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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E569C433F5 for ; Wed, 13 Apr 2022 12:41:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235589AbiDMMn1 (ORCPT ); Wed, 13 Apr 2022 08:43:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233118AbiDMMn0 (ORCPT ); Wed, 13 Apr 2022 08:43:26 -0400 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.153.233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 949801D0D3; Wed, 13 Apr 2022 05:41:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1649853661; x=1681389661; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=ebMpJGGb5gMCwHAMeqEodjyAC5Xzs4wopUvYXPdNTQ8=; b=MKO+u/3gFr+i33VGC23EJTDZVDMQ2kur4tNdtkLi/tdh0oUj0oIHLBVQ HBipATd3v1EobsnDRNYDzXKC8hwGyXqjpVAcp23Dj3bgoLWor614zw3j8 QrpiGVm543PE+d3nYM3zvCzHBlApyQI8DK+hTtWkiPZyk/R+c6nIAJCTf s3k6m9VRCNnTgOB72BAwG45xIL447O0ewk7Nc7OM2QBCfebzZFRfTUUwL I0NN+Y3rNA0l6f1AIDiBsLf3Bow2wmrjqYoZJozLCN+BIdbjPLW3DzSBU IueTDe8AcZ6uJ9/1fkXgQL3YRzeWW6Wa6Xk/fseIqpA7D0coRiav7QsW6 g==; X-IronPort-AV: E=Sophos;i="5.90,256,1643698800"; d="scan'208";a="160393691" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa3.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 13 Apr 2022 05:40:54 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Wed, 13 Apr 2022 05:40:51 -0700 Received: from [10.12.72.146] (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, 13 Apr 2022 05:40:50 -0700 Message-ID: <732474b0-12e4-8dc2-d957-d71aeb40e966@microchip.com> Date: Wed, 13 Apr 2022 14:40:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH] ARM: dts: at91: sama7g5ek: Align the impedance of the QSPI0's HSIO and PCB lines Content-Language: en-US To: Tudor Ambarus , CC: , , , , "Mihai Sain" References: <20220406130505.422042-1-tudor.ambarus@microchip.com> From: Nicolas Ferre Organization: microchip In-Reply-To: <20220406130505.422042-1-tudor.ambarus@microchip.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 06/04/2022 at 15:05, Tudor Ambarus wrote: > 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 And queued in "fixes" branch for 5.18. Thanks, best regards, Nicolas > --- > 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 = <0>; > - atmel,drive-strength = ; > + atmel,drive-strength = ; > }; > > pinctrl_sdmmc0_default: sdmmc0_default { -- Nicolas Ferre