[PATCH v3 0/8] rtc: abx80x: add support for abx81x

[PATCH v3 0/8] rtc: abx80x: add support for abx81x

[Antoni Pokusinski]

Hello,
This patch series adds support for the ABX81X RTCs, which are essentially
SPI versions of the ABX80X RTCs. The first patches (P2-P3) contain bug fixes 
(added after sashiko's review in v1 and v2), then (P4-P7) we have some cleanup and
reorganization changes (converting the driver to use the regmap API was
needed for this), followed by the actual ABX81X support.

Kind regards,
Antoni Pokusinski

---
Chnges since v2:
* dropped patch "rtc: abx80x: move part autodetection before RV1805 configuration"
* PATCH 2 ("rtc: abx80x: add mutex protection for register writes")
  New patch
* PATCH 5 ("rtc: abx80x: use regmap instead of I2C specific API")
  - return PTR_ERR(regmap) on I2C regmap init error
* PATCH 8 ("rtc: abx80x: add support for ABX81X")
  - return PTR_ERR(regmap) on SPI regmap init error
---
Changes since v1:
* PATCH 1 ("dt-bindings: rtc: abx80x: document ABX81X RTCs")
  - added missing "spi-peripherals-props" reference
  - added abx815 compatible strings to the trickle charger enum list
* PATCH 2 ("rtc: abx80x: move part autodetection before RV1805 configuration")
  New patch
* PATCH 3 ("rtc: abx80x: properly handle shared IRQs")
  New patch
* PATCH 5 ("rtc: abx80x: use regmap instead of I2C specific API")
  - changed regmap_read() argument types from `int` to `unsigned int`
---


Antoni Pokusinski (8):
  dt-bindings: rtc: abx80x: document ABX81X RTCs
  rtc: abx80x: add mutex protection for register writes
  rtc: abx80x: properly handle shared IRQs
  rtc: abx80x: add irq to struct abx80x_priv
  rtc: abx80x: use regmap instead of I2C specific API
  rtc: abx80x: replace read-modify-write pattern with regmap helpers
  rtc: abx80x: create abx80x_i2c_probe()
  rtc: abx80x: add support for ABX81X

 .../bindings/rtc/abracon,abx80x.yaml          |  18 +-
 drivers/rtc/Kconfig                           |  25 +-
 drivers/rtc/rtc-abx80x.c                      | 639 +++++++++++-------
 3 files changed, 427 insertions(+), 255 deletions(-)

-- 
2.55.0

[PATCH v3 1/8] dt-bindings: rtc: abx80x: document ABX81X RTCs

[Antoni Pokusinski]

Abracon AB0815 and AB1815 are RTC modules with SPI interface.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 .../bindings/rtc/abracon,abx80x.yaml           | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/rtc/abracon,abx80x.yaml b/Documentation/devicetree/bindings/rtc/abracon,abx80x.yaml
index 355b0598411a..d105570bcd5a 100644
--- a/Documentation/devicetree/bindings/rtc/abracon,abx80x.yaml
+++ b/Documentation/devicetree/bindings/rtc/abracon,abx80x.yaml
@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/rtc/abracon,abx80x.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Abracon ABX80X I2C ultra low power RTC/Alarm chip
+title: Abracon ABX80X (I2C) and ABX81X (SPI) ultra low power RTC/Alarm chips
 
 maintainers:
   - linux-rtc@vger.kernel.org
@@ -21,10 +21,12 @@ properties:
       - abracon,ab0803
       - abracon,ab0804
       - abracon,ab0805
+      - abracon,ab0815
       - abracon,ab1801
       - abracon,ab1803
       - abracon,ab1804
       - abracon,ab1805
+      - abracon,ab1815
       - microcrystal,rv1805
 
   reg:
@@ -61,6 +63,7 @@ required:
   - reg
 
 allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
   - $ref: rtc.yaml#
   - if:
       properties:
@@ -73,6 +76,8 @@ allOf:
                 - abracon,ab1804
                 - abracon,ab0805
                 - abracon,ab1805
+                - abracon,ab0815
+                - abracon,ab1815
     then:
       properties:
         abracon,tc-diode: false
@@ -96,3 +101,14 @@ examples:
             interrupts = <44 IRQ_TYPE_EDGE_FALLING>;
         };
     };
+
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rtc@0 {
+            compatible = "abracon,ab1815";
+            reg = <0>;
+        };
+    };
-- 
2.55.0

[PATCH v3 2/8] rtc: abx80x: add mutex protection for register writes

[Antoni Pokusinski]

The ABX80X RTC driver performs multi-step register operations such as
NVMEM transfers or register writes preceded by a configuration key
write. Add a mutex to serialize all the register writes to protect
these sequences against race conditions.

Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 drivers/rtc/rtc-abx80x.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 5486d9d0b1e5..8d791b9ec7d2 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -15,6 +15,7 @@
 #include <linux/i2c.h>
 #include <linux/kstrtox.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/rtc.h>
 #include <linux/watchdog.h>
@@ -127,6 +128,7 @@ struct abx80x_priv {
 	struct rtc_device *rtc;
 	struct i2c_client *client;
 	struct watchdog_device wdog;
+	struct mutex lock;
 };
 
 static int abx80x_write_config_key(struct i2c_client *client, u8 key)
@@ -219,6 +221,7 @@ static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	unsigned char buf[8];
 	int err, flags;
 
@@ -234,6 +237,8 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
 	buf[ABX8XX_REG_WD] = tm->tm_wday;
 
+	guard(mutex)(&priv->lock);
+
 	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
 					     sizeof(buf), buf);
 	if (err < 0) {
@@ -263,6 +268,8 @@ static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
 	struct rtc_device *rtc = priv->rtc;
 	int status;
 
+	guard(mutex)(&priv->lock);
+
 	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
 	if (status < 0)
 		return IRQ_NONE;
@@ -317,6 +324,7 @@ static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	u8 alarm[6];
 	int err;
 
@@ -330,6 +338,8 @@ static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	alarm[4] = bin2bcd(t->time.tm_mday);
 	alarm[5] = bin2bcd(t->time.tm_mon + 1);
 
+	guard(mutex)(&priv->lock);
+
 	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
 					     sizeof(alarm), alarm);
 	if (err < 0) {
@@ -352,6 +362,7 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 					  int autocalibration)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	int retval, flags = 0;
 
 	if ((autocalibration != 0) && (autocalibration != 1024) &&
@@ -360,6 +371,8 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 		return -EINVAL;
 	}
 
+	guard(mutex)(&priv->lock);
+
 	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
 	if (flags < 0)
 		return flags;
@@ -443,6 +456,7 @@ static ssize_t oscillator_store(struct device *dev,
 				const char *buf, size_t count)
 {
 	struct i2c_client *client = to_i2c_client(dev->parent);
+	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	int retval, flags, rc_mode = 0;
 
 	if (strncmp(buf, "rc", 2) == 0) {
@@ -454,6 +468,8 @@ static ssize_t oscillator_store(struct device *dev,
 		return -EINVAL;
 	}
 
+	guard(mutex)(&priv->lock);
+
 	flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
 	if (flags < 0)
 		return flags;
@@ -511,8 +527,11 @@ static const struct attribute_group rtc_calib_attr_group = {
 static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	int err;
 
+	guard(mutex)(&priv->lock);
+
 	if (enabled)
 		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
 						(ABX8XX_IRQ_IM_1_4 |
@@ -526,6 +545,7 @@ static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
 static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	int status, tmp;
 
 	switch (cmd) {
@@ -539,6 +559,8 @@ static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 		return put_user(tmp, (unsigned int __user *)arg);
 
 	case RTC_VL_CLR:
+		guard(mutex)(&priv->lock);
+
 		status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
 		if (status < 0)
 			return status;
@@ -617,6 +639,8 @@ static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog,
 	struct abx80x_priv *priv = watchdog_get_drvdata(wdog);
 	u8 val = ABX8XX_WDT_WDS | timeout_bits(timeout);
 
+	guard(mutex)(&priv->lock);
+
 	/*
 	 * Writing any timeout to the WDT register resets the watchdog timer.
 	 * Writing 0 disables it.
@@ -701,6 +725,8 @@ static int abx80x_nvmem_xfer(struct abx80x_priv *priv, unsigned int offset,
 		len = min(lower + bytes, (size_t)ABX8XX_SRAM_WIN_SIZE) - lower;
 		len = min_t(u8, len, I2C_SMBUS_BLOCK_MAX);
 
+		guard(mutex)(&priv->lock);
+
 		ret = i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_EXTRAM,
 						extram);
 		if (ret)
@@ -908,6 +934,9 @@ static int abx80x_probe(struct i2c_client *client)
 
 	priv->rtc->ops = &abx80x_rtc_ops;
 	priv->client = client;
+	err = devm_mutex_init(&client->dev, &priv->lock);
+	if (err)
+		return err;
 
 	i2c_set_clientdata(client, priv);
 
-- 
2.55.0

[PATCH v3 3/8] rtc: abx80x: properly handle shared IRQs

[Antoni Pokusinski]

The abx80x RTC driver registers its interrupt handler with IRQF_SHARED,
but the handler always returned IRQ_HANDLED and cleared the status
register even when no interrupt source from the RTC was active.

