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Received: from 89-212-21-243.static.t-2.net ([89.212.21.243]:40514 helo=localhost.localdomain) by cp2.siel.si with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.99.2) (envelope-from ) id 1wKs6Y-0000000AGWs-3Wgs; Thu, 07 May 2026 08:21:02 +0200 From: Primoz Fiser To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Frank Li , 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, upstream@lists.phytec.de Subject: [PATCH 2/3] arm64: dts: freescale: imx{91,93}-phycore-som: Adjust PHY RST drive-strength Date: Thu, 7 May 2026 08:20:57 +0200 Message-Id: <20260507062058.1711292-2-primoz.fiser@norik.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260507062058.1711292-1-primoz.fiser@norik.com> References: <20260507062058.1711292-1-primoz.fiser@norik.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cp2.siel.si X-AntiAbuse: Original Domain - lists.infradead.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - norik.com X-Get-Message-Sender-Via: cp2.siel.si: authenticated_id: primoz.fiser@norik.com X-Authenticated-Sender: cp2.siel.si: primoz.fiser@norik.com X-Source: X-Source-Args: X-Source-Dir: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260507_075044_964128_D7D3D763 X-CRM114-Status: UNSURE ( 6.40 ) 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 According to measurements, the PHY reset signal shows an overshoot on the rising edge that exceeds the specified limits (max 2.1V) when using X4 strength on ENET2_RXC. Reduce drive-strength to X1 to decrease the overshoot and bring signal within specification limits. Signed-off-by: Primoz Fiser --- arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi | 2 +- arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi index 19e7e84ad6f7..8038d92da2aa 100644 --- a/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi @@ -220,7 +220,7 @@ MX91_PAD_ENET2_TD0__ENET2_RGMII_TD0 0x50e MX91_PAD_ENET2_TD1__ENET2_RGMII_TD1 0x50e MX91_PAD_ENET2_TX_CTL__ENET2_RGMII_TX_CTL 0x50e MX91_PAD_ENET2_TD2__ENET2_TX_CLK2 0x4000050e - MX91_PAD_ENET2_RXC__GPIO4_IO23 0x51e + MX91_PAD_ENET2_RXC__GPIO4_IO23 0x502 >; }; diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi index 626160132e3c..a624aed48efe 100644 --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi @@ -222,7 +222,7 @@ MX93_PAD_ENET2_TD0__ENET1_RGMII_TD0 0x50e MX93_PAD_ENET2_TD1__ENET1_RGMII_TD1 0x50e MX93_PAD_ENET2_TX_CTL__ENET1_RGMII_TX_CTL 0x50e MX93_PAD_ENET2_TD2__ENET1_TX_CLK 0x4000050e - MX93_PAD_ENET2_RXC__GPIO4_IO23 0x51e + MX93_PAD_ENET2_RXC__GPIO4_IO23 0x502 >; }; -- 2.34.1