linux-kernel - [PATCH 1/2] arm64: dts: imx8mm-evk: add phy-reset-gpios for fec1

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Message-Id: <20200214192750.20845-1-alifer.wsdm@gmail.com>
Date:   Fri, 14 Feb 2020 16:27:49 -0300
From:   Alifer Moraes <alifer.wsdm@...il.com>
To:     robh+dt@...nel.org
Cc:     mark.rutland@....com, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        peng.fan@....com, leonard.crestez@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alifer Moraes <alifer.wsdm@...il.com>
Subject: [PATCH 1/2] arm64: dts: imx8mm-evk: add phy-reset-gpios for fec1

imx8mm-evk has a GPIO connected to AR8031 Ethernet PHY's reset pin.

Describe it in the device tree, following phy's datasheet reset duration of 10ms.

Tested booting via NFS.

Signed-off-by: Alifer Moraes <alifer.wsdm@...il.com>
---

Originally sent by Peng Fan <peng.fan@....com>

Back then CONFIG_AT803X_PHY was set as "m" in defconfig so the boot process hung
at nfs boot, now that CONFIG_AT803X_PHY is set as "y" by default, the patch works
correctly.

Peng's original patch missed to pass the phy-reset-duration, according to the AR8031
datasheet the reset GPIO needs to stay low for 10ms.

Original thread: https://lkml.org/lkml/2019/10/21/347

 arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
index 28ab17a277bb..11903ca86f0e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
@@ -82,6 +82,8 @@
 	pinctrl-0 = <&pinctrl_fec1>;
 	phy-mode = "rgmii-id";
 	phy-handle = <&ethphy0>;
+	phy-reset-gpios = <&gpio4 22 GPIO_ACTIVE_LOW>;
+	phy-reset-duration = <10>;
 	fsl,magic-packet;
 	status = "okay";
 
-- 
2.17.1