From: Romain Izard <romain.izard.pro@gmail.com>
To: Nicolas Ferre <nicolas.ferre@microchip.com>,
Alexandre Belloni <alexandre.belloni@free-electrons.com>,
Boris Brezillon <boris.brezillon@free-electrons.com>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>,
Ludovic Desroches <ludovic.desroches@microchip.com>,
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-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 v2 8/9] atmel_flexcom: Support backup mode
Date: Fri, 15 Sep 2017 16:04:10 +0200 [thread overview]
Message-ID: <20170915140411.31716-9-romain.izard.pro@gmail.com> (raw)
In-Reply-To: <20170915140411.31716-1-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:[~2017-09-15 14:05 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-15 14:04 [PATCH v2 0/9] Various patches for SAMA5D2 backup mode Romain Izard
2017-09-15 14:04 ` [PATCH v2 1/9] clk: at91: pmc: Wait for clocks when resuming Romain Izard
2017-09-22 12:05 ` Ludovic Desroches
2017-09-22 12:13 ` Nicolas Ferre
2017-09-15 14:04 ` [PATCH v2 2/9] clk: at91: pmc: Save SCSR during suspend Romain Izard
2017-09-15 14:04 ` [PATCH v2 3/9] clk: at91: pmc: Support backup for programmable clocks Romain Izard
2017-09-22 10:31 ` Nicolas Ferre
2017-09-25 8:25 ` Romain Izard
2017-09-15 14:04 ` [PATCH v2 4/9] mtd: nand: atmel: Avoid ECC errors when leaving backup mode Romain Izard
2017-09-18 9:50 ` Boris Brezillon
2017-09-15 14:04 ` [PATCH v2 5/9] mtd: nand: atmel: Report PMECC failures as errors Romain Izard
2017-09-18 10:00 ` Boris Brezillon
2017-09-21 9:22 ` Romain Izard
2017-09-15 14:04 ` [PATCH v2 6/9] ehci-atmel: Power down during suspend is normal Romain Izard
2017-09-22 12:40 ` Nicolas Ferre
2017-09-15 14:04 ` [PATCH v2 7/9] pwm: atmel-tcb: Support backup mode Romain Izard
2017-09-22 12:42 ` Nicolas Ferre
2017-09-15 14:04 ` Romain Izard [this message]
2017-09-19 9:29 ` [PATCH v2 8/9] atmel_flexcom: " Nicolas Ferre
2017-09-19 15:25 ` Lee Jones
2017-09-20 8:30 ` Romain Izard
2017-09-20 9:18 ` Alexandre Belloni
2017-09-15 14:04 ` [PATCH v2 9/9] tty/serial: atmel: Prevent a warning on suspend Romain Izard
2017-09-19 10:19 ` Nicolas Ferre
2017-09-20 14:35 ` Richard Genoud
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