From patchwork Wed Apr 4 19:45:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Austin Christ X-Patchwork-Id: 10323311 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 43DDC60390 for ; Wed, 4 Apr 2018 19:45:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 34D2F28FA4 for ; Wed, 4 Apr 2018 19:45:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 29A8128FA6; Wed, 4 Apr 2018 19:45:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C798528FA4 for ; Wed, 4 Apr 2018 19:45:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751807AbeDDTpT (ORCPT ); Wed, 4 Apr 2018 15:45:19 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:55922 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751780AbeDDTpQ (ORCPT ); Wed, 4 Apr 2018 15:45:16 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 87A5C60F61; Wed, 4 Apr 2018 19:45:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1522871115; bh=IhWv/xLGEmT85IZi9q9izzApak4uyWSzNxJcoB7lGng=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dqxM2cBihZOU3rAgmT+siNCknvLQ8iEPZFbtMSESgnuNGK08j2eeTiaKJPQizddvQ W3UpE3l+dFF6NwSHPhWmdTfhErIMchc/WKNPTgUzkG5ybv6H60nAUEObDV18ro8Cu+ Sedqm5jD2wyX9qLdLBIdN3HLUdYyhYcPd/mKWfBA= Received: from austinwc-lnx.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: austinwc@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 5B86160F6E; Wed, 4 Apr 2018 19:45:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1522871114; bh=IhWv/xLGEmT85IZi9q9izzApak4uyWSzNxJcoB7lGng=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JL1e4VzSmHANhqsbVJHvKyRgYy7wxhx8r1b4f+zIkJ7/YnmTq6hiHNsaABD+bmigv 5b/UIuWubDt0s2Mn3RKWvWv0oBGRQo7toIa/kGOvHDJMjYWYBgc+/Tiezf6QjkBNEt Y0eJXUXToxtuo//fSQZ77RK+QLKtlsrL5zO/9Z34= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 5B86160F6E Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=austinwc@codeaurora.org From: Austin Christ To: wsa@the-dreams.de, linux-i2c@vger.kernel.org, linux-arm-msm@vger.kernel.org Cc: rruigrok@codeaurora.org, timur@codeaurora.org, Austin Christ Subject: [PATCH 4/4] i2c: qup: Add command-line parameter to override SCL frequency Date: Wed, 4 Apr 2018 13:45:00 -0600 Message-Id: <1522871100-3621-5-git-send-email-austinwc@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1522871100-3621-1-git-send-email-austinwc@codeaurora.org> References: <1522871100-3621-1-git-send-email-austinwc@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a module parameter to override SCL frequency provided by firmware. This can be useful when testing spec compliance for I2C modes or when debugging issues across multiple operating frequencies. Signed-off-by: Austin Christ --- drivers/i2c/busses/i2c-qup.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index 2a88611..a20b446 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -155,6 +155,10 @@ /* TAG length for DATA READ in RX FIFO */ #define READ_RX_TAGS_LEN 2 +static unsigned int scl_freq; +module_param_named(scl_freq, scl_freq, uint, 0444); +MODULE_PARM_DESC(scl_freq, "SCL frequency override"); + /* * count: no of blocks * pos: current block number @@ -1682,10 +1686,15 @@ static int qup_i2c_probe(struct platform_device *pdev) init_completion(&qup->xfer); platform_set_drvdata(pdev, qup); - ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq); - if (ret) { - dev_notice(qup->dev, "using default clock-frequency %d", - DEFAULT_CLK_FREQ); + if (scl_freq) { + dev_notice(qup->dev, "Using override frequency of %u\n", scl_freq); + clk_freq = scl_freq; + } else { + ret = device_property_read_u32(qup->dev, "clock-frequency", &clk_freq); + if (ret) { + dev_notice(qup->dev, "using default clock-frequency %d", + DEFAULT_CLK_FREQ); + } } if (acpi_match_device(qup_i2c_acpi_match, qup->dev)) {