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path: root/drivers/rtc/rtc-snvs.c
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Diffstat (limited to 'drivers/rtc/rtc-snvs.c')
-rw-r--r--drivers/rtc/rtc-snvs.c51
1 files changed, 45 insertions, 6 deletions
diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index fa384fe28988..0479e807a776 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -17,6 +17,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
+#include <linux/clk.h>
/* These register offsets are relative to LP (Low Power) range */
#define SNVS_LPCR 0x04
@@ -39,6 +40,7 @@ struct snvs_rtc_data {
void __iomem *ioaddr;
int irq;
spinlock_t lock;
+ struct clk *clk;
};
static u32 rtc_read_lp_counter(void __iomem *ioaddr)
@@ -260,6 +262,18 @@ static int snvs_rtc_probe(struct platform_device *pdev)
if (data->irq < 0)
return data->irq;
+ data->clk = devm_clk_get(&pdev->dev, "snvs-rtc");
+ if (IS_ERR(data->clk)) {
+ data->clk = NULL;
+ } else {
+ ret = clk_prepare_enable(data->clk);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Could not prepare or enable the snvs clock\n");
+ return ret;
+ }
+ }
+
platform_set_drvdata(pdev, data);
spin_lock_init(&data->lock);
@@ -280,7 +294,7 @@ static int snvs_rtc_probe(struct platform_device *pdev)
if (ret) {
dev_err(&pdev->dev, "failed to request irq %d: %d\n",
data->irq, ret);
- return ret;
+ goto error_rtc_device_register;
}
data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
@@ -288,10 +302,16 @@ static int snvs_rtc_probe(struct platform_device *pdev)
if (IS_ERR(data->rtc)) {
ret = PTR_ERR(data->rtc);
dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
- return ret;
+ goto error_rtc_device_register;
}
return 0;
+
+error_rtc_device_register:
+ if (data->clk)
+ clk_disable_unprepare(data->clk);
+
+ return ret;
}
#ifdef CONFIG_PM_SLEEP
@@ -302,21 +322,41 @@ static int snvs_rtc_suspend(struct device *dev)
if (device_may_wakeup(dev))
enable_irq_wake(data->irq);
+ if (data->clk)
+ clk_disable_unprepare(data->clk);
+
return 0;
}
static int snvs_rtc_resume(struct device *dev)
{
struct snvs_rtc_data *data = dev_get_drvdata(dev);
+ int ret;
if (device_may_wakeup(dev))
disable_irq_wake(data->irq);
+ if (data->clk) {
+ ret = clk_prepare_enable(data->clk);
+ if (ret)
+ return ret;
+ }
+
return 0;
}
-#endif
-static SIMPLE_DEV_PM_OPS(snvs_rtc_pm_ops, snvs_rtc_suspend, snvs_rtc_resume);
+static const struct dev_pm_ops snvs_rtc_pm_ops = {
+ .suspend_noirq = snvs_rtc_suspend,
+ .resume_noirq = snvs_rtc_resume,
+};
+
+#define SNVS_RTC_PM_OPS (&snvs_rtc_pm_ops)
+
+#else
+
+#define SNVS_RTC_PM_OPS NULL
+
+#endif
static const struct of_device_id snvs_dt_ids[] = {
{ .compatible = "fsl,sec-v4.0-mon-rtc-lp", },
@@ -327,8 +367,7 @@ MODULE_DEVICE_TABLE(of, snvs_dt_ids);
static struct platform_driver snvs_rtc_driver = {
.driver = {
.name = "snvs_rtc",
- .owner = THIS_MODULE,
- .pm = &snvs_rtc_pm_ops,
+ .pm = SNVS_RTC_PM_OPS,
.of_match_table = snvs_dt_ids,
},
.probe = snvs_rtc_probe,