Merge tag 'rtc-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "The isl1208 dirver was reworked tobe able to work as part of an MFD.

  All the Loongson chips are now supported through a new driver, the old
  one is removed.

  Summary:

  Subsystem:
   - Switch i2c drivers back to use .probe()
   - Constify pointers to hwmon_channel_info

  New driver:
   - Loongson on chip RTC, replacing the Loongson 1 only driver

  Drivers:
   - isl1208: cleanup and support for RAA215300
   - st-lpc: cleanups
   - stm32: fix wakeup"

* tag 'rtc-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (21 commits)
  rtc: Add rtc driver for the Loongson family chips
  rtc: Remove the Loongson-1 RTC driver
  dt-bindings: rtc: Split loongson,ls2x-rtc into SoC-based compatibles
  rtc: rv3028: make rv3028 probeable from userspace
  rtc: isl1208: Add support for the built-in RTC on the PMIC RAA215300
  rtc: isl1208: Add isl1208_set_xtoscb()
  rtc: isl1208: Drop enum isl1208_id and split isl1208_configs[]
  rtc: isl1208: Make similar I2C and DT-based matching table
  rtc: isl1208: Drop name variable
  dt-bindings: rtc: isil,isl1208: Document clock and clock-names properties
  dt-bindings: rtc: isl1208: Convert to json-schema
  rtc: st-lpc: Simplify clk handling in st_rtc_probe()
  rtc: st-lpc: Release some resources in st_rtc_probe() in case of error
  rtc: stm32: remove dedicated wakeup management
  dt-bindings: rtc: restrict node name suffixes
  rtc: add HAS_IOPORT dependencies
  rtc: Switch i2c drivers back to use .probe()
  rtc: rv3032: constify pointers to hwmon_channel_info
  rtc: isl12022: constify pointers to hwmon_channel_info
  rtc: ds3232: constify pointers to hwmon_channel_info
  ...

41 files changed, 568 insertions, 309 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index ffca9a8bb878..05f4b2d66290 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -956,6 +956,7 @@ comment "Platform RTC drivers"
 config RTC_DRV_CMOS
 	tristate "PC-style 'CMOS'"
 	depends on X86 || ARM || PPC || MIPS || SPARC64
+	depends on HAS_IOPORT || MACH_DECSTATION
 	default y if X86
 	select RTC_MC146818_LIB
 	help
@@ -976,6 +977,7 @@ config RTC_DRV_CMOS
 config RTC_DRV_ALPHA
 	bool "Alpha PC-style CMOS"
 	depends on ALPHA
+	depends on HAS_IOPORT
 	select RTC_MC146818_LIB
 	default y
 	help
@@ -1193,7 +1195,7 @@ config RTC_DRV_MSM6242
 
 config RTC_DRV_BQ4802
 	tristate "TI BQ4802"
-	depends on HAS_IOMEM
+	depends on HAS_IOMEM && HAS_IOPORT
 	help
 	  If you say Y here you will get support for the TI
 	  BQ4802 RTC chip.
@@ -1685,6 +1687,19 @@ config RTC_DRV_JZ4740
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-jz4740.
 
+config RTC_DRV_LOONGSON
+	tristate "Loongson On-chip RTC"
+	depends on MACH_LOONGSON32 || MACH_LOONGSON64 || COMPILE_TEST
+	select REGMAP_MMIO
+	help
+	  This is a driver for the Loongson on-chip Counter0 (Time-Of-Year
+	  counter) to be used as a RTC.
+	  It can be found on Loongson-1 series cpu, Loongson-2K series cpu
+	  and Loongson LS7A bridge chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-loongson.
+
 config RTC_DRV_LPC24XX
 	tristate "NXP RTC for LPC178x/18xx/408x/43xx"
 	depends on ARCH_LPC18XX || COMPILE_TEST
@@ -1726,16 +1741,6 @@ config RTC_DRV_TEGRA
 	  This drive can also be built as a module. If so, the module
 	  will be called rtc-tegra.
 
