add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-sh.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * SuperH On-Chip RTC Support
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  *
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@@ -9,10 +10,6 @@
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  *
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  *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
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  *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
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- *
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- * This file is subject to the terms and conditions of the GNU General Public
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- * License.  See the file "COPYING" in the main directory of this archive
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- * for more details.
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  */
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 #include <linux/module.h>
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 #include <linux/mod_devicetable.h>
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@@ -279,6 +276,9 @@
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 	struct sh_rtc *rtc = dev_get_drvdata(dev);
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 	unsigned int sec128, sec2, yr, yr100, cf_bit;
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+	if (!(readb(rtc->regbase + RCR2) & RCR2_RTCEN))
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+		return -EINVAL;
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+
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 	do {
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 		unsigned int tmp;
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@@ -469,7 +469,6 @@
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 {
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 	struct sh_rtc *rtc;
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 	struct resource *res;
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-	struct rtc_time r;
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 	char clk_name[6];
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 	int clk_id, ret;
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@@ -505,8 +504,7 @@
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 	if (unlikely(!rtc->res))
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 		return -EBUSY;
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-	rtc->regbase = devm_ioremap_nocache(&pdev->dev, rtc->res->start,
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-					rtc->regsize);
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+	rtc->regbase = devm_ioremap(&pdev->dev, rtc->res->start, rtc->regsize);
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 	if (unlikely(!rtc->regbase))
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 		return -EINVAL;
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@@ -530,6 +528,10 @@
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 		 */
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 		rtc->clk = NULL;
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 	}
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+
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+	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
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+	if (IS_ERR(rtc->rtc_dev))
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+		return PTR_ERR(rtc->rtc_dev);
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 	clk_enable(rtc->clk);
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@@ -594,20 +596,20 @@
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 	sh_rtc_setaie(&pdev->dev, 0);
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 	sh_rtc_setcie(&pdev->dev, 0);
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-	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "sh",
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-					   &sh_rtc_ops, THIS_MODULE);
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-	if (IS_ERR(rtc->rtc_dev)) {
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-		ret = PTR_ERR(rtc->rtc_dev);
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-		goto err_unmap;
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-	}
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-
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+	rtc->rtc_dev->ops = &sh_rtc_ops;
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 	rtc->rtc_dev->max_user_freq = 256;
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-	/* reset rtc to epoch 0 if time is invalid */
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-	if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
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-		rtc_time_to_tm(0, &r);
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-		rtc_set_time(rtc->rtc_dev, &r);
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+	if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) {
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+		rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900;
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+		rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_9999;
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+	} else {
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+		rtc->rtc_dev->range_min = mktime64(1999, 1, 1, 0, 0, 0);
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+		rtc->rtc_dev->range_max = mktime64(2098, 12, 31, 23, 59, 59);
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 	}
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+
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+	ret = rtc_register_device(rtc->rtc_dev);
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+	if (ret)
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+		goto err_unmap;
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 	device_init_wakeup(&pdev->dev, 1);
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 	return 0;
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@@ -681,5 +683,5 @@
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 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, "
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 	      "Jamie Lenehan <lenehan@twibble.org>, "
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 	      "Angelo Castello <angelo.castello@st.com>");
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-MODULE_LICENSE("GPL");
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+MODULE_LICENSE("GPL v2");
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 MODULE_ALIAS("platform:" DRV_NAME);