From patchwork Thu Aug 1 14:31:11 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laxman Dewangan X-Patchwork-Id: 264026 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from mail-oa0-x240.google.com (mail-oa0-x240.google.com [IPv6:2607:f8b0:4003:c02::240]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (not verified)) by ozlabs.org (Postfix) with ESMTPS id CC4022C008A for ; Fri, 2 Aug 2013 00:18:45 +1000 (EST) Received: by mail-oa0-f64.google.com with SMTP id l20sf655629oag.29 for ; Thu, 01 Aug 2013 07:18:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlegroups.com; s=20120806; h=x-beenthere:x-pgp-universal:from:to:cc:subject:date:message-id :x-mailer:mime-version:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-google-group-id:list-post:list-help:list-archive:sender :list-subscribe:list-unsubscribe:content-type; bh=2V8Dxc+QcW4w462tmluyj6EvvJP2rbo/AzaLuzWDfPc=; b=JjD1hrFooO3A6qSdXLPa2cpxKWyCKD2sysdnuyYtuTrPV4M5tP0s2YdIkv4H4dV1sc U03ulQwHK2Fl7bMtaqlhqIUbZZHCySVeHUnDfY6BdahjxF30T+XMe6tC+zo8LJjCMB+S RuwU+yyg/zGWj5IfZy8C3gWt0j1w/6WKrf5lveqtJVPiSgENcx71tOjLJuUmzLXXbOpb 9VQkDkGU6U2McA9rRTw3SuTmBKWxvsYBUW62mE0vhNYAPE+3xVJ283xRXvStB14E0+Qq Bw4Kt0vKj4RsSqFogOzF7rsqP3eXr//EWC5bF3+pzwisJgtzaJyoTjkq9D5GpMufH4Wf 1kCg== X-Received: by 10.50.11.69 with SMTP id o5mr819871igb.13.1375366723273; Thu, 01 Aug 2013 07:18:43 -0700 (PDT) X-BeenThere: rtc-linux@googlegroups.com Received: by 10.50.108.45 with SMTP id hh13ls1681034igb.29.gmail; Thu, 01 Aug 2013 07:18:42 -0700 (PDT) X-Received: by 10.66.219.33 with SMTP id pl1mr1131694pac.37.1375366722832; Thu, 01 Aug 2013 07:18:42 -0700 (PDT) Received: from hqemgate15.nvidia.com (hqemgate15.nvidia.com. [216.228.121.64]) by gmr-mx.google.com with ESMTPS id tr6si432908pbc.1.2013.08.01.07.18.42 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 01 Aug 2013 07:18:42 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of ldewangan@nvidia.com designates 216.228.121.64 as permitted sender) client-ip=216.228.121.64; Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com id ; Thu, 01 Aug 2013 07:18:38 -0700 Received: from hqemhub03.nvidia.com ([172.20.12.94]) by hqnvupgp08.nvidia.com (PGP Universal service); Thu, 01 Aug 2013 07:17:14 -0700 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Thu, 01 Aug 2013 07:17:14 -0700 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQEMHUB03.nvidia.com (172.20.150.15) with Microsoft SMTP Server id 8.3.298.1; Thu, 1 Aug 2013 07:18:42 -0700 Received: from sc-daphne.nvidia.com (Not Verified[172.20.232.60]) by hqnvemgw01.nvidia.com with MailMarshal (v7,1,2,5326) id ; Thu, 01 Aug 2013 07:18:42 -0700 Received: from ldewangan-ubuntu.nvidia.com ([10.19.65.30]) by sc-daphne.nvidia.com (8.13.8+Sun/8.8.8) with ESMTP id r71EIZ1L015981; Thu, 1 Aug 2013 07:18:36 -0700 (PDT) From: Laxman Dewangan To: CC: , , , , , , , , , , , , , , Laxman Dewangan Subject: [rtc-linux] [PATCH V2] drivers/rtc/rtc-palmas.c: support for backup battery charging Date: Thu, 1 Aug 2013 20:01:11 +0530 Message-ID: <1375367471-29908-1-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 1.7.1.1 MIME-Version: 1.0 X-Original-Sender: ldewangan@nvidia.com X-Original-Authentication-Results: gmr-mx.google.com; spf=pass (google.com: best guess record for domain of ldewangan@nvidia.com designates 216.228.121.64 as permitted sender) smtp.mail=ldewangan@nvidia.com Reply-To: rtc-linux@googlegroups.com Precedence: list Mailing-list: list rtc-linux@googlegroups.com; contact rtc-linux+owners@googlegroups.com List-ID: X-Google-Group-Id: 712029733259 List-Post: , List-Help: , List-Archive: Sender: rtc-linux@googlegroups.com List-Subscribe: , List-Unsubscribe: , Palmas series device like