From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A658DCAC5A8 for ; Thu, 18 Sep 2025 15:45:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=31o55f3VkuC8l8T21nAR5d6paqxEzUQw0xt13BBag+w=; b=yWENUpawcXivjUxbphHCMmPQZ+ Vlz8IE9g5252gIx5FKYuDPehs16QOnfL1TLuRvxtbANC5F3yXmICpE3z85HDeELXQGtIJnoACWZgL Kg5tO2LdD3pmSTlQQKC87nb2zrJ2UQucJ+RBy1ZCWdWW9SJqLUHySY+h8/Y6Khi7uifSrcLTnpZKA vU6DCr1wI5uexukrJE+6xQbhO3TSJiwwiIF4MJ53jYFVSzC4CtyhlqnNhNN7dU1uHUDrX1dw7g7UT 9pZP6Hf8FQoVvzI5YN9nmWR/QoJDQLS0GNFVcJTdsDZEH0VnBOdvImWhax/yq2vaNQUjP2wn5bSlR 3pdTV8vQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uzGos-00000000THO-04rQ; Thu, 18 Sep 2025 15:45:14 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uzGop-00000000TE8-108e for linux-arm-kernel@bombadil.infradead.org; Thu, 18 Sep 2025 15:45:11 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=31o55f3VkuC8l8T21nAR5d6paqxEzUQw0xt13BBag+w=; b=hwpEaNRtjpJZEqYDg/NzAvJrx7 4L4scAyxqtk5+WfRo1kTPba3xaQD7fj4tnfAU4qcMxXAYZebZz2ta1kM10oTizGgqN2vZSq3S+wX8 CrPVrNUqu/7Iq+2BueqIKVVnvLZnjQqa962+YkOgzesHMAiBt1v6mcKworWrAQ7qkKgXPwlzXOEXc KWU9HFmNLNHlsfEMU7QUuBaCWY4zmxhsZOpMfILtovW6tFCyKFQMhnQ9o5rk2e4gdmAQg4WttpNxp niPOJv32a3hG15u9qpsHEUAV5RnWOItJ7DmYRG46NVdgVCoJ2wVHZk6WClZIV9Km56zT1P2qJtt5+ OAes/QEg==; Received: from finn.gateworks.com ([108.161.129.64] helo=finn.localdomain) by desiato.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uzGol-00000007dnM-1qSU for linux-arm-kernel@lists.infradead.org; Thu, 18 Sep 2025 15:45:09 +0000 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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250918_164507_589979_D581D567 X-CRM114-Status: UNSURE ( 9.07 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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=0) for lower emmissions and improved signal quality. Signed-off-by: Tim Harvey --- 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 >; }; -- 2.25.1