This could cause the driver to claim interrupts belonging to other
devices sharing the same IRQ line and could also clear unrelated status
bits in the RTC status register.

Only handle the interrupt when the alarm or watchdog flags are set, and
clear only those interrupt status bits that were handled. Return
IRQ_NONE when the interrupt was not generated by the RTC.

Fixes: 718a820a303c ("rtc: abx80x: add alarm support")
Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 drivers/rtc/rtc-abx80x.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 8d791b9ec7d2..b84fce0ef294 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -266,27 +266,34 @@ static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
 	struct i2c_client *client = dev_id;
 	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	struct rtc_device *rtc = priv->rtc;
+	irqreturn_t handled = IRQ_NONE;
 	int status;
 
 	guard(mutex)(&priv->lock);
 
 	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
 	if (status < 0)
-		return IRQ_NONE;
+		return handled;
 
-	if (status & ABX8XX_STATUS_AF)
+	if (status & ABX8XX_STATUS_AF) {
 		rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
+		handled = IRQ_HANDLED;
+	}
 
 	/*
 	 * It is unclear if we'll get an interrupt before the external
 	 * reset kicks in.
 	 */
-	if (status & ABX8XX_STATUS_WDT)
+	if (status & ABX8XX_STATUS_WDT) {
 		dev_alert(&client->dev, "watchdog timeout interrupt.\n");
+		handled = IRQ_HANDLED;
+	}
 
-	i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
+	if (handled == IRQ_HANDLED)
+		i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS,
+					  status & ~(ABX8XX_STATUS_AF | ABX8XX_STATUS_WDT));
 
-	return IRQ_HANDLED;
+	return handled;
 }
 
 static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
-- 
2.55.0

[PATCH v3 4/8] rtc: abx80x: add irq to struct abx80x_priv

[Antoni Pokusinski]

This way the irq number is not tied to the i2c_client and can be
easily accessed also in the case of ABX81X SPI clocks.

Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 drivers/rtc/rtc-abx80x.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index b84fce0ef294..4ac3ace687a1 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -129,6 +129,7 @@ struct abx80x_priv {
 	struct i2c_client *client;
 	struct watchdog_device wdog;
 	struct mutex lock;
+	int irq;
 };
 
 static int abx80x_write_config_key(struct i2c_client *client, u8 key)
@@ -299,11 +300,12 @@ static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
 static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct abx80x_priv *priv = i2c_get_clientdata(client);
 	unsigned char buf[7];
 
 	int irq_mask, err;
 
-	if (client->irq <= 0)
+	if (priv->irq <= 0)
 		return -EINVAL;
 
 	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
@@ -335,7 +337,7 @@ static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 	u8 alarm[6];
 	int err;
 
-	if (client->irq <= 0)
+	if (priv->irq <= 0)
 		return -EINVAL;
 
 	alarm[0] = 0x0;
@@ -941,6 +943,7 @@ static int abx80x_probe(struct i2c_client *client)
 
 	priv->rtc->ops = &abx80x_rtc_ops;
 	priv->client = client;
+	priv->irq = client->irq;
 	err = devm_mutex_init(&client->dev, &priv->lock);
 	if (err)
 		return err;
@@ -957,19 +960,19 @@ static int abx80x_probe(struct i2c_client *client)
 	if (err)
 		return err;
 
-	if (client->irq > 0) {
-		dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
-		err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+	if (priv->irq > 0) {
+		dev_info(&client->dev, "IRQ %d supplied\n", priv->irq);
+		err = devm_request_threaded_irq(&client->dev, priv->irq, NULL,
 						abx80x_handle_irq,
 						IRQF_SHARED | IRQF_ONESHOT,
 						"abx8xx",
 						client);
 		if (err) {
 			dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
-			client->irq = 0;
+			priv->irq = 0;
 		}
 	}
-	if (client->irq <= 0)
+	if (priv->irq <= 0)
 		clear_bit(RTC_FEATURE_ALARM, priv->rtc->features);
 
 	err = rtc_add_group(priv->rtc, &rtc_calib_attr_group);
-- 
2.55.0

[PATCH v3 5/8] rtc: abx80x: use regmap instead of I2C specific API

[Antoni Pokusinski]

Rework the driver so that it uses regmap_* functions for communication
with the device instead of the i2c_smbus_* API. This way the support for
ABX81X RTCs which use SPI can be added later.

Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 drivers/rtc/Kconfig      |   1 +
 drivers/rtc/rtc-abx80x.c | 354 +++++++++++++++++++++------------------
 2 files changed, 192 insertions(+), 163 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 01def8231873..4d14bcba616e 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -215,6 +215,7 @@ config RTC_DRV_ABEOZ9
 config RTC_DRV_ABX80X
 	tristate "Abracon ABx80x"
 	select WATCHDOG_CORE if WATCHDOG
+	select REGMAP_I2C
 	help
 	  If you say yes here you get support for Abracon AB080X and AB180X
 	  families of ultra-low-power  battery- and capacitor-backed real-time
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 4ac3ace687a1..23823fc2f545 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
+#include <linux/regmap.h>
 #include <linux/rtc.h>
 #include <linux/watchdog.h>
 
@@ -126,53 +127,55 @@ static struct abx80x_cap abx80x_caps[] = {
 
 struct abx80x_priv {
 	struct rtc_device *rtc;
-	struct i2c_client *client;
+	struct regmap *regmap;
 	struct watchdog_device wdog;
 	struct mutex lock;
 	int irq;
 };
 
-static int abx80x_write_config_key(struct i2c_client *client, u8 key)
+static int abx80x_write_config_key(struct device *dev, u8 key)
 {
-	if (i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, key) < 0) {
-		dev_err(&client->dev, "Unable to write configuration key\n");
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
+
+	if (regmap_write(priv->regmap, ABX8XX_REG_CFG_KEY, key) < 0) {
+		dev_err(dev, "Unable to write configuration key\n");
 		return -EIO;
 	}
 
 	return 0;
 }
 
-static int abx80x_is_rc_mode(struct i2c_client *client)
+static int abx80x_is_rc_mode(struct device *dev)
 {
-	int flags = 0;
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
+	unsigned int flags = 0;
+	int err;
 
-	flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
-	if (flags < 0) {
-		dev_err(&client->dev,
-			"Failed to read autocalibration attribute\n");
-		return flags;
+	err = regmap_read(priv->regmap, ABX8XX_REG_OSS, &flags);
+	if (err < 0) {
+		dev_err(dev, "Failed to read autocalibration attribute\n");
+		return err;
 	}
 
 	return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
 }
 
-static int abx80x_enable_trickle_charger(struct i2c_client *client,
-					 u8 trickle_cfg)
+static int abx80x_enable_trickle_charger(struct device *dev, u8 trickle_cfg)
 {
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	int err;
 
 	/*
 	 * Write the configuration key register to enable access to the Trickle
 	 * register
 	 */
-	if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
+	if (abx80x_write_config_key(dev, ABX8XX_CFG_KEY_MISC) < 0)
 		return -EIO;
 
-	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
-					ABX8XX_TRICKLE_CHARGE_ENABLE |
-					trickle_cfg);
+	err = regmap_write(priv->regmap, ABX8XX_REG_TRICKLE,
+			   ABX8XX_TRICKLE_CHARGE_ENABLE | trickle_cfg);
 	if (err < 0) {
-		dev_err(&client->dev, "Unable to write trickle register\n");
+		dev_err(dev, "Unable to write trickle register\n");
 		return -EIO;
 	}
 
@@ -181,19 +184,20 @@ static int abx80x_enable_trickle_charger(struct i2c_client *client,
 
 static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
-	struct i2c_client *client = to_i2c_client(dev);
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	unsigned char buf[8];
-	int err, flags, rc_mode = 0;
+	unsigned int flags;
+	int err, rc_mode = 0;
 
 	/* Read the Oscillator Failure only in XT mode */
-	rc_mode = abx80x_is_rc_mode(client);
+	rc_mode = abx80x_is_rc_mode(dev);
 	if (rc_mode < 0)
 		return rc_mode;
 
 	if (!rc_mode) {
-		flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
-		if (flags < 0)
-			return flags;
+		err = regmap_read(priv->regmap, ABX8XX_REG_OSS, &flags);
+		if (err < 0)
+			return err;
 
 		if (flags & ABX8XX_OSS_OF) {
 			dev_err(dev, "Oscillator failure, data is invalid.\n");
@@ -201,10 +205,9 @@ static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
 		}
 	}
 
-	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
-					    sizeof(buf), buf);
+	err = regmap_bulk_read(priv->regmap, ABX8XX_REG_HTH, buf, sizeof(buf));
 	if (err < 0) {
-		dev_err(&client->dev, "Unable to read date\n");
+		dev_err(dev, "Unable to read date\n");
 		return -EIO;
 	}
 
