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 X-Spam-Level: * X-Spam-Status: No, score=1.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_HIGH, UNWANTED_LANGUAGE_BODY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 257DCC4321D for ; Wed, 15 Aug 2018 15:09:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 37D13208B1 for ; Wed, 15 Aug 2018 15:09:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="R40kkhKJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 37D13208B1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730626AbeHOSA6 (ORCPT ); Wed, 15 Aug 2018 14:00:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:50842 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730492AbeHOSA6 (ORCPT ); Wed, 15 Aug 2018 14:00:58 -0400 Received: from [192.168.1.25] (cpe-70-114-128-244.austin.res.rr.com [70.114.128.244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3E99420C09; Wed, 15 Aug 2018 15:08:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1534345705; bh=87z3EyxDLAfToEQG3Hm9/7tG6pxrC5f5goCjVS1KOWQ=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=R40kkhKJgwduKU+/lyyoFxzn2K0ypajD4FrfwgxITfEt8Z9bv+Au0TeCGLGjp9Ec+ rOWMCZXxIh/taeW3U9Fz606O8kBpOLcqzfFD1K4FpiEJVZhB5M1rnvpO33W4uJtH8R JLifCNOBibfhz2EAaIoZqrBXloirU+rEk2FzqiZA= Subject: Re: [PATCH] arm64: dts: stratix10: i2c clock running out of spec To: Alan Tull , Rob Herring , Mark Rutland , Catalin Marinas , Will Deacon Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20180808154241.3760-1-atull@kernel.org> From: Dinh Nguyen Openpgp: preference=signencrypt Autocrypt: addr=dinguyen@kernel.org; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180808154241.3760-1-atull@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/08/2018 10:42 AM, Alan Tull wrote: > DesignWare I2C controller was observed running at 105.93kHz rather > than the specified 100kHz. Adjust device tree settings to bring it > within spec (a slightly conservative 98 MHz). > > Signed-off-by: Alan Tull > --- > arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts > index 6edc4fa..53cf195 100644 > --- a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts > +++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts > @@ -124,6 +124,8 @@ > &i2c1 { > status = "okay"; > clock-frequency = <100000>; > + i2c-sda-falling-time-ns = <890>; /* hcnt */ > + i2c-sdl-falling-time-ns = <890>; /* lcnt */ > > adc@14 { > compatible = "lltc,ltc2497"; > Applied! Thanks, Dinh