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Subject[[PATCHv2] 3/3] drivers/rtc/rtc-snvs: Add clock support
Date
This patch adds clock enable and disable support for
the SNVS peripheral, which is required for using the
RTC within the SNVS block.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
---
drivers/rtc/rtc-snvs.c | 34 ++++++++++++++++++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index fa384fe..d4a6512 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
@@ -302,16 +322,26 @@ 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
--
1.7.9.5


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