@@ -221,8 +224,7 @@ static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
 
 static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	unsigned char buf[8];
 	int err, flags;
 
@@ -240,22 +242,22 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 
 	guard(mutex)(&priv->lock);
 
-	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
-					     sizeof(buf), buf);
+	err = regmap_bulk_write(priv->regmap, ABX8XX_REG_HTH, buf,
+				sizeof(buf));
 	if (err < 0) {
-		dev_err(&client->dev, "Unable to write to date registers\n");
+		dev_err(dev, "Unable to write to date registers\n");
 		return -EIO;
 	}
 
 	/* Clear the OF bit of Oscillator Status Register */
-	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
-	if (flags < 0)
-		return flags;
+	err = regmap_read(priv->regmap, ABX8XX_REG_OSS, &flags);
+	if (err < 0)
+		return err;
 
-	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
-					flags & ~ABX8XX_OSS_OF);
+	err = regmap_write(priv->regmap, ABX8XX_REG_OSS,
+			   flags & ~ABX8XX_OSS_OF);
 	if (err < 0) {
-		dev_err(&client->dev, "Unable to write oscillator status register\n");
+		dev_err(dev, "Unable to write oscillator status register\n");
 		return err;
 	}
 
@@ -264,16 +266,17 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 
 static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
 {
-	struct i2c_client *client = dev_id;
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
+	struct device *dev = dev_id;
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	struct rtc_device *rtc = priv->rtc;
 	irqreturn_t handled = IRQ_NONE;
-	int status;
+	unsigned int status;
+	int err;
 
 	guard(mutex)(&priv->lock);
 
-	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
-	if (status < 0)
+	err = regmap_read(priv->regmap, ABX8XX_REG_STATUS, &status);
+	if (err < 0)
 		return handled;
 
 	if (status & ABX8XX_STATUS_AF) {
@@ -286,36 +289,35 @@ static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
 	 * reset kicks in.
 	 */
 	if (status & ABX8XX_STATUS_WDT) {
-		dev_alert(&client->dev, "watchdog timeout interrupt.\n");
+		dev_alert(dev, "watchdog timeout interrupt.\n");
 		handled = IRQ_HANDLED;
 	}
 
 	if (handled == IRQ_HANDLED)
-		i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS,
-					  status & ~(ABX8XX_STATUS_AF | ABX8XX_STATUS_WDT));
+		regmap_write(priv->regmap, ABX8XX_REG_STATUS,
+			     status & ~(ABX8XX_STATUS_AF | ABX8XX_STATUS_WDT));
 
 	return handled;
 }
 
 static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	unsigned char buf[7];
 
-	int irq_mask, err;
+	unsigned int irq_mask;
+	int err;
 
 	if (priv->irq <= 0)
 		return -EINVAL;
 
-	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
-					    sizeof(buf), buf);
+	err = regmap_bulk_read(priv->regmap, ABX8XX_REG_ASC, buf, sizeof(buf));
 	if (err)
 		return err;
 
-	irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
-	if (irq_mask < 0)
-		return irq_mask;
+	err = regmap_read(priv->regmap, ABX8XX_REG_IRQ, &irq_mask);
+	if (err < 0)
+		return err;
 
 	t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
 	t->time.tm_min = bcd2bin(buf[1] & 0x7F);
@@ -332,8 +334,7 @@ static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	u8 alarm[6];
 	int err;
 
@@ -349,17 +350,16 @@ static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 
 	guard(mutex)(&priv->lock);
 
-	err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
-					     sizeof(alarm), alarm);
+	err = regmap_bulk_write(priv->regmap, ABX8XX_REG_AHTH,
+				alarm, sizeof(alarm));
 	if (err < 0) {
-		dev_err(&client->dev, "Unable to write alarm registers\n");
+		dev_err(dev, "Unable to write alarm registers\n");
 		return -EIO;
 	}
 
 	if (t->enabled) {
-		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
-						(ABX8XX_IRQ_IM_1_4 |
-						 ABX8XX_IRQ_AIE));
+		err = regmap_write(priv->regmap, ABX8XX_REG_IRQ,
+				   ABX8XX_IRQ_IM_1_4 | ABX8XX_IRQ_AIE);
 		if (err)
 			return err;
 	}
@@ -370,8 +370,7 @@ static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 static int abx80x_rtc_set_autocalibration(struct device *dev,
 					  int autocalibration)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	int retval, flags = 0;
 
 	if ((autocalibration != 0) && (autocalibration != 1024) &&
@@ -382,9 +381,9 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 
 	guard(mutex)(&priv->lock);
 