-config RTC_DRV_LOONGSON1
-	tristate "loongson1 RTC support"
-	depends on MACH_LOONGSON32
-	help
-	  This is a driver for the loongson1 on-chip Counter0 (Time-Of-Year
-	  counter) to be used as a RTC.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called rtc-ls1x.
-
 config RTC_DRV_MXC
 	tristate "Freescale MXC Real Time Clock"
 	depends on ARCH_MXC || COMPILE_TEST
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index ea445d1ebb17..fd209883ee2e 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -78,7 +78,7 @@ obj-$(CONFIG_RTC_DRV_ISL12022)	+= rtc-isl12022.o
 obj-$(CONFIG_RTC_DRV_ISL12026)	+= rtc-isl12026.o
 obj-$(CONFIG_RTC_DRV_ISL1208)	+= rtc-isl1208.o
 obj-$(CONFIG_RTC_DRV_JZ4740)	+= rtc-jz4740.o
-obj-$(CONFIG_RTC_DRV_LOONGSON1)	+= rtc-ls1x.o
+obj-$(CONFIG_RTC_DRV_LOONGSON)	+= rtc-loongson.o
 obj-$(CONFIG_RTC_DRV_LP8788)	+= rtc-lp8788.o
 obj-$(CONFIG_RTC_DRV_LPC24XX)	+= rtc-lpc24xx.o
 obj-$(CONFIG_RTC_DRV_LPC32XX)	+= rtc-lpc32xx.o
diff --git a/drivers/rtc/rtc-ab-b5ze-s3.c b/drivers/rtc/rtc-ab-b5ze-s3.c
index f2b0971d2c65..100062001831 100644
--- a/drivers/rtc/rtc-ab-b5ze-s3.c
+++ b/drivers/rtc/rtc-ab-b5ze-s3.c
@@ -944,7 +944,7 @@ static struct i2c_driver abb5zes3_driver = {
 		.pm = &abb5zes3_rtc_pm_ops,
 		.of_match_table = of_match_ptr(abb5zes3_dt_match),
 	},
-	.probe_new = abb5zes3_probe,
+	.probe = abb5zes3_probe,
 	.id_table = abb5zes3_id,
 };
 module_i2c_driver(abb5zes3_driver);
diff --git a/drivers/rtc/rtc-ab-eoz9.c b/drivers/rtc/rtc-ab-eoz9.c
index 34611f6dedcb..04e1b8e93bc1 100644
--- a/drivers/rtc/rtc-ab-eoz9.c
+++ b/drivers/rtc/rtc-ab-eoz9.c
@@ -455,7 +455,7 @@ static const struct hwmon_channel_info abeoz9_temp = {
 	.config = abeoz9_temp_config,
 };
 
-static const struct hwmon_channel_info *abeoz9_info[] = {
+static const struct hwmon_channel_info * const abeoz9_info[] = {
 	&abeoz9_chip,
 	&abeoz9_temp,
 	NULL
@@ -584,7 +584,7 @@ static struct i2c_driver abeoz9_driver = {
 		.name = "rtc-ab-eoz9",
 		.of_match_table = of_match_ptr(abeoz9_dt_match),
 	},
-	.probe_new = abeoz9_probe,
+	.probe = abeoz9_probe,
 	.id_table = abeoz9_id,
 };
 
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index f34a2e59cac7..e08d3181bd2a 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -992,7 +992,7 @@ static struct i2c_driver abx80x_driver = {
 		.name	= "rtc-abx80x",
 		.of_match_table = of_match_ptr(abx80x_of_match),
 	},
-	.probe_new	= abx80x_probe,
+	.probe		= abx80x_probe,
 	.id_table	= abx80x_id,
 };
 
