From patchwork Wed Apr 6 13:05:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tudor Ambarus X-Patchwork-Id: 12803355 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 1CBDBC433F5 for ; Wed, 6 Apr 2022 13:06:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=18pEkCliAHe21kOQQhCbaIDZfTxGCkLIUGPyyeux2w8=; b=mYMijKX4hbETBJ bs2pFJMUpqmjAn+RYa2kwiFw8XhfzHwYpi1CBTJ7lhqlCsMnWgTvWL4sievv+mvuuwP1ribbapuz0 dLiYuNE0VpdLU7RRL60x3AWqFqH7xSEms/wphx87IV+iajGzlYDTrRMa7Aqrl5v1vUPwXx58LVpOf 1l2HpR1pheJbR4tWOmdiweln1WxHG7LAmanDqLxU2ARQrQO9E3xmuJlDJ83Z0PfBa0Cq6K03EVjIX UZwRJF7SxvV8/vQn/eBGX0ZiXRWzYyDLEwm2tAPZYh4AoW17fAiwAFbw6v6Os1Es4goT/ew8K2JlI 6RelA7pPztZBLRGa1Xcg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nc5LY-006BWi-Jc; Wed, 06 Apr 2022 13:05:16 +0000 Received: from esa.microchip.iphmx.com ([68.232.154.123]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nc5LU-006BUA-Bw for linux-arm-kernel@lists.infradead.org; Wed, 06 Apr 2022 13:05:14 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1649250312; x=1680786312; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=zjf7X0lVKs4SoEyMp3osHnKJa+EJjosbh+q7mblHMAE=; b=kZXl+eVew6KFlfgt+2o5VrAN4oxdtjPFu+O+9Sz87G8bK4ly0UUZRpYZ 1MG04ivbjTnpQpa/SEGkFDAH88nVJBk+C8cZkc69V/b+kruAFstpwUBv/ UgWn/4p9AVH2HwQ3r0uKWT8bDeWD0F8xOAHEoR0crISN0Oevs8JZAEUHj 4ZpoV1zl2UmkoRh32xuXuYdMyskUb8+G8wc9R7BQcnoB15U3OXRZG6xV5 SyX3PXTI/fA6CPpOe/OyzZQf7/rOA1UZJZukdm+V0PIgwrEtTQ5qQEYaY PIhi7dwvKpkOojH5iz4XbffxxMBEpa9E2A37ZIO+txvklYGYBMCEEqz8v A==; 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220406_060512_546184_9BCBF62E X-CRM114-Status: GOOD ( 10.36 ) 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 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 Reviewed-by: Claudiu Beznea Acked-by: Nicolas Ferre Acked-by: Nicolas Ferre --- 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 {