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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 16EE8C2BA19 for ; Wed, 22 Apr 2020 02:57:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EA10020722 for ; Wed, 22 Apr 2020 02:57:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726562AbgDVC5y (ORCPT ); Tue, 21 Apr 2020 22:57:54 -0400 Received: from alexa-out-sd-01.qualcomm.com ([199.106.114.38]:9490 "EHLO alexa-out-sd-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726470AbgDVC53 (ORCPT ); Tue, 21 Apr 2020 22:57:29 -0400 Received: from unknown (HELO ironmsg05-sd.qualcomm.com) ([10.53.140.145]) by alexa-out-sd-01.qualcomm.com with ESMTP; 21 Apr 2020 19:57:27 -0700 Received: from gurus-linux.qualcomm.com ([10.46.162.81]) by ironmsg05-sd.qualcomm.com with ESMTP; 21 Apr 2020 19:57:27 -0700 Received: by gurus-linux.qualcomm.com (Postfix, from userid 383780) id 20E384C78; Tue, 21 Apr 2020 19:57:27 -0700 (PDT) From: Guru Das Srinagesh To: linux-pwm@vger.kernel.org Cc: Thierry Reding , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Subbaraman Narayanamurthy , David Collins , linux-kernel@vger.kernel.org, Guru Das Srinagesh , Michael Turquette , Stephen Boyd , linux-clk@vger.kernel.org Subject: [PATCH v13 10/11] clk: pwm: Use 64-bit division function Date: Tue, 21 Apr 2020 19:57:22 -0700 Message-Id: <0efec2ac3e9d9d8d7d71e29c9ab7cdcbb02d137d.1587523702.git.gurus@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since the PWM framework is switching struct pwm_args.period's datatype to u64, prepare for this transition by using div64_u64 to handle a 64-bit divisor. Also ensure that divide-by-zero (with fixed_rate as denominator) does not happen with an explicit check with probe failure as a consequence. To: David Laight To: Arnd Bergmann Cc: Michael Turquette Cc: Stephen Boyd Cc: linux-clk@vger.kernel.org Signed-off-by: Guru Das Srinagesh --- drivers/clk/clk-pwm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-pwm.c b/drivers/clk/clk-pwm.c index 87fe0b0e..86f2e2d 100644 --- a/drivers/clk/clk-pwm.c +++ b/drivers/clk/clk-pwm.c @@ -89,7 +89,12 @@ static int clk_pwm_probe(struct platform_device *pdev) } if (of_property_read_u32(node, "clock-frequency", &clk_pwm->fixed_rate)) - clk_pwm->fixed_rate = NSEC_PER_SEC / pargs.period; + clk_pwm->fixed_rate = div64_u64(NSEC_PER_SEC, pargs.period); + + if (!clk_pwm->fixed_rate) { + dev_err(&pdev->dev, "fixed_rate cannot be zero\n"); + return -EINVAL; + } if (pargs.period != NSEC_PER_SEC / clk_pwm->fixed_rate && pargs.period != DIV_ROUND_UP(NSEC_PER_SEC, clk_pwm->fixed_rate)) { -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project