linux-kernel - Re: [PATCH 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII CLK drive strength

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Message-ID: <20250918091132.GD23028@nxa18884-linux.ap.freescale.net>
Date: Thu, 18 Sep 2025 17:11:32 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Tim Harvey <tharvey@...eworks.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII CLK
 drive strength

On Tue, Sep 16, 2025 at 08:32:13AM -0700, Tim Harvey wrote:
>The i.MX8M Mini FEC RGMII tracelength is less than 1in and does not
>require a x6 drive strength. Reduce the CLK drive strength to x1 for
>better emissions.
>
>Signed-off-by: Tim Harvey <tharvey@...eworks.com>
>---
> arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
>index baf46fe28133..dca213c85cc3 100644
>--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
>+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw700x.dtsi
>@@ -446,7 +446,7 @@ MX8MM_IOMUXC_ENET_RD3_ENET1_RGMII_RD3		0x91
> 			MX8MM_IOMUXC_ENET_RD2_ENET1_RGMII_RD2		0x91
> 			MX8MM_IOMUXC_ENET_RD1_ENET1_RGMII_RD1		0x91
> 			MX8MM_IOMUXC_ENET_RD0_ENET1_RGMII_RD0		0x91
>-			MX8MM_IOMUXC_ENET_TXC_ENET1_RGMII_TXC		0x1f
>+			MX8MM_IOMUXC_ENET_TXC_ENET1_RGMII_TXC		0x0

Same as comment in patch 3

Thanks,
Peng