-	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
-	if (flags < 0)
-		return flags;
+	retval = regmap_read(priv->regmap, ABX8XX_REG_OSC, &flags);
+	if (retval < 0)
+		return retval;
 
 	if (autocalibration == 0) {
 		flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
@@ -398,22 +397,23 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 	}
 
 	/* Unlock write access to Oscillator Control Register */
-	if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
+	if (abx80x_write_config_key(dev, ABX8XX_CFG_KEY_OSC) < 0)
 		return -EIO;
 
-	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
+	retval = regmap_write(priv->regmap, ABX8XX_REG_OSC, flags);
 
 	return retval;
 }
 
 static int abx80x_rtc_get_autocalibration(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	int flags = 0, autocalibration;
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
+	unsigned int flags = 0;
+	int autocalibration, err;
 
-	flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
-	if (flags < 0)
-		return flags;
+	err = regmap_read(priv->regmap, ABX8XX_REG_OSC, &flags);
+	if (err < 0)
+		return err;
 
 	if (flags & ABX8XX_OSC_ACAL_512)
 		autocalibration = 512;
@@ -464,8 +464,7 @@ static ssize_t oscillator_store(struct device *dev,
 				struct device_attribute *attr,
 				const char *buf, size_t count)
 {
-	struct i2c_client *client = to_i2c_client(dev->parent);
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
+	struct abx80x_priv *priv = dev_get_drvdata(dev->parent);
 	int retval, flags, rc_mode = 0;
 
 	if (strncmp(buf, "rc", 2) == 0) {
@@ -479,9 +478,9 @@ static ssize_t oscillator_store(struct device *dev,
 
 	guard(mutex)(&priv->lock);
 
-	flags =  i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
-	if (flags < 0)
-		return flags;
+	retval = regmap_read(priv->regmap, ABX8XX_REG_OSC, &flags);
+	if (retval < 0)
+		return retval;
 
 	if (rc_mode == 0)
 		flags &= ~(ABX8XX_OSC_OSEL);
@@ -489,10 +488,10 @@ static ssize_t oscillator_store(struct device *dev,
 		flags |= (ABX8XX_OSC_OSEL);
 
 	/* Unlock write access on Oscillator Control register */
-	if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
+	if (abx80x_write_config_key(dev->parent, ABX8XX_CFG_KEY_OSC) < 0)
 		return -EIO;
 
-	retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
+	retval = regmap_write(priv->regmap, ABX8XX_REG_OSC, flags);
 	if (retval < 0) {
 		dev_err(dev, "Failed to write Oscillator Control register\n");
 		return retval;
@@ -505,9 +504,8 @@ static ssize_t oscillator_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
 	int rc_mode = 0;
-	struct i2c_client *client = to_i2c_client(dev->parent);
 
-	rc_mode = abx80x_is_rc_mode(client);
+	rc_mode = abx80x_is_rc_mode(dev->parent);
 
 	if (rc_mode < 0) {
 		dev_err(dev, "Failed to read RTC oscillator selection\n");
@@ -535,33 +533,31 @@ static const struct attribute_group rtc_calib_attr_group = {
 
 static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	int err;
 
 	guard(mutex)(&priv->lock);
 
 	if (enabled)
-		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
-						(ABX8XX_IRQ_IM_1_4 |
-						 ABX8XX_IRQ_AIE));
+		err = regmap_write(priv->regmap, ABX8XX_REG_IRQ,
+				   ABX8XX_IRQ_IM_1_4 | ABX8XX_IRQ_AIE);
 	else
-		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
-						ABX8XX_IRQ_IM_1_4);
+		err = regmap_write(priv->regmap, ABX8XX_REG_IRQ,
+				   ABX8XX_IRQ_IM_1_4);
 	return err;
 }
 
 static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct abx80x_priv *priv = i2c_get_clientdata(client);
-	int status, tmp;
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
+	unsigned int status;
+	int err, tmp;
 
 	switch (cmd) {
 	case RTC_VL_READ:
-		status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
-		if (status < 0)
-			return status;
+		err = regmap_read(priv->regmap, ABX8XX_REG_STATUS, &status);
+		if (err < 0)
+			return err;
 
 		tmp = status & ABX8XX_STATUS_BLF ? RTC_VL_BACKUP_LOW : 0;
 
@@ -570,16 +566,15 @@ static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 	case RTC_VL_CLR:
 		guard(mutex)(&priv->lock);
 
-		status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
-		if (status < 0)
-			return status;
+		err = regmap_read(priv->regmap, ABX8XX_REG_STATUS, &status);
+		if (err < 0)
+			return err;
 
 		status &= ~ABX8XX_STATUS_BLF;
 