diff --git a/drivers/rtc/rtc-bq32k.c b/drivers/rtc/rtc-bq32k.c
index 967ddc6bf76d..591e42391747 100644
--- a/drivers/rtc/rtc-bq32k.c
+++ b/drivers/rtc/rtc-bq32k.c
@@ -320,7 +320,7 @@ static struct i2c_driver bq32k_driver = {
 		.name	= "bq32k",
 		.of_match_table = of_match_ptr(bq32k_of_match),
 	},
-	.probe_new	= bq32k_probe,
+	.probe		= bq32k_probe,
 	.remove		= bq32k_remove,
 	.id_table	= bq32k_id,
 };
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index e86ba84df6cb..cb5acecc11aa 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -2011,7 +2011,7 @@ static struct i2c_driver ds1307_driver = {
 		.name	= "rtc-ds1307",
 		.of_match_table = ds1307_of_match,
 	},
-	.probe_new	= ds1307_probe,
+	.probe		= ds1307_probe,
 	.id_table	= ds1307_id,
 };
 
diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 7f089f066163..4a5005cb23f5 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -572,7 +572,7 @@ static struct i2c_driver ds1374_driver = {
 		.of_match_table = of_match_ptr(ds1374_of_match),
 		.pm = &ds1374_pm,
 	},
-	.probe_new = ds1374_probe,
+	.probe = ds1374_probe,
 	.remove = ds1374_remove,
 	.id_table = ds1374_id,
 };
diff --git a/drivers/rtc/rtc-ds1672.c b/drivers/rtc/rtc-ds1672.c
index a3bb2cd9c881..641799f30baa 100644
--- a/drivers/rtc/rtc-ds1672.c
+++ b/drivers/rtc/rtc-ds1672.c
@@ -149,7 +149,7 @@ static struct i2c_driver ds1672_driver = {
 		   .name = "rtc-ds1672",
 		   .of_match_table = of_match_ptr(ds1672_of_match),
 	},
-	.probe_new = ds1672_probe,
+	.probe = ds1672_probe,
 	.id_table = ds1672_id,
 };
 
diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
index dd31a60c1fc6..89d7b085f721 100644
--- a/drivers/rtc/rtc-ds3232.c
+++ b/drivers/rtc/rtc-ds3232.c
@@ -359,7 +359,7 @@ static const struct hwmon_channel_info ds3232_hwmon_temp = {
 	.config = ds3232_hwmon_temp_config,
 };
 
-static const struct hwmon_channel_info *ds3232_hwmon_info[] = {
+static const struct hwmon_channel_info * const ds3232_hwmon_info[] = {
 	&ds3232_hwmon_chip,
 	&ds3232_hwmon_temp,
 	NULL
@@ -603,7 +603,7 @@ static struct i2c_driver ds3232_driver = {
 		.of_match_table = of_match_ptr(ds3232_of_match),
 		.pm	= &ds3232_pm_ops,
 	},
-	.probe_new = ds3232_i2c_probe,
+	.probe = ds3232_i2c_probe,
 	.id_table = ds3232_id,
 };
 
diff --git a/drivers/rtc/rtc-em3027.c b/drivers/rtc/rtc-em3027.c
index 53f9f9391a5f..fc772eae5da5 100644
--- a/drivers/rtc/rtc-em3027.c
+++ b/drivers/rtc/rtc-em3027.c
@@ -147,7 +147,7 @@ static struct i2c_driver em3027_driver = {
 		   .name = "rtc-em3027",
 		   .of_match_table = of_match_ptr(em3027_of_match),
 	},
-	.probe_new = em3027_probe,
+	.probe = em3027_probe,
 	.id_table = em3027_id,
 };
 
diff --git a/drivers/rtc/rtc-fm3130.c b/drivers/rtc/rtc-fm3130.c
index f59bb81f23c0..400ce4ad0c49 100644
--- a/drivers/rtc/rtc-fm3130.c
+++ b/drivers/rtc/rtc-fm3130.c
@@ -517,7 +517,7 @@ static struct i2c_driver fm3130_driver = {
 	.driver = {
 		.name	= "rtc-fm3130",
 	},
-	.probe_new	= fm3130_probe,
+	.probe		= fm3130_probe,
 	.id_table	= fm3130_id,
 };
 
