From patchwork Fri Sep 15 14:04:10 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Romain Izard X-Patchwork-Id: 814287 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="Vz4eHogN"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3xtxyJ3rXhz9s7m for ; Sat, 16 Sep 2017 00:06:00 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751807AbdIOOF3 (ORCPT ); Fri, 15 Sep 2017 10:05:29 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:36110 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751763AbdIOOFZ (ORCPT ); Fri, 15 Sep 2017 10:05:25 -0400 Received: by mail-wm0-f68.google.com with SMTP id r136so2880284wmf.3; Fri, 15 Sep 2017 07:05:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=ODEsLfkb3lvipUolMLb7ScB3ja2VrqHu5R+0EqPP1yQ=; b=Vz4eHogNuFZtrs459jCkrZME/mXSzcY/ntIVWkZYaQacPkTHTx+njTFg+TGvC55/6i fxAGIbXjFhIcmzj0/tIpQRqw2vlkWTX+9tXreC8ftfeMtkQ+h2LVNgTDzRdKsFmA1h0l BoUx8D/ChIvJeCrHFobMw65IwnmDw1G8b8LJIWg9foQhuHm4QZtvlouSzxYIVHIYYoor Siso/gJKctJhI44NEv6Q+WINXYZhpFW5Z7Nd7GWgv0pqGNRgri6O8T9t8B6vYUYvXOk2 6JU/qDokz5guhug6069TrZgeBZ7+jkWj7YyctmMZO3teypn/pzbGdhNt5dtTVsMhXshh uhtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ODEsLfkb3lvipUolMLb7ScB3ja2VrqHu5R+0EqPP1yQ=; b=AJL12iN+OcWBUrMOT/VIp8pSlHOZ65ancj8UVf7NJq+k2R4clcu9ArD8w6l/gGiYkc M8nFwAJtpwCB15YHfJg698IT66j6jqOwOQJyPPrW+oHKKS+ZjawtEvhc/hGDP4bOgTYf dnAAMAGPZQJEAmhpYucl7z878eJ2f5tuyhnREAOWwtco+5z58LBAt+Ww2444QfowGvwu 3nVb4aBHt77Mm3zDWcYvu69QSpp8TDtuT6zWiniEdd5fE4owexrSSBAmXCOTlG81hhc9 dq8Wg+9dWmbjxeQ1VMVoyN8KLA7V3FKYt1EcpVVL5NePTGRrjBCtZur2PwD2XRZ1x9kS dxlg== X-Gm-Message-State: AHPjjUgtaE6MXHRmBAj0srwQ4MXioYrixqfDi6WnukqVCCfR13JwZxEq yNXY4gq5hAGVfA== X-Google-Smtp-Source: AOwi7QCOef+RXEJBnjjDFj/p05u60boDHKBXpRxZDqyBH0nHdF2araAMSHn2pIOqKXfTYBc49j6e7w== X-Received: by 10.28.60.8 with SMTP id j8mr2670666wma.16.1505484323627; Fri, 15 Sep 2017 07:05:23 -0700 (PDT) Received: from localhost.localdomain (146.187.3.109.rev.sfr.net. [109.3.187.146]) by smtp.gmail.com with ESMTPSA id 55sm1399225wrw.60.2017.09.15.07.05.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 15 Sep 2017 07:05:23 -0700 (PDT) From: Romain Izard To: Nicolas Ferre , Alexandre Belloni , Boris Brezillon , Michael Turquette , Stephen Boyd , Ludovic Desroches , Wenyou Yang , Josh Wu , David Woodhouse , Brian Norris , Marek Vasut , Cyrille Pitchen , Thierry Reding , Richard Genoud , Greg Kroah-Hartman , Alan Stern Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-pwm@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Romain Izard Subject: [PATCH v2 8/9] atmel_flexcom: Support backup mode Date: Fri, 15 Sep 2017 16:04:10 +0200 Message-Id: <20170915140411.31716-9-romain.izard.pro@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170915140411.31716-1-romain.izard.pro@gmail.com> References: <20170915140411.31716-1-romain.izard.pro@gmail.com> Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org The controller used by a flexcom module is configured at boot, and left alone after this. As the configuration will be lost after backup mode, restore the state of the flexcom driver on resume. Signed-off-by: Romain Izard Tested-by: Nicolas Ferre Acked-by: Nicolas Ferre --- drivers/mfd/atmel-flexcom.c | 65 ++++++++++++++++++++++++++++++++++----------- 1 file changed, 50 insertions(+), 15 deletions(-) diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c index 064bde9cff5a..ef1235c4a179 100644 --- a/drivers/mfd/atmel-flexcom.c +++ b/drivers/mfd/atmel-flexcom.c @@ -39,34 +39,44 @@ #define FLEX_MR_OPMODE(opmode) (((opmode) << FLEX_MR_OPMODE_OFFSET) & \ FLEX_MR_OPMODE_MASK) +struct atmel_flexcom { + void __iomem *base; + u32 opmode; + struct clk *clk; +}; static int atmel_flexcom_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; - struct clk *clk; struct resource *res; - void __iomem *base; - u32 opmode; + struct atmel_flexcom *afc; int err; + u32 val; + + afc = devm_kzalloc(&pdev->dev, sizeof(*afc), GFP_KERNEL); + if (!afc) + return -ENOMEM; - err = of_property_read_u32(np, "atmel,flexcom-mode", &opmode); + platform_set_drvdata(pdev, afc); + + err = of_property_read_u32(np, "atmel,flexcom-mode", &afc->opmode); if (err) return err; - if (opmode < ATMEL_FLEXCOM_MODE_USART || - opmode > ATMEL_FLEXCOM_MODE_TWI) + if (afc->opmode < ATMEL_FLEXCOM_MODE_USART || + afc->opmode > ATMEL_FLEXCOM_MODE_TWI) return -EINVAL; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(base)) - return PTR_ERR(base); + afc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(afc->base)) + return PTR_ERR(afc->base); - clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(clk)) - return PTR_ERR(clk); + afc->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(afc->clk)) + return PTR_ERR(afc->clk); - err = clk_prepare_enable(clk); + err = clk_prepare_enable(afc->clk); if (err) return err; @@ -76,9 +86,10 @@ static int atmel_flexcom_probe(struct platform_device *pdev) * inaccessible and are read as zero. Also the external I/O lines of the * Flexcom are muxed to reach the selected device. */ - writel(FLEX_MR_OPMODE(opmode), base + FLEX_MR); + val = FLEX_MR_OPMODE(afc->opmode); + writel(val, afc->base + FLEX_MR); - clk_disable_unprepare(clk); + clk_disable_unprepare(afc->clk); return devm_of_platform_populate(&pdev->dev); } @@ -89,10 +100,34 @@ static const struct of_device_id atmel_flexcom_of_match[] = { }; MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match); +#ifdef CONFIG_PM_SLEEP +static int atmel_flexcom_resume(struct device *dev) +{ + struct atmel_flexcom *afc = dev_get_drvdata(dev); + int err; + u32 val; + + err = clk_prepare_enable(afc->clk); + if (err) + return err; + + val = FLEX_MR_OPMODE(afc->opmode), + writel(val, afc->base + FLEX_MR); + + clk_disable_unprepare(afc->clk); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL, + atmel_flexcom_resume); + static struct platform_driver atmel_flexcom_driver = { .probe = atmel_flexcom_probe, .driver = { .name = "atmel_flexcom", + .pm = &atmel_flexcom_pm_ops, .of_match_table = atmel_flexcom_of_match, }, };