From: Romain Izard <romain.izard.pro@gmail.com> To: Nicolas Ferre <nicolas.ferre@microchip.com>, Boris Brezillon <boris.brezillon@free-electrons.com>, Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@codeaurora.org>, Ludovic Desroches <ludovic.desroches@microchip.com>, Jonathan Cameron <jic23@kernel.org>, Wenyou Yang <wenyou.yang@atmel.com>, Josh Wu <rainyfeeling@outlook.com>, David Woodhouse <dwmw2@infradead.org>, Brian Norris <computersforpeace@gmail.com>, Marek Vasut <marek.vasut@gmail.com>, Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>, Thierry Reding <thierry.reding@gmail.com>, Richard Genoud <richard.genoud@gmail.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Alan Stern <stern@rowland.harvard.edu> Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@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 <romain.izard.pro@gmail.com> Subject: [PATCH v1 09/10] atmel_flexcom: Support backup mode Date: Fri, 8 Sep 2017 17:36:03 +0200 [thread overview] Message-ID: <20170908153604.28383-10-romain.izard.pro@gmail.com> (raw) In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com> 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 <romain.izard.pro@gmail.com> --- 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, }, }; -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: romain.izard.pro@gmail.com (Romain Izard) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v1 09/10] atmel_flexcom: Support backup mode Date: Fri, 8 Sep 2017 17:36:03 +0200 [thread overview] Message-ID: <20170908153604.28383-10-romain.izard.pro@gmail.com> (raw) In-Reply-To: <20170908153604.28383-1-romain.izard.pro@gmail.com> 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 <romain.izard.pro@gmail.com> --- 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, }, }; -- 2.11.0
next prev parent reply other threads:[~2017-09-08 15:36 UTC|newest] Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-09-08 15:35 [PATCH v1 00/10] Various patches for SAMA5D2 backup mode Romain Izard 2017-09-08 15:35 ` Romain Izard 2017-09-08 15:35 ` [PATCH v1 01/10] clk: at91: pmc: Wait for clocks when resuming Romain Izard 2017-09-08 15:35 ` Romain Izard 2017-09-13 12:15 ` Nicolas Ferre 2017-09-13 12:15 ` Nicolas Ferre 2017-09-13 12:15 ` Nicolas Ferre 2017-09-14 16:15 ` Romain Izard 2017-09-14 16:15 ` Romain Izard 2017-09-14 16:15 ` Romain Izard 2017-09-22 12:12 ` Nicolas Ferre 2017-09-22 12:12 ` Nicolas Ferre 2017-09-22 12:12 ` Nicolas Ferre 2017-09-08 15:35 ` [PATCH v1 02/10] clk: at91: pmc: Save SCSR during suspend Romain Izard 2017-09-08 15:35 ` Romain Izard 2017-09-08 15:35 ` Romain Izard 2017-09-13 12:10 ` Nicolas Ferre 2017-09-13 12:10 ` Nicolas Ferre 2017-09-13 12:10 ` Nicolas Ferre 2017-09-08 15:35 ` [PATCH v1 03/10] clk: at91: pmc: Support backup for programmable clocks Romain Izard 2017-09-08 15:35 ` Romain Izard 2017-09-13 12:29 ` Nicolas Ferre 2017-09-13 12:29 ` Nicolas Ferre 2017-09-13 12:29 ` Nicolas Ferre 2017-09-13 17:03 ` Alexandre Belloni 2017-09-13 17:03 ` Alexandre Belloni 2017-09-13 17:03 ` Alexandre Belloni 2017-09-14 7:41 ` romain izard 2017-09-14 7:41 ` romain izard 2017-09-14 7:41 ` romain izard 2017-09-14 9:38 ` Nicolas Ferre 2017-09-14 9:38 ` Nicolas Ferre 2017-09-14 9:38 ` Nicolas Ferre 2017-09-08 15:35 ` [PATCH v1 04/10] mtd: nand: atmel: Avoid ECC errors when leaving backup mode Romain Izard 2017-09-08 15:35 ` Romain Izard 2017-09-08 15:35 ` [PATCH v1 05/10] mtd: nand: atmel: Report PMECC failures as errors Romain Izard 2017-09-08 15:35 ` Romain Izard 2017-09-08 15:36 ` [PATCH v1 06/10] ehci-atmel: Power down during suspend is normal Romain Izard 2017-09-08 15:36 ` Romain Izard 2017-09-08 15:36 ` [PATCH v1 07/10] iio:adc:at91-sama5d2: Support backup mode Romain Izard 2017-09-08 15:36 ` Romain Izard 2017-09-08 16:03 ` Nicolas Ferre 2017-09-08 16:03 ` Nicolas Ferre 2017-09-08 16:03 ` Nicolas Ferre 2017-09-08 16:21 ` Romain Izard 2017-09-08 16:21 ` Romain Izard 2017-09-08 16:21 ` Romain Izard 2017-09-08 15:36 ` [PATCH v1 08/10] pwm: atmel-tcb: " Romain Izard 2017-09-08 15:36 ` Romain Izard 2017-09-08 15:36 ` Romain Izard 2017-09-08 15:36 ` Romain Izard [this message] 2017-09-08 15:36 ` [PATCH v1 09/10] atmel_flexcom: " Romain Izard 2017-09-08 15:36 ` [PATCH v1 10/10] tty/serial: atmel: Prevent a warning on suspend Romain Izard 2017-09-08 15:36 ` Romain Izard 2017-09-08 15:36 ` Romain Izard 2017-09-11 9:52 ` Romain Izard 2017-09-11 9:52 ` Romain Izard 2017-09-11 9:52 ` Romain Izard
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