add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-pcf8523.c
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@@ -1,9 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2012 Avionic Design GmbH
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/bcd.h>
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@@ -37,10 +34,6 @@
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 #define REG_OFFSET   0x0e
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 #define REG_OFFSET_MODE BIT(7)
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-
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-struct pcf8523 {
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-	struct rtc_device *rtc;
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-};
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 static int pcf8523_read(struct i2c_client *client, u8 reg, u8 *valuep)
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 {
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@@ -115,7 +108,7 @@
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 	default:
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 		dev_warn(&client->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 12500",
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 			 load);
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-		/* fall through */
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+		fallthrough;
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 	case 12500:
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 		value |= REG_CONTROL1_CAP_SEL;
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 		break;
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@@ -289,11 +282,11 @@
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 		ret = pcf8523_voltage_low(client);
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 		if (ret < 0)
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 			return ret;
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+		if (ret)
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+			ret = RTC_VL_BACKUP_LOW;
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-		if (copy_to_user((void __user *)arg, &ret, sizeof(int)))
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-			return -EFAULT;
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+		return put_user(ret, (unsigned int __user *)arg);
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-		return 0;
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 	default:
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 		return -ENOIOCTLCMD;
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 	}
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@@ -348,15 +341,11 @@
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 static int pcf8523_probe(struct i2c_client *client,
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 			 const struct i2c_device_id *id)
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 {
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-	struct pcf8523 *pcf;
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+	struct rtc_device *rtc;
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 	int err;
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 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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 		return -ENODEV;
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-
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-	pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL);
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-	if (!pcf)
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-		return -ENOMEM;
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 	err = pcf8523_load_capacitance(client);
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 	if (err < 0)
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@@ -367,12 +356,10 @@
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 	if (err < 0)
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 		return err;
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-	pcf->rtc = devm_rtc_device_register(&client->dev, DRIVER_NAME,
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+	rtc = devm_rtc_device_register(&client->dev, DRIVER_NAME,
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 				       &pcf8523_rtc_ops, THIS_MODULE);
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-	if (IS_ERR(pcf->rtc))
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-		return PTR_ERR(pcf->rtc);
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-
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-	i2c_set_clientdata(client, pcf);
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+	if (IS_ERR(rtc))
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+		return PTR_ERR(rtc);
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 	return 0;
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 }
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@@ -386,6 +373,7 @@
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 #ifdef CONFIG_OF
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 static const struct of_device_id pcf8523_of_match[] = {
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 	{ .compatible = "nxp,pcf8523" },
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+	{ .compatible = "microcrystal,rv8523" },
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 	{ }
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 };
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 MODULE_DEVICE_TABLE(of, pcf8523_of_match);