diff --git a/drivers/rtc/rtc-hym8563.c b/drivers/rtc/rtc-hym8563.c
index 7d5a298a9a3b..b018535c842b 100644
--- a/drivers/rtc/rtc-hym8563.c
+++ b/drivers/rtc/rtc-hym8563.c
@@ -576,7 +576,7 @@ static struct i2c_driver hym8563_driver = {
 		.pm	= &hym8563_pm_ops,
 		.of_match_table	= hym8563_dt_idtable,
 	},
-	.probe_new	= hym8563_probe,
+	.probe		= hym8563_probe,
 	.id_table	= hym8563_id,
 };
 
diff --git a/drivers/rtc/rtc-isl12022.c b/drivers/rtc/rtc-isl12022.c
index e68a79b5e00e..a613257d1574 100644
--- a/drivers/rtc/rtc-isl12022.c
+++ b/drivers/rtc/rtc-isl12022.c
@@ -89,7 +89,7 @@ static int isl12022_hwmon_read(struct device *dev,
 	return -EOPNOTSUPP;
 }
 
-static const struct hwmon_channel_info *isl12022_hwmon_info[] = {
+static const struct hwmon_channel_info * const isl12022_hwmon_info[] = {
 	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
 	NULL
 };
@@ -262,7 +262,7 @@ static struct i2c_driver isl12022_driver = {
 		.name	= "rtc-isl12022",
 		.of_match_table = isl12022_dt_match,
 	},
-	.probe_new	= isl12022_probe,
+	.probe		= isl12022_probe,
 	.id_table	= isl12022_id,
 };
 
diff --git a/drivers/rtc/rtc-isl12026.c b/drivers/rtc/rtc-isl12026.c
index 1bfca39079d4..5abff5d348ac 100644
--- a/drivers/rtc/rtc-isl12026.c
+++ b/drivers/rtc/rtc-isl12026.c
@@ -490,7 +490,7 @@ static struct i2c_driver isl12026_driver = {
 		.name	= "rtc-isl12026",
 		.of_match_table = isl12026_dt_match,
 	},
-	.probe_new	= isl12026_probe_new,
+	.probe		= isl12026_probe_new,
 	.remove		= isl12026_remove,
 };
 
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 73cc6aaf9b8b..b0712b4e3648 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/bcd.h>
+#include <linux/clk.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
@@ -68,42 +69,60 @@
 
 static struct i2c_driver isl1208_driver;
 
-/* ISL1208 various variants */
-enum isl1208_id {
-	TYPE_ISL1208 = 0,
-	TYPE_ISL1209,
-	TYPE_ISL1218,
-	TYPE_ISL1219,
-	ISL_LAST_ID
-};
-
 /* Chip capabilities table */
-static const struct isl1208_config {
-	const char	name[8];
+struct isl1208_config {
 	unsigned int	nvmem_length;
 	unsigned	has_tamper:1;
 	unsigned	has_timestamp:1;
-} isl1208_configs[] = {
-	[TYPE_ISL1208] = { "isl1208", 2, false, false },
-	[TYPE_ISL1209] = { "isl1209", 2, true,  false },
-	[TYPE_ISL1218] = { "isl1218", 8, false, false },
-	[TYPE_ISL1219] = { "isl1219", 2, true,  true },
+	unsigned	has_inverted_osc_bit:1;
+};
+
+static const struct isl1208_config config_isl1208 = {
+	.nvmem_length = 2,
+	.has_tamper = false,
+	.has_timestamp = false
+};
+
+static const struct isl1208_config config_isl1209 = {
+	.nvmem_length = 2,
+	.has_tamper = true,
+	.has_timestamp = false
+};
+
+static const struct isl1208_config config_isl1218 = {
+	.nvmem_length = 8,
+	.has_tamper = false,
+	.has_timestamp = false
+};
+
+static const struct isl1208_config config_isl1219 = {
+	.nvmem_length = 2,
+	.has_tamper = true,
+	.has_timestamp = true
+};
+
+static const struct isl1208_config config_raa215300_a0 = {
+	.nvmem_length = 2,
+	.has_tamper = false,
+	.has_timestamp = false,
+	.has_inverted_osc_bit = true
 };
 
