linux-kernel - Re: [PATCH v2 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII CLK drive strength

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Message-ID: <20250919044644.GH9196@nxa18884-linux.ap.freescale.net>
Date: Fri, 19 Sep 2025 12:46:44 +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 v2 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII
 CLK drive strength

On Thu, Sep 18, 2025 at 08:44:48AM -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
>lower emissions. Additionally since TXC is not a high frequency clock,
>use slow slew rate (FSEL=0) for lower emmissions and improved signal
>quality.
>
>Signed-off-by: Tim Harvey <tharvey@...eworks.com>

Reviewed-by: Peng Fan <peng.fan@....com>