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

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Message-Id: <20190703164822.17924-4-frank-w@public-files.de>
Date:   Wed,  3 Jul 2019 18:48:18 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Sebastian Reichel <sre@...nel.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-rtc@...r.kernel.org,
        Eddie Huang <eddie.huang@...iatek.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Richard Fontana <rfontana@...hat.com>,
        Allison Randal <allison@...utok.net>,
        "David S . Miller" <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>
Cc:     Josef Friedl <josef.friedl@...ed.at>,
        Frank Wunderlich <frank-w@...lic-files.de>
Subject: [PATCH v2 3/7] 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
- add new compatible for mt6323

Signed-off-by: Frank Wunderlich <frank-w@...lic-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@...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;
 }
@@ -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