 static const struct i2c_device_id isl1208_id[] = {
-	{ "isl1208", TYPE_ISL1208 },
-	{ "isl1209", TYPE_ISL1209 },
-	{ "isl1218", TYPE_ISL1218 },
-	{ "isl1219", TYPE_ISL1219 },
+	{ "isl1208", .driver_data = (kernel_ulong_t)&config_isl1208 },
+	{ "isl1209", .driver_data = (kernel_ulong_t)&config_isl1209 },
+	{ "isl1218", .driver_data = (kernel_ulong_t)&config_isl1218 },
+	{ "isl1219", .driver_data = (kernel_ulong_t)&config_isl1219 },
+	{ "raa215300_a0", .driver_data = (kernel_ulong_t)&config_raa215300_a0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, isl1208_id);
 
 static const __maybe_unused struct of_device_id isl1208_of_match[] = {
-	{ .compatible = "isil,isl1208", .data = &isl1208_configs[TYPE_ISL1208] },
-	{ .compatible = "isil,isl1209", .data = &isl1208_configs[TYPE_ISL1209] },
-	{ .compatible = "isil,isl1218", .data = &isl1208_configs[TYPE_ISL1218] },
-	{ .compatible = "isil,isl1219", .data = &isl1208_configs[TYPE_ISL1219] },
+	{ .compatible = "isil,isl1208", .data = &config_isl1208 },
+	{ .compatible = "isil,isl1209", .data = &config_isl1209 },
+	{ .compatible = "isil,isl1218", .data = &config_isl1218 },
+	{ .compatible = "isil,isl1219", .data = &config_isl1219 },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, isl1208_of_match);
@@ -166,6 +185,20 @@ isl1208_i2c_validate_client(struct i2c_client *client)
 	return 0;
 }
 
+static int isl1208_set_xtoscb(struct i2c_client *client, int sr, int xtosb_val)
+{
+	/* Do nothing if bit is already set to desired value */
+	if ((sr & ISL1208_REG_SR_XTOSCB) == xtosb_val)
+		return 0;
+
+	if (xtosb_val)
+		sr |= ISL1208_REG_SR_XTOSCB;
+	else
+		sr &= ~ISL1208_REG_SR_XTOSCB;
+
+	return i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
+}
+
 static int
 isl1208_i2c_get_sr(struct i2c_client *client)
 {
@@ -502,7 +535,6 @@ isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
 	return 0;
 }
 
-
 static int
 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
@@ -797,11 +829,25 @@ static int isl1208_setup_irq(struct i2c_client *client, int irq)
 }
 
 static int
+isl1208_clk_present(struct i2c_client *client, const char *name)
+{
+	struct clk *clk;
+
+	clk = devm_clk_get_optional(&client->dev, name);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	return !!clk;
+}
+
+static int
 isl1208_probe(struct i2c_client *client)
 {
-	int rc = 0;
 	struct isl1208_state *isl1208;
 	int evdet_irq = -1;
+	int xtosb_val = 0;
+	int rc = 0;
+	int sr;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
@@ -823,9 +869,22 @@ isl1208_probe(struct i2c_client *client)
 	} else {
 		const struct i2c_device_id *id = i2c_match_id(isl1208_id, client);
 
-		if (id->driver_data >= ISL_LAST_ID)
+		if (!id)
 			return -ENODEV;
-		isl1208->config = &isl1208_configs[id->driver_data];
+		isl1208->config = (struct isl1208_config *)id->driver_data;
+	}
+
+	rc = isl1208_clk_present(client, "xin");
+	if (rc < 0)
+		return rc;
+
+	if (!rc) {
+		rc = isl1208_clk_present(client, "clkin");
+		if (rc < 0)
+			return rc;
+
+		if (rc)
+			xtosb_val = 1;
 	}
 
 	isl1208->rtc = devm_rtc_allocate_device(&client->dev);
@@ -839,13 +898,20 @@ isl1208_probe(struct i2c_client *client)
 	isl1208->nvmem_config.size = isl1208->config->nvmem_length;
 	isl1208->nvmem_config.priv = isl1208;
 
