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 Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E736CE7B5E0 for ; Wed, 4 Oct 2023 09:27:13 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 5FFFB87234; Wed, 4 Oct 2023 11:27:12 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Received: by phobos.denx.de (Postfix, from userid 109) id 6EBBD87235; Wed, 4 Oct 2023 11:27:11 +0200 (CEST) Received: from Atcsqr.andestech.com (60-248-80-70.hinet-ip.hinet.net [60.248.80.70]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id 8827387229 for ; Wed, 4 Oct 2023 11:27:07 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=ycliang@andestech.com Received: from mail.andestech.com (ATCPCS16.andestech.com [10.0.1.222]) by Atcsqr.andestech.com with ESMTP id 3949Qv75018078; Wed, 4 Oct 2023 17:26:57 +0800 (+08) (envelope-from ycliang@andestech.com) Received: from swlinux02 (10.0.15.183) by ATCPCS16.andestech.com (10.0.1.222) with Microsoft SMTP Server id 14.3.498.0; Wed, 4 Oct 2023 17:26:56 +0800 Date: Wed, 4 Oct 2023 17:24:59 +0800 From: Leo Liang To: Chanho Park CC: Rick Chen , Simon Glass , Subject: Re: [PATCH v3 2/3] riscv: timer: add timer_get_boot_us for BOOTSTAGE Message-ID: References: <20230906051814.1393464-1-chanho61.park@samsung.com> <20230906051814.1393464-3-chanho61.park@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20230906051814.1393464-3-chanho61.park@samsung.com> User-Agent: Mutt/2.2.10 (e0e92c31) (2023-03-25) X-Originating-IP: [10.0.15.183] X-DNSRBL: X-MAIL: Atcsqr.andestech.com 3949Qv75018078 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean On Wed, Sep 06, 2023 at 02:18:13PM +0900, Chanho Park wrote: > timer_get_boot_us function is required to record the boot stages as > us-based timestamp. > To get a micro-second time from a timer tick, this converts the > formula like below to avoid zero result of (tick / rate) part. > > From: time(us) = (tick / rate) * 10000000 > To : time(us) = (tick * 1000) / (rate / 1000) > > Signed-off-by: Chanho Park > --- > drivers/timer/riscv_timer.c | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) Reviewed-by: Leo Yu-Chi Liang