From patchwork Tue Jan 21 09:12:30 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ezequiel Garcia X-Patchwork-Id: 312831 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id F07222C00A6 for ; Tue, 21 Jan 2014 20:12:48 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753955AbaAUJMs (ORCPT ); Tue, 21 Jan 2014 04:12:48 -0500 Received: from top.free-electrons.com ([176.31.233.9]:39671 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753900AbaAUJMr (ORCPT ); Tue, 21 Jan 2014 04:12:47 -0500 Received: by mail.free-electrons.com (Postfix, from userid 106) id 75855831; Tue, 21 Jan 2014 10:12:56 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.3.2 Received: from localhost.localdomain (unknown [190.2.98.212]) by mail.free-electrons.com (Postfix) with ESMTPA id 61CAE750; Tue, 21 Jan 2014 10:12:52 +0100 (CET) From: Ezequiel Garcia To: , , Cc: Wim Van Sebroeck , Gregory Clement , Lior Amsalem , Tawfik Bayouk , Thomas Petazzoni , Jason Cooper , Sebastian Hesselbarth , Jason Gunthorpe , Andrew Lunn , Ezequiel Garcia Subject: [PATCH v2 04/15] watchdog: orion: Handle IRQ Date: Tue, 21 Jan 2014 06:12:30 -0300 Message-Id: <1390295561-3466-5-git-send-email-ezequiel.garcia@free-electrons.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1390295561-3466-1-git-send-email-ezequiel.garcia@free-electrons.com> References: <1390295561-3466-1-git-send-email-ezequiel.garcia@free-electrons.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org DT-enabled where an irqchip driver for the brigde interrupt controller is available can handle the watchdog IRQ properly. Therefore, we request the interruption and add a dummy handler that merely calls panic(). This is done in order to have an initial 'ack' of the interruption, which clears the watchdog state. Furthermore, since some platforms don't have such IRQ, this commit makes the interruption specification optional. Signed-off-by: Ezequiel Garcia --- .../devicetree/bindings/watchdog/marvel.txt | 2 ++ drivers/watchdog/orion_wdt.c | 22 +++++++++++++++++++++- 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/watchdog/marvel.txt b/Documentation/devicetree/bindings/watchdog/marvel.txt index 5dc8d30..0731fbd 100644 --- a/Documentation/devicetree/bindings/watchdog/marvel.txt +++ b/Documentation/devicetree/bindings/watchdog/marvel.txt @@ -7,6 +7,7 @@ Required Properties: Optional properties: +- interrupts : Contains the IRQ for watchdog expiration - timeout-sec : Contains the watchdog timeout in seconds Example: @@ -14,6 +15,7 @@ Example: wdt@20300 { compatible = "marvell,orion-wdt"; reg = <0x20300 0x28>; + interrupts = <3>; timeout-sec = <10>; status = "okay"; }; diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c index cf64510..06e766f 100644 --- a/drivers/watchdog/orion_wdt.c +++ b/drivers/watchdog/orion_wdt.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -131,10 +132,16 @@ static struct watchdog_device orion_wdt = { .min_timeout = 1, }; +static irqreturn_t orion_wdt_irq(int irq, void *devid) +{ + panic("Watchdog Timeout"); + return IRQ_HANDLED; +} + static int orion_wdt_probe(struct platform_device *pdev) { struct resource *res; - int ret; + int ret, irq; clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(clk)) { @@ -151,6 +158,19 @@ static int orion_wdt_probe(struct platform_device *pdev) if (!wdt_reg) return -ENOMEM; + irq = platform_get_irq(pdev, 0); + if (irq > 0) { + /* + * Not all supported platforms specify an interruption for the + * watchdog, so let's make it optional. + */ + ret = request_irq(irq, orion_wdt_irq, 0, pdev->name, NULL); + if (ret < 0) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + return ret; + } + } + wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk; orion_wdt.timeout = wdt_max_duration;