linux-kernel - [PATCH v4 04/10] rtc: mt6397: improvements of rtc driver

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Message-Id: <20190806162745.8414-5-frank-w@public-files.de>
Date:   Tue,  6 Aug 2019 18:27:39 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Allison Randal <allison@...utok.net>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Eddie Huang <eddie.huang@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-rtc@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Richard Fontana <rfontana@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Sebastian Reichel <sre@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Tianping . Fang" <tianping.fang@...iatek.com>
Cc:     Josef Friedl <josef.friedl@...ed.at>,
        Frank Wunderlich <frank-w@...lic-files.de>
Subject: [PATCH v4 04/10] rtc: mt6397: improvements of rtc driver

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

- use regmap_read_poll_timeout to drop while-loop
- use devm-api to drop remove-callback

Suggested-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Signed-off-by: Josef Friedl <josef.friedl@...ed.at>
Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
---
changes since v3: none
changes since v2:
- fix allocation after irq-request
- compatible for mt6323 in separate commit => part 5

 drivers/rtc/rtc-mt6397.c | 51 +++++++++++++++-------------------------
 1 file changed, 19 insertions(+), 32 deletions(-)

diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index c08ee5edf865..9370b7fc9f81 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -4,16 +4,19 @@
 * Author: Tianping.Fang <tianping.fang@...iatek.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;
 }
@@ -266,19 +263,19 @@ static int mtk_rtc_probe(struct platform_device *pdev)
 		return rtc->irq;

 	rtc->regmap = mt6397_chip->regmap;
-	rtc->dev = &pdev->dev;
 	mutex_init(&rtc->lock);

 	platform_set_drvdata(pdev, rtc);

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

-	ret = request_threaded_irq(rtc->irq, NULL,
-				   mtk_rtc_irq_handler_thread,
-				   IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
-				   "mt6397-rtc", rtc);
+	ret = devm_request_threaded_irq(&pdev->dev, 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);
@@ -302,15 +299,6 @@ 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)
 {
@@ -349,7 +337,6 @@ 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