[PATCH v2 3/7] rtc: mt6397: improvements of rtc driver

Frank Wunderlich
2019-07-03T16:48:18Z

From: Josef Friedl <josef.friedl@speed.at>

- use regmap_read_poll_timeout to drop while-loop
- use devm-api to drop remove-callback
- add new compatible for mt6323

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
drivers/rtc/rtc-mt6397.c | 55 ++++++++++++++++------------------------
1 file changed, 22 insertions(+), 33 deletions(-)

diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index c08ee5edf865..e5ddf0d0b6f1 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -4,16 +4,19 @@
* Author: Tianping.Fang <tianping.fang@mediatek.com>
*/

-#include <linux/delay.h>
-#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/mt6397/core.h>
#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/mfd/mt6397/rtc.h>
+#include <linux/mod_devicetable.h>

static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
{
- unsigned long timeout = jiffies + HZ;
int ret;
u32 data;

@@ -21,19 +24,13 @@ static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
if (ret < 0)
return ret;

- while (1) {
- ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_BBPU,
- &data);
- if (ret < 0)
- break;
- if (!(data & RTC_BBPU_CBUSY))
- break;
- if (time_after(jiffies, timeout)) {
- ret = -ETIMEDOUT;
- break;
- }
- cpu_relax();
- }
+ ret = regmap_read_poll_timeout(rtc->regmap,
+ rtc->addr_base + RTC_BBPU, data,
+ !(data & RTC_BBPU_CBUSY),
+ MTK_RTC_POLL_DELAY_US,
+ MTK_RTC_POLL_TIMEOUT);
+ if (ret < 0)
+ dev_err(rtc->dev, "failed to write WRTGE: %d\n", ret);

return ret;
}
@@ -271,14 +268,11 @@ static int mtk_rtc_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, rtc);

- rtc->rtc_dev = devm_rtc_allocate_device(rtc->dev);
- if (IS_ERR(rtc->rtc_dev))
- return PTR_ERR(rtc->rtc_dev);
+ ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
+ mtk_rtc_irq_handler_thread,
+ IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
+ "mt6397-rtc", rtc);

- ret = request_threaded_irq(rtc->irq, NULL,
- mtk_rtc_irq_handler_thread,
- IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
- "mt6397-rtc", rtc);
if (ret) {
dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
rtc->irq, ret);
@@ -287,6 +281,10 @@ static int mtk_rtc_probe(struct platform_device *pdev)

device_init_wakeup(&pdev->dev, 1);

+ rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(rtc->rtc_dev))
+ return PTR_ERR(rtc->rtc_dev);
+
rtc->rtc_dev->ops = &mtk_rtc_ops;

ret = rtc_register_device(rtc->rtc_dev);
@@ -302,15 +300,6 @@ static int mtk_rtc_probe(struct platform_device *pdev)
return ret;
}

-static int mtk_rtc_remove(struct platform_device *pdev)
-{
- struct mt6397_rtc *rtc = platform_get_drvdata(pdev);
-
- free_irq(rtc->irq, rtc);
-
- return 0;
-}
-
#ifdef CONFIG_PM_SLEEP
static int mt6397_rtc_suspend(struct device *dev)
{
@@ -337,6 +326,7 @@ static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
mt6397_rtc_resume);

static const struct of_device_id mt6397_rtc_of_match[] = {
+ { .compatible = "mediatek,mt6323-rtc", },
{ .compatible = "mediatek,mt6397-rtc", },
{ }
};
@@ -349,7 +339,6 @@ static struct platform_driver mtk_rtc_driver = {
.pm = &mt6397_pm_ops,
},
.probe = mtk_rtc_probe,
- .remove = mtk_rtc_remove,
};

module_platform_driver(mtk_rtc_driver);
--
2.17.1