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[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 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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170915_070545_983839_694DBD3A X-CRM114-Status: GOOD ( 14.68 ) X-Spam-Score: -2.0 (--) X-Spam-Report: SpamAssassin version 3.4.1 on bombadil.infradead.org summary: Content analysis details: (-2.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2a00:1450:400c:c09:0:0:0:241 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (romain.izard.pro[at]gmail.com) -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-pwm@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-serial@vger.kernel.org, Romain Izard , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.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, }, };