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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED374C636D3 for ; Wed, 1 Feb 2023 14:43:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232529AbjBAOnM (ORCPT ); Wed, 1 Feb 2023 09:43:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232462AbjBAOnK (ORCPT ); Wed, 1 Feb 2023 09:43:10 -0500 X-Greylist: delayed 491 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Wed, 01 Feb 2023 06:43:05 PST Received: from mail.fris.de (mail.fris.de [116.203.77.234]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C03D2E80B; Wed, 1 Feb 2023 06:43:03 -0800 (PST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 432F6C033C; Wed, 1 Feb 2023 15:35:06 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fris.de; s=dkim; t=1675262109; h=from:subject:date:message-id:to:cc:mime-version: content-transfer-encoding:in-reply-to:references; bh=wvJB0OUDEjfjJl0NbgwhqGyfXYoeQO+CyeH0uszLyk0=; b=silF0PZRDEQ+cRx3MXl+8ZK4MfXSgw/Xeu5H/4fxJDygDKC88Zw65FY6WVG3pWEQ9DEWc0 Liz7qJ8O4M71oGThvh+zL2SIYCziQcwpNs8/M2KvA0TumO6qOo0g0pGIoyNDxteHsGkHG2 JxyR7kAoeie/HU69iXi7Wvt5qD+zNPrtwdBFTN1M6Y1AAHwsVQkyJJc8WUNoyt5lGWhtI4 eH5KZfnH8tUtL7cFta9BVXp0h6vqDYuoBkzey2F4UrBFonlCOrJwfx17HVJTVX1uAhfemC zFR0NAH3zLARFWNLNg4cVG1cAPOm3hRP+kjVFxtAAYUTB3+Uw6o6xBYgg1fAgw== From: Frieder Schrempf To: Alessandro Zummo , Alexandre Belloni , linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org Cc: Frieder Schrempf , keliu , Shang XiaoJing , Vincent Whitchurch , Yang Yingliang Subject: [PATCH 5/7] rtc: class: Support setting backup switch mode from devicetree Date: Wed, 1 Feb 2023 15:34:27 +0100 Message-Id: <20230201143431.863784-6-frieder@fris.de> In-Reply-To: <20230201143431.863784-1-frieder@fris.de> References: <20230201143431.863784-1-frieder@fris.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 Precedence: bulk List-ID: X-Mailing-List: linux-rtc@vger.kernel.org From: Frieder Schrempf Some RTC devices like the RV3028 have BSM disabled as factory default. This makes the RTC quite useless if it is expected to preserve the time on hardware that has a battery buffered supply for the RTC. Let boards that have a buffered supply for the RTC available force the BSM to the desired value via devicetree by setting the 'backup-switch-mode' property. Signed-off-by: Frieder Schrempf --- drivers/rtc/class.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index e5b7b48cffac..79417d1fbeee 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -391,6 +391,11 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc) struct rtc_wkalrm alrm; int err; + struct rtc_param bsm = { + .param = RTC_PARAM_BACKUP_SWITCH_MODE, + .uvalue = RTC_BSM_DISABLED, + }; + if (!rtc->ops) { dev_dbg(&rtc->dev, "no ops set\n"); return -EINVAL; @@ -402,6 +407,15 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc) if (rtc->ops->set_offset) set_bit(RTC_FEATURE_CORRECTION, rtc->features); + /* setup backup switching mode */ + if (test_bit(RTC_FEATURE_BACKUP_SWITCH_MODE, rtc->features) && + !device_property_read_u32(rtc->dev.parent, "backup-switch-mode", + (u32 *)&bsm.uvalue)) { + err = rtc->ops->param_set(rtc->dev.parent, &bsm); + if (err && err != -EINVAL) + return err; + } + rtc->owner = owner; rtc_device_get_offset(rtc); -- 2.39.1