-		tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS,
-						status);
-		if (tmp < 0)
-			return tmp;
+		err = regmap_write(priv->regmap, ABX8XX_REG_STATUS, status);
+		if (err < 0)
+			return err;
 
 		return 0;
 
@@ -597,9 +592,9 @@ static const struct rtc_class_ops abx80x_rtc_ops = {
 	.ioctl		= abx80x_ioctl,
 };
 
-static int abx80x_dt_trickle_cfg(struct i2c_client *client)
+static int abx80x_dt_trickle_cfg(struct device *dev)
 {
-	struct device_node *np = client->dev.of_node;
+	struct device_node *np = dev->of_node;
 	const char *diode;
 	int trickle_cfg = 0;
 	int i, ret;
@@ -614,7 +609,7 @@ static int abx80x_dt_trickle_cfg(struct i2c_client *client)
 	} else if (!strcmp(diode, "schottky")) {
 		trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
 	} else {
-		dev_dbg(&client->dev, "Invalid tc-diode value: %s\n", diode);
+		dev_dbg(dev, "Invalid tc-diode value: %s\n", diode);
 		return -EINVAL;
 	}
 
@@ -627,7 +622,7 @@ static int abx80x_dt_trickle_cfg(struct i2c_client *client)
 			break;
 
 	if (i == sizeof(trickle_resistors)) {
-		dev_dbg(&client->dev, "Invalid tc-resistor value: %u\n", tmp);
+		dev_dbg(dev, "Invalid tc-resistor value: %u\n", tmp);
 		return -EINVAL;
 	}
 
@@ -654,7 +649,7 @@ static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog,
 	 * Writing any timeout to the WDT register resets the watchdog timer.
 	 * Writing 0 disables it.
 	 */
-	return i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_WDT, val);
+	return regmap_write(priv->regmap, ABX8XX_REG_WDT, val);
 }
 
 static int abx80x_wdog_set_timeout(struct watchdog_device *wdog,
@@ -699,9 +694,11 @@ static const struct watchdog_ops abx80x_wdog_ops = {
 	.set_timeout = abx80x_wdog_set_timeout,
 };
 
-static int abx80x_setup_watchdog(struct abx80x_priv *priv)
+static int abx80x_setup_watchdog(struct device *dev)
 {
-	priv->wdog.parent = &priv->client->dev;
+	struct abx80x_priv *priv = dev_get_drvdata(dev);
+
+	priv->wdog.parent = dev;
 	priv->wdog.ops = &abx80x_wdog_ops;
 	priv->wdog.info = &abx80x_wdog_info;
 	priv->wdog.min_timeout = 1;
@@ -710,10 +707,10 @@ static int abx80x_setup_watchdog(struct abx80x_priv *priv)
 
 	watchdog_set_drvdata(&priv->wdog, priv);
 
-	return devm_watchdog_register_device(&priv->client->dev, &priv->wdog);
+	return devm_watchdog_register_device(dev, &priv->wdog);
 }
 #else
-static int abx80x_setup_watchdog(struct abx80x_priv *priv)
+static int abx80x_setup_watchdog(struct device *dev)
 {
 	return 0;
 }
@@ -725,33 +722,29 @@ static int abx80x_nvmem_xfer(struct abx80x_priv *priv, unsigned int offset,
 	int ret;
 
 	while (bytes) {
-		u8 extram, reg, len, lower, upper;
+		u8 reg, len, lower, upper;
 
 		lower = FIELD_GET(NVMEM_ADDR_LOWER, offset);
 		upper = FIELD_GET(NVMEM_ADDR_UPPER, offset);
-		extram = FIELD_PREP(ABX8XX_EXTRAM_XADS, upper);
 		reg = ABX8XX_SRAM_BASE + lower;
 		len = min(lower + bytes, (size_t)ABX8XX_SRAM_WIN_SIZE) - lower;
 		len = min_t(u8, len, I2C_SMBUS_BLOCK_MAX);
 
 		guard(mutex)(&priv->lock);
 
