From nobody Fri Jun 19 07:18:08 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87CFFC433F5 for ; Wed, 6 Apr 2022 15:46:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236653AbiDFPse (ORCPT ); Wed, 6 Apr 2022 11:48:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236881AbiDFPrv (ORCPT ); Wed, 6 Apr 2022 11:47:51 -0400 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A1CB03B6647; Wed, 6 Apr 2022 06:05:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1649250311; x=1680786311; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=zjf7X0lVKs4SoEyMp3osHnKJa+EJjosbh+q7mblHMAE=; b=DAn5I6sNtpKkbG9r/NAjWptVjxqPznJQk2IGaRuOx8XyCAAxwVml7NnM ySqWn8fcWul+ESpIyYStfmXsRc9RMWOIsxl+fqMG+xqSKMLkvgulQxBKB V8bgX9JZmaemRRrzWEhZOFTWWdoWe8+mLYxh4C/6KF/OUryHm3isx+zjT xt+4J3jbdzUO9N+Tsszc7cppVWse9wjOiNSbGm04RZzphMp+gav2sKAWI SZfteNR/au4Bhy8MjD1VKB0iAd/HuxZc5aqjJuDwmF7kfbxNFQcYsQXzE KuV3iIyFpgXn3Y4wvjyNZgb4XfCUlahaB/Heh3gK+9Hl8pMCdtBb2q1iy g==; X-IronPort-AV: E=Sophos;i="5.90,239,1643698800"; d="scan'208";a="151730482" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa4.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 06 Apr 2022 06:05:10 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Wed, 6 Apr 2022 06:05:09 -0700 Received: from ROB-ULT-M18064N.mchp-main.com (10.10.115.15) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server id 15.1.2375.17 via Frontend Transport; Wed, 6 Apr 2022 06:05:06 -0700 From: Tudor Ambarus To: , CC: , , , , "Tudor Ambarus" , Mihai Sain Subject: [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines Date: Wed, 6 Apr 2022 16:05:05 +0300 Message-ID: <20220406130505.422042-1-tudor.ambarus@microchip.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The impedance of the QSPI PCB lines on the sama7g5ek is 50 Ohms. Align the output impedance of the QSPI0 HSIOs by setting a medium drive strength which corresponds to an impedance of 56 Ohms when VDD is in the 3.0V - 3.6V range. The high drive strength setting corresponds to an output impedance of 42 Ohms on the QSPI0 HSIOs. Suggested-by: Mihai Sain Signed-off-by: Tudor Ambarus Acked-by: Nicolas Ferre Reviewed-by: Claudiu Beznea --- arch/arm/boot/dts/at91-sama7g5ek.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/at91-sama7g5ek.dts b/arch/arm/boot/dts/at91-= sama7g5ek.dts index 08685a10eda1..8f9643170ba3 100644 --- a/arch/arm/boot/dts/at91-sama7g5ek.dts +++ b/arch/arm/boot/dts/at91-sama7g5ek.dts @@ -655,7 +655,7 @@ pinctrl_qspi: qspi { ; bias-disable; slew-rate =3D <0>; - atmel,drive-strength =3D ; + atmel,drive-strength =3D ; }; =20 pinctrl_sdmmc0_default: sdmmc0_default { --=20 2.25.1