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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 BE517C41621 for ; Tue, 24 Mar 2020 09:42:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9CE4E20775 for ; Tue, 24 Mar 2020 09:42:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727366AbgCXJmM (ORCPT ); Tue, 24 Mar 2020 05:42:12 -0400 Received: from relay6-d.mail.gandi.net ([217.70.183.198]:45807 "EHLO relay6-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727223AbgCXJmM (ORCPT ); Tue, 24 Mar 2020 05:42:12 -0400 X-Originating-IP: 86.202.105.35 Received: from localhost (lfbn-lyo-1-9-35.w86-202.abo.wanadoo.fr [86.202.105.35]) (Authenticated sender: alexandre.belloni@bootlin.com) by relay6-d.mail.gandi.net (Postfix) with ESMTPSA id DCD5FC000F; Tue, 24 Mar 2020 09:42:10 +0000 (UTC) Date: Tue, 24 Mar 2020 10:42:09 +0100 From: Alexandre Belloni To: xiaolinkui Cc: a.zummo@towertech.it, linux-rtc@vger.kernel.org Subject: Re: [PATCH] rtc: Kconfig: change the tristate type to bool Message-ID: <20200324094209.GI5504@piout.net> References: <20200323124339.6520-1-xiaolinkui@tj.kylinos.cn> <20200323134335.GC5504@piout.net> <336f9aea-d28a-d114-9a0c-a893d9cb9af3@tj.kylinos.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <336f9aea-d28a-d114-9a0c-a893d9cb9af3@tj.kylinos.cn> Sender: linux-rtc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rtc@vger.kernel.org On 24/03/2020 17:33:00+0800, xiaolinkui wrote: > On 3/23/20 9:43 PM, Alexandre Belloni wrote: > > On 23/03/2020 20:43:39+0800, xiaolinkui wrote: > > > If the rtc driver is compiled into a module, hctosys can't > > > read the rtc clock during system startup. > > > The dmesg log will have the following information: > > > > > > [ 2.286512] hctosys: unable to open rtc device (rtc0) > > > > > > So the rtc driver configuration we need cannot be set to m. > > > > > Wow, you are not even trying, the solution is to not use hctosys. > > > > > Thank you for your reply. Yes, if we don't use hctosys, we won't have this > problem. But　without hctosys, we cannot get the clock from rtc during > system startup.  Is it wrong for the　system time each time the system is > started for a machine without Internet access? > Your userspace can read the RTC and set the system time properly. -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com