-	rc = isl1208_i2c_get_sr(client);
-	if (rc < 0) {
+	sr = isl1208_i2c_get_sr(client);
+	if (sr < 0) {
 		dev_err(&client->dev, "reading status failed\n");
-		return rc;
+		return sr;
 	}
 
-	if (rc & ISL1208_REG_SR_RTCF)
+	if (isl1208->config->has_inverted_osc_bit)
+		xtosb_val = !xtosb_val;
+
+	rc = isl1208_set_xtoscb(client, sr, xtosb_val);
+	if (rc)
+		return rc;
+
+	if (sr & ISL1208_REG_SR_RTCF)
 		dev_warn(&client->dev, "rtc power failure detected, "
 			 "please set clock.\n");
 
@@ -908,7 +974,7 @@ static struct i2c_driver isl1208_driver = {
 		.name = "rtc-isl1208",
 		.of_match_table = of_match_ptr(isl1208_of_match),
 	},
-	.probe_new = isl1208_probe,
+	.probe = isl1208_probe,
 	.id_table = isl1208_id,
 };
 
diff --git a/drivers/rtc/rtc-loongson.c b/drivers/rtc/rtc-loongson.c
new file mode 100644
index 000000000000..e8ffc1ab90b0
--- /dev/null
+++ b/drivers/rtc/rtc-loongson.c
@@ -0,0 +1,397 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Loongson RTC driver
+ *
+ * Maintained out-of-tree by Huacai Chen <chenhuacai@kernel.org>.
+ * Rewritten for mainline by WANG Xuerui <git@xen0n.name>.
+ *                           Binbin Zhou <zhoubinbin@loongson.cn>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/rtc.h>
+#include <linux/acpi.h>
+
+/* Time Of Year(TOY) counters registers */
+#define TOY_TRIM_REG		0x20 /* Must be initialized to 0 */
+#define TOY_WRITE0_REG		0x24 /* TOY low 32-bits value (write-only) */
+#define TOY_WRITE1_REG		0x28 /* TOY high 32-bits value (write-only) */
+#define TOY_READ0_REG		0x2c /* TOY low 32-bits value (read-only) */
+#define TOY_READ1_REG		0x30 /* TOY high 32-bits value (read-only) */
+#define TOY_MATCH0_REG		0x34 /* TOY timing interrupt 0 */
+#define TOY_MATCH1_REG		0x38 /* TOY timing interrupt 1 */
+#define TOY_MATCH2_REG		0x3c /* TOY timing interrupt 2 */
+
+/* RTC counters registers */
+#define RTC_CTRL_REG		0x40 /* TOY and RTC control register */
+#define RTC_TRIM_REG		0x60 /* Must be initialized to 0 */
+#define RTC_WRITE0_REG		0x64 /* RTC counters value (write-only) */
+#define RTC_READ0_REG		0x68 /* RTC counters value (read-only) */
+#define RTC_MATCH0_REG		0x6c /* RTC timing interrupt 0 */
+#define RTC_MATCH1_REG		0x70 /* RTC timing interrupt 1 */
+#define RTC_MATCH2_REG		0x74 /* RTC timing interrupt 2 */
+
+/* bitmask of TOY_WRITE0_REG */
+#define TOY_MON			GENMASK(31, 26)
+#define TOY_DAY			GENMASK(25, 21)
+#define TOY_HOUR		GENMASK(20, 16)
+#define TOY_MIN			GENMASK(15, 10)
+#define TOY_SEC			GENMASK(9, 4)
+#define TOY_MSEC		GENMASK(3, 0)
+
+/* bitmask of TOY_MATCH0/1/2_REG */
+#define TOY_MATCH_YEAR		GENMASK(31, 26)
+#define TOY_MATCH_MON		GENMASK(25, 22)
+#define TOY_MATCH_DAY		GENMASK(21, 17)
+#define TOY_MATCH_HOUR		GENMASK(16, 12)
+#define TOY_MATCH_MIN		GENMASK(11, 6)
+#define TOY_MATCH_SEC		GENMASK(5, 0)
+
+/* bitmask of RTC_CTRL_REG */
