400
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     Hugo Villeneuve <hvilleneuve@...onoff.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] imx8mn-var-som: dts: fix PHY detection bug by adding deassert delay

From: Hugo Villeneuve <hvilleneuve@...onoff.com>

While testing the ethernet interface on a symphony carrier
board using an imx8mn SOM with an onboard PHY (EC hardware
configuration), the ethernet PHY is not detected.

The device tree in Variscite custom linux git repository uses the
following property:

    phy-reset-post-delay = <20>;

Add a new property 'reset-deassert-us' of 20ms to have the same delay
inside the ethphy phandle.

Adding this property fixes the problem with the PHY detection.

Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
---
 arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
index 67072e6c77d5..9052b0d4b5b4 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
@@ -103,6 +103,7 @@ ethphy: ethernet-phy@4 {
 			reg = <4>;
 			reset-gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
 			reset-assert-us = <10000>;
+			reset-deassert-us = <20000>;
 		};
 	};
 };
-- 
2.30.2