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Wed, 14 Feb 2024 14:05:27 +0100 (CET) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 3F07240044; Wed, 14 Feb 2024 14:05:23 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id CE3A826C6C2; Wed, 14 Feb 2024 14:04:42 +0100 (CET) Received: from [10.201.21.122] (10.201.21.122) by SHFDAG1NODE1.st.com (10.75.129.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Wed, 14 Feb 2024 14:04:42 +0100 Message-ID: Date: Wed, 14 Feb 2024 14:04:41 +0100 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] ARM: dts: stm32: lxa-tac: reduce RGMII interface drive strength Content-Language: en-US To: =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin CC: =?UTF-8?Q?Leonard_G=C3=B6hrs?= , , , , References: <20240129114649.2458468-2-u.kleine-koenig@pengutronix.de> From: Alexandre TORGUE In-Reply-To: <20240129114649.2458468-2-u.kleine-koenig@pengutronix.de> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: EQNCAS1NODE4.st.com (10.75.129.82) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-14_06,2024-02-14_01,2023-05-22_02 Hi On 1/29/24 12:46, Uwe Kleine-König wrote: > From: Leonard Göhrs > > This results in an improvement of EMI performance by reducing the > 125MHz emission and its harmonics caused by the RGMII clock line. > > Signed-off-by: Leonard Göhrs > Signed-off-by: Uwe Kleine-König > --- > arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi > index 7e835a7cf64a..cfaf8adde319 100644 > --- a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi > +++ b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi > @@ -471,6 +471,10 @@ switch: switch@0 { > interrupt-parent = <&gpioa>; > interrupts = <6 IRQ_TYPE_EDGE_RISING>; > > + /* Reduce RGMII EMI emissions by reducing drive strength */ > + microchip,hi-drive-strength-microamp = <2000>; > + microchip,lo-drive-strength-microamp = <8000>; > + > ports { > #address-cells = <1>; > #size-cells = <0>; Applied on stm32-next. Thanks Alex