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=-3.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT 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 2EE26C46470 for ; Wed, 8 Aug 2018 15:42:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DBD0721772 for ; Wed, 8 Aug 2018 15:42:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="AabjQK2U" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DBD0721772 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 S1727602AbeHHSC7 (ORCPT ); Wed, 8 Aug 2018 14:02:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:33742 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727081AbeHHSC7 (ORCPT ); Wed, 8 Aug 2018 14:02:59 -0400 Received: from localhost.localdomain (user-0ccsrjt.cable.mindspring.com [24.206.110.125]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 409D821765; Wed, 8 Aug 2018 15:42:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1533742966; bh=x4HpyP6A2oo/rNzLC/EYx2jn1KWMCAsTBzHcosQKYpU=; h=From:To:Cc:Subject:Date:From; b=AabjQK2U/EQ7xVboKhylMPDSqcnq8GbidmUWXhE041EqHGhbOzGO7cGvj8axmsFuV An8OxUgyXxgoRnRi0wRRyogfxxP4zUX+TLNPu0hHLeBuXf68b5jXoCAvxoC5q37Z11 1wnRYJPEsO4qWTl5y8YL5jb7/02/IhPaS2emhm1E= From: Alan Tull To: Dinh Nguyen , Rob Herring , Mark Rutland , Catalin Marinas , Will Deacon Cc: Alan Tull , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] arm64: dts: stratix10: i2c clock running out of spec Date: Wed, 8 Aug 2018 10:42:41 -0500 Message-Id: <20180808154241.3760-1-atull@kernel.org> X-Mailer: git-send-email 2.16.2 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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"; -- 2.7.4