add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-vt8500.c
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@@ -1,18 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * drivers/rtc/rtc-vt8500.c
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  *
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  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
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  *
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  * Based on rtc-pxa.c
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- *
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- * This software is licensed under the terms of the GNU General Public
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- * License version 2, as published by the Free Software Foundation, and
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- * may be copied, distributed, and modified under those terms.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  */
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9
 
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 #include <linux/module.h>
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@@ -130,12 +122,6 @@
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 {
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 	struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
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124
 
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-	if (tm->tm_year < 100) {
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-		dev_warn(dev, "Only years 2000-2199 are supported by the "
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-			      "hardware!\n");
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-		return -EINVAL;
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-	}
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-
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 	writel((bin2bcd(tm->tm_year % 100) << DATE_YEAR_S)
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 		| (bin2bcd(tm->tm_mon + 1) << DATE_MONTH_S)
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 		| (bin2bcd(tm->tm_mday))
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@@ -208,7 +194,6 @@
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 static int vt8500_rtc_probe(struct platform_device *pdev)
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 {
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 	struct vt8500_rtc *vt8500_rtc;
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-	struct resource	*res;
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 	int ret;
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 	vt8500_rtc = devm_kzalloc(&pdev->dev,
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@@ -220,13 +205,10 @@
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 	platform_set_drvdata(pdev, vt8500_rtc);
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 	vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0);
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-	if (vt8500_rtc->irq_alarm < 0) {
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-		dev_err(&pdev->dev, "No alarm IRQ resource defined\n");
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+	if (vt8500_rtc->irq_alarm < 0)
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 		return vt8500_rtc->irq_alarm;
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-	}
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-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	vt8500_rtc->regbase = devm_ioremap_resource(&pdev->dev, res);
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+	vt8500_rtc->regbase = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(vt8500_rtc->regbase))
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 		return PTR_ERR(vt8500_rtc->regbase);
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@@ -234,27 +216,23 @@
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 	writel(VT8500_RTC_CR_ENABLE,
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 	       vt8500_rtc->regbase + VT8500_RTC_CR);
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-	vt8500_rtc->rtc = devm_rtc_device_register(&pdev->dev, "vt8500-rtc",
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-					      &vt8500_rtc_ops, THIS_MODULE);
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-	if (IS_ERR(vt8500_rtc->rtc)) {
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-		ret = PTR_ERR(vt8500_rtc->rtc);
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-		dev_err(&pdev->dev,
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-			"Failed to register RTC device -> %d\n", ret);
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-		goto err_return;
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-	}
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+	vt8500_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
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+	if (IS_ERR(vt8500_rtc->rtc))
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+		return PTR_ERR(vt8500_rtc->rtc);
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+
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+	vt8500_rtc->rtc->ops = &vt8500_rtc_ops;
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+	vt8500_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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+	vt8500_rtc->rtc->range_max = RTC_TIMESTAMP_END_2199;
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 	ret = devm_request_irq(&pdev->dev, vt8500_rtc->irq_alarm,
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 				vt8500_rtc_irq, 0, "rtc alarm", vt8500_rtc);
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 	if (ret < 0) {
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 		dev_err(&pdev->dev, "can't get irq %i, err %d\n",
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 			vt8500_rtc->irq_alarm, ret);
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-		goto err_return;
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+		return ret;
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 	}
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-	return 0;
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-
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-err_return:
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-	return ret;
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+	return rtc_register_device(vt8500_rtc->rtc);
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 }
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 static int vt8500_rtc_remove(struct platform_device *pdev)