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 716EECA1013 for ; Thu, 18 Sep 2025 15:45:20 +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=Z17c0Z6gdvcqsoZbJLjmb3Fjyl+nR7eyCn4ibpLPBn0=; b=33nxf+ze21F+hlOcknRhomKldA 723MRJwoUICmZCdS4VjMhLxxkzy0+bigKFDR1mYBTRPF/47Xxrm9X9pCMq9Tv8ETMQZyGr9ee5WFr H+GTxQiRjEcmHmTPlvG6IZtVEzoSBDNyKcukQ5x81LaCSazlA+1Dso8iLCozTARbuToNcpnUIDRaR FR2zl1ectP97ACk+n030pEMLDr6XyF1f7DlDabmROyueiGVFMPD2MOnUZpXob4emF0tShjYUzdoLJ GfycTtK60RPflZWA3nQGGW01udgAKD3Z/u1zILRiZ1ZspLrrjTV3NtFHedd94BC+JYh7mMCQ4uDbv lhEfh5Tw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uzGos-00000000THx-1Skf; 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-00000000TE6-1Msy 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=Z17c0Z6gdvcqsoZbJLjmb3Fjyl+nR7eyCn4ibpLPBn0=; b=Nf2/1UP+XIGMJBRahiVU6lI3vX OnVSD9BW0+yi+AiZ74nQ0UvxxvwSvBGsLXX80PKhjdVEk/wCBegyrYI6tca1thPES0YCtsYBK0Y+8 UBqbuUHF1K4dXoLj+yJIXNEb1sR4mSlQlukjwsw0SY3Cw/UPK1bmoDaZcwcNZ3RiQBZZTbrbZgbQy P9Nf0ijipzEdOcFlWmL5KmP/eWmzVAa6nc2lWNOPHCHkdp02cF0OXJeow4Wlk/V+uzlla2Gr/B5kX 7jMEZLwpSYbrPGznDLmC9/8s/wy/FjMBOQ79dTkWxSojbXSB4CxgBYwuIE/xPIbh1XmqJdnGnhYbS fxsvuGAg==; 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 1uzGok-00000007dnC-49Uv 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 1uzGoa-00B1eF-QM; 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 4/7] arm64: dts: imx8mm-venice-gw700x: reduce RGMII CLK drive strength Date: Thu, 18 Sep 2025 08:44:48 -0700 Message-Id: <20250918154451.2531802-5-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_139472_D4FA5EBF X-CRM114-Status: UNSURE ( 9.06 ) 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 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 --- v2: add FSEL detail to log (Peng) --- 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 MX8MM_IOMUXC_ENET_RXC_ENET1_RGMII_RXC 0x91 MX8MM_IOMUXC_ENET_RX_CTL_ENET1_RGMII_RX_CTL 0x91 MX8MM_IOMUXC_ENET_TX_CTL_ENET1_RGMII_TX_CTL 0x1f -- 2.25.1