TPS65913, TPS80036 supports the backup battery for powering the RTC when no other energy source is available. The backup battery is optional, connected to the VBACKUP pin, and can be nonrechargeable or rechargeable. The rechargeable battery can be charged from the system supply using the backup battery charger. Add support for enabling charging of this backup battery. Also add the DT binding document and the new properties to have this support. Signed-off-by: Laxman Dewangan Reviewed-by: Felipe Balbi Reviewed-by: Stephen Warren --- Changes from V1: - Converted DT property to boolean. - cleanups as use "...". .../devicetree/bindings/rtc/rtc-palmas.txt | 28 ++++++++++++++++ drivers/rtc/rtc-palmas.c | 35 ++++++++++++++++++++ 2 files changed, 63 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/rtc/rtc-palmas.txt diff --git a/Documentation/devicetree/bindings/rtc/rtc-palmas.txt b/Documentation/devicetree/bindings/rtc/rtc-palmas.txt new file mode 100644 index 0000000..c8c9def --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/rtc-palmas.txt @@ -0,0 +1,28 @@ +Palmas RTC controller bindings + +Required properties: +- compatible: + - "ti,palmas-rtc" for palma series of the RTC controller +- interrupt-parent: Parent interrupt device, must be handle of palmas node. +- interrupts: Interrupt number of RTC submodule on device. + +Optional properties: +- ti,back-battery-charge-enable: The palmas series device like TPS65913 or + TPS80036 supports the battery backup for powering the RTC when main + battery is removed or in very low power state. This flag will enable + the backup battery charging. +- ti,back-charge-low-current: Configure lower charging current. Device supports the + charging current as < 100mA or >100mA. Low current will set as <100mA. + +Example: + palmas: tps65913@58 { + ... + palmas_rtc: rtc { + compatible = "ti,palmas-rtc"; + interrupt-parent = <&palmas>; + interrupts = <8 0>; + ti,back-battery-charge-enable; + ti,back-charge-low-current; + }; + ... + }; diff --git a/drivers/rtc/rtc-palmas.c b/drivers/rtc/rtc-palmas.c index a1fecc8..7f34e33 100644 --- a/drivers/rtc/rtc-palmas.c +++ b/drivers/rtc/rtc-palmas.c @@ -238,6 +238,15 @@ static int palmas_rtc_probe(struct platform_device *pdev) struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); struct palmas_rtc *palmas_rtc = NULL; int ret; + bool enable_bb_charging = false; + bool low_bb_charging; + + if (pdev->dev.of_node) { + enable_bb_charging = of_property_read_bool(pdev->dev.of_node, + "ti,back-battery-charge-enable"); + low_bb_charging = of_property_read_bool(pdev->dev.of_node, + "ti,back-charge-low-current"); + } palmas_rtc = devm_kzalloc(&pdev->dev, sizeof(struct palmas_rtc), GFP_KERNEL); @@ -254,6 +263,32 @@ static int palmas_rtc_probe(struct platform_device *pdev) palmas_rtc->dev = &pdev->dev; platform_set_drvdata(pdev, palmas_rtc); + if (enable_bb_charging) { + unsigned reg = 0; + + if (low_bb_charging) + reg |= PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG; + + ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, + PALMAS_BACKUP_BATTERY_CTRL, + PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG, reg); + if (ret < 0) { + dev_err(&pdev->dev, + "BACKUP_BATTERY_CTRL update failed, %d\n", ret); + return ret; + } + + ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, + PALMAS_BACKUP_BATTERY_CTRL, + PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN, + PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN); + if (ret < 0) { + dev_err(&pdev->dev, + "BACKUP_BATTERY_CTRL update failed, %d\n", ret); + return ret; + } + } + /* Start RTC */ ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, PALMAS_RTC_CTRL_REG_STOP_RTC,