+#define RTC_ENABLE		BIT(13) /* 1: RTC counters enable */
+#define TOY_ENABLE		BIT(11) /* 1: TOY counters enable */
+#define OSC_ENABLE		BIT(8) /* 1: 32.768k crystal enable */
+#define TOY_ENABLE_MASK		(TOY_ENABLE | OSC_ENABLE)
+
+/* PM domain registers */
+#define PM1_STS_REG		0x0c	/* Power management 1 status register */
+#define RTC_STS			BIT(10)	/* RTC status */
+#define PM1_EN_REG		0x10	/* Power management 1 enable register */
+#define RTC_EN			BIT(10)	/* RTC event enable */
+
+/*
+ * According to the LS1C manual, RTC_CTRL and alarm-related registers are not defined.
+ * Accessing the relevant registers will cause the system to hang.
+ */
+#define LS1C_RTC_CTRL_WORKAROUND	BIT(0)
+
+struct loongson_rtc_config {
+	u32 pm_offset;	/* Offset of PM domain, for RTC alarm wakeup */
+	u32 flags;	/* Workaround bits */
+};
+
+struct loongson_rtc_priv {
+	spinlock_t lock;	/* protects PM registers access */
+	u32 fix_year;		/* RTC alarm year compensation value */
+	struct rtc_device *rtcdev;
+	struct regmap *regmap;
+	void __iomem *pm_base;	/* PM domain base, for RTC alarm wakeup */
+	const struct loongson_rtc_config *config;
+};
+
+static const struct loongson_rtc_config ls1b_rtc_config = {
+	.pm_offset = 0,
+	.flags = 0,
+};
+
+static const struct loongson_rtc_config ls1c_rtc_config = {
+	.pm_offset = 0,
+	.flags = LS1C_RTC_CTRL_WORKAROUND,
+};
+
+static const struct loongson_rtc_config generic_rtc_config = {
+	.pm_offset = 0x100,
+	.flags = 0,
+};
+
+static const struct loongson_rtc_config ls2k1000_rtc_config = {
+	.pm_offset = 0x800,
+	.flags = 0,
+};
+
+static const struct regmap_config loongson_rtc_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+/* RTC alarm irq handler */
+static irqreturn_t loongson_rtc_isr(int irq, void *id)
+{
+	struct loongson_rtc_priv *priv = (struct loongson_rtc_priv *)id;
+
+	rtc_update_irq(priv->rtcdev, 1, RTC_AF | RTC_IRQF);
+	return IRQ_HANDLED;
+}
+
+/* For ACPI fixed event handler */
+static u32 loongson_rtc_handler(void *id)
+{
+	struct loongson_rtc_priv *priv = (struct loongson_rtc_priv *)id;
+
+	spin_lock(&priv->lock);
+	/* Disable RTC alarm wakeup and interrupt */
+	writel(readl(priv->pm_base + PM1_EN_REG) & ~RTC_EN,
+	       priv->pm_base + PM1_EN_REG);
+
+	/* Clear RTC interrupt status */
+	writel(RTC_STS, priv->pm_base + PM1_STS_REG);
+	spin_unlock(&priv->lock);
+
+	/*
+	 * The TOY_MATCH0_REG should be cleared 0 here,
+	 * otherwise the interrupt cannot be cleared.
+	 */
+	return regmap_write(priv->regmap, TOY_MATCH0_REG, 0);
+}
+
+static int loongson_rtc_set_enabled(struct device *dev)
+{
+	struct loongson_rtc_priv *priv = dev_get_drvdata(dev);
+
+	if (priv->config->flags & LS1C_RTC_CTRL_WORKAROUND)
+		return 0;
+
+	/* Enable RTC TOY counters and crystal */
+	return regmap_update_bits(priv->regmap, RTC_CTRL_REG, TOY_ENABLE_MASK,
+				  TOY_ENABLE_MASK);
+}