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path: root/drivers/rtc/rtc-mv.c
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Diffstat (limited to 'drivers/rtc/rtc-mv.c')
-rw-r--r--drivers/rtc/rtc-mv.c51
1 files changed, 30 insertions, 21 deletions
diff --git a/drivers/rtc/rtc-mv.c b/drivers/rtc/rtc-mv.c
index 57233c885998..baab802f2153 100644
--- a/drivers/rtc/rtc-mv.c
+++ b/drivers/rtc/rtc-mv.c
@@ -14,6 +14,7 @@
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/delay.h>
+#include <linux/clk.h>
#include <linux/gfp.h>
#include <linux/module.h>
@@ -41,6 +42,7 @@ struct rtc_plat_data {
struct rtc_device *rtc;
void __iomem *ioaddr;
int irq;
+ struct clk *clk;
};
static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
@@ -215,12 +217,13 @@ static const struct rtc_class_ops mv_rtc_alarm_ops = {
.alarm_irq_enable = mv_rtc_alarm_irq_enable,
};
-static int mv_rtc_probe(struct platform_device *pdev)
+static int __init mv_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
struct rtc_plat_data *pdata;
resource_size_t size;
u32 rtc_time;
+ int ret = 0;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
@@ -239,11 +242,17 @@ static int mv_rtc_probe(struct platform_device *pdev)
if (!pdata->ioaddr)
return -ENOMEM;
+ pdata->clk = devm_clk_get(&pdev->dev, NULL);
+ /* Not all SoCs require a clock.*/
+ if (!IS_ERR(pdata->clk))
+ clk_prepare_enable(pdata->clk);
+
/* make sure the 24 hours mode is enabled */
rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
if (rtc_time & RTC_HOURS_12H_MODE) {
dev_err(&pdev->dev, "24 Hours mode not supported.\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
/* make sure it is actually functional */
@@ -252,7 +261,8 @@ static int mv_rtc_probe(struct platform_device *pdev)
rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
if (rtc_time == 0x01000000) {
dev_err(&pdev->dev, "internal RTC not ticking\n");
- return -ENODEV;
+ ret = -ENODEV;
+ goto out;
}
}
@@ -262,14 +272,17 @@ static int mv_rtc_probe(struct platform_device *pdev)
if (pdata->irq >= 0) {
device_init_wakeup(&pdev->dev, 1);
- pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
+ pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&mv_rtc_alarm_ops,
THIS_MODULE);
- } else
- pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
+ } else {
+ pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&mv_rtc_ops, THIS_MODULE);
- if (IS_ERR(pdata->rtc))
- return PTR_ERR(pdata->rtc);
+ }
+ if (IS_ERR(pdata->rtc)) {
+ ret = PTR_ERR(pdata->rtc);
+ goto out;
+ }
if (pdata->irq >= 0) {
writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
@@ -282,6 +295,11 @@ static int mv_rtc_probe(struct platform_device *pdev)
}
return 0;
+out:
+ if (!IS_ERR(pdata->clk))
+ clk_disable_unprepare(pdata->clk);
+
+ return ret;
}
static int __exit mv_rtc_remove(struct platform_device *pdev)
@@ -291,7 +309,9 @@ static int __exit mv_rtc_remove(struct platform_device *pdev)
if (pdata->irq >= 0)
device_init_wakeup(&pdev->dev, 0);
- rtc_device_unregister(pdata->rtc);
+ if (!IS_ERR(pdata->clk))
+ clk_disable_unprepare(pdata->clk);
+
return 0;
}
@@ -311,18 +331,7 @@ static struct platform_driver mv_rtc_driver = {
},
};
-static __init int mv_init(void)
-{
- return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
-}
-
-static __exit void mv_exit(void)
-{
- platform_driver_unregister(&mv_rtc_driver);
-}
-
-module_init(mv_init);
-module_exit(mv_exit);
+module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
MODULE_DESCRIPTION("Marvell RTC driver");