From nobody Thu Oct 2 10:55:23 2025 Received: from finn.localdomain (finn.gateworks.com [108.161.129.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B764B313291; Thu, 18 Sep 2025 15:45:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=108.161.129.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758210308; cv=none; b=orU4B0UuQ+MTOZRAQC5DJXS10VhUqKsH4UswFfX/yHa+qKtUMF/CIDxZeimNA0u8L8S4gJzFuRQ75cZ8Vf7KDsCpj0NfQ5Yslbg1nNPh8SsMoXLNFxKeFOt0TXdyN70L8nD2hZHZ99tO6I4QT3xK1rY4PCAJdlDhtRziNYdi16w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758210308; c=relaxed/simple; bh=vsAmNFxLbdkNTlMLmwyaXIICvEbVQlM3xrmAQAQ+h6I=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=h3ssvJUKHmva5UwsT7YAhT+ieCEmeZuSwQUueEjJ2qKn2zDILDKNe0aJ9xIzoAZGQT4vOinFH/5o4OiOwBRXUixojnmH7rXLdlBSQxTxA+8WcRr5C98BIQa12jM+bB2NzLUWANfD0+cm+phTaqw52FatoQwKz5sh2iadMcLFHCI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gateworks.com; spf=pass smtp.mailfrom=gateworks.com; arc=none smtp.client-ip=108.161.129.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gateworks.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gateworks.com Received: from syn-068-189-091-139.biz.spectrum.com ([68.189.91.139] helo=tharvey.pdc.gateworks.com) by finn.localdomain with esmtp (Exim 4.95) (envelope-from ) id 1uzGoZ-00B1eF-UP; Thu, 18 Sep 2025 15:44:56 +0000 From: Tim Harvey To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Tim Harvey Subject: [PATCH v2 3/7] arm64: dts: imx8mp-venice-gw702x: reduce RGMII CLK drive strength Date: Thu, 18 Sep 2025 08:44:47 -0700 Message-Id: <20250918154451.2531802-4-tharvey@gateworks.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250918154451.2531802-1-tharvey@gateworks.com> References: <20250918154451.2531802-1-tharvey@gateworks.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The i.MX8M Plus EQOS 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=3D0) for lower emmissions and improved signal quality. Signed-off-by: Tim Harvey Reviewed-by: Peng Fan --- v2: add FSEL detail to log (Peng) --- arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi b/arch= /arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi index a1232a4f8485..dd9eeb3479fd 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mp-venice-gw702x.dtsi @@ -462,7 +462,7 @@ MX8MP_IOMUXC_ENET_TD1__ENET_QOS_RGMII_TD1 0x16 MX8MP_IOMUXC_ENET_TD2__ENET_QOS_RGMII_TD2 0x16 MX8MP_IOMUXC_ENET_TD3__ENET_QOS_RGMII_TD3 0x16 MX8MP_IOMUXC_ENET_TX_CTL__ENET_QOS_RGMII_TX_CTL 0x16 - MX8MP_IOMUXC_ENET_TXC__CCM_ENET_QOS_CLOCK_GENERATE_TX_CLK 0x16 + MX8MP_IOMUXC_ENET_TXC__CCM_ENET_QOS_CLOCK_GENERATE_TX_CLK 0x0 >; }; =20 --=20 2.25.1