-		ret = i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_EXTRAM,
-						extram);
+		ret = regmap_update_bits(priv->regmap, ABX8XX_REG_EXTRAM,
+					 ABX8XX_EXTRAM_XADS, upper);
 		if (ret)
 			return ret;
 
 		if (write) {
-			ret = i2c_smbus_write_i2c_block_data(priv->client, reg,
-							     len, val);
+			ret = regmap_bulk_write(priv->regmap, reg, val, len);
 			if (ret)
 				return ret;
 		} else {
-			ret = i2c_smbus_read_i2c_block_data(priv->client, reg,
-							    len, val);
-			if (ret <= 0)
-				return ret ? ret : -EIO;
-			len = ret;
+			ret = regmap_bulk_read(priv->regmap, reg, val, len);
+			if (ret)
+				return ret;
 		}
 
 		offset += len;
@@ -787,6 +780,38 @@ static int abx80x_setup_nvmem(struct abx80x_priv *priv)
 	return devm_rtc_nvmem_register(priv->rtc, &config);
 }
 
+static const struct regmap_range abx80x_no_read_ranges[] = {
+	regmap_reg_range(0x1e, 0x1e),
+	regmap_reg_range(0x22, 0x25),
+	regmap_reg_range(0x31, 0x3e),
+};
+
+static const struct regmap_range abx80x_no_write_ranges[] = {
+	regmap_reg_range(0x1e, 0x1e),
+	regmap_reg_range(0x22, 0x25),
+	regmap_reg_range(ABX8XX_REG_ID0, ABX8XX_REG_ID0 + 6),
+	regmap_reg_range(0x31, 0x3e),
+};
+
+static const struct regmap_access_table abx80x_read_table = {
+	.no_ranges = abx80x_no_read_ranges,
+	.n_no_ranges = ARRAY_SIZE(abx80x_no_read_ranges),
+};
+
+static const struct regmap_access_table abx80x_write_table = {
+	.no_ranges = abx80x_no_write_ranges,
+	.n_no_ranges = ARRAY_SIZE(abx80x_no_write_ranges),
+};
+
+static const struct regmap_config abx80x_regmap_config_i2c = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = ABX8XX_SRAM_BASE + ABX8XX_SRAM_WIN_SIZE - 1,
+
+	.rd_table = &abx80x_read_table,
+	.wr_table = &abx80x_write_table,
+};
+
 static const struct i2c_device_id abx80x_id[] = {
 	{ .name = "abx80x", .driver_data = ABX80X },
 	{ .name = "ab0801", .driver_data = AB0801 },
@@ -804,6 +829,7 @@ MODULE_DEVICE_TABLE(i2c, abx80x_id);
 
 static int abx80x_probe(struct i2c_client *client)
 {
+	struct regmap *regmap;
 	struct device_node *np = client->dev.of_node;
 	struct abx80x_priv *priv;
 	int i, data, err, trickle_cfg = -EINVAL;
@@ -818,8 +844,30 @@ static int abx80x_probe(struct i2c_client *client)
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
 
-	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
-					    sizeof(buf), buf);
+	regmap = devm_regmap_init_i2c(client, &abx80x_regmap_config_i2c);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Unable to allocate regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
+	if (priv == NULL)
+		return -ENOMEM;
+
+	priv->rtc = devm_rtc_allocate_device(&client->dev);
+	if (IS_ERR(priv->rtc))
+		return PTR_ERR(priv->rtc);
+
+	priv->rtc->ops = &abx80x_rtc_ops;
+	priv->irq = client->irq;
+	priv->regmap = regmap;
+	err = devm_mutex_init(&client->dev, &priv->lock);
+	if (err)
+		return err;
+
+	dev_set_drvdata(&client->dev, priv);
+
+	err = regmap_bulk_read(regmap, ABX8XX_REG_ID0, buf, sizeof(buf));
 	if (err < 0) {
 		dev_err(&client->dev, "Unable to read partnumber\n");
 		return -EIO;
@@ -834,16 +882,14 @@ static int abx80x_probe(struct i2c_client *client)
 	dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
 		 partnumber, majrev, minrev, lot, wafer, uid);
 
-	data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
-	if (data < 0) {
+	err = regmap_read(regmap, ABX8XX_REG_CTRL1, &data);
+	if (err < 0) {
 		dev_err(&client->dev, "Unable to read control register\n");
 		return -EIO;
 	}
 
-	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
-					((data & ~(ABX8XX_CTRL_12_24 |
-						   ABX8XX_CTRL_ARST)) |
-					 ABX8XX_CTRL_WRITE));
+	err = regmap_write(regmap, ABX8XX_REG_CTRL1,
+			   (data & ~(ABX8XX_CTRL_12_24 | ABX8XX_CTRL_ARST)) | ABX8XX_CTRL_WRITE);
 	if (err < 0) {
 		dev_err(&client->dev, "Unable to write control register\n");
 		return -EIO;
@@ -857,15 +903,15 @@ static int abx80x_probe(struct i2c_client *client)
 		 * register is set. RV-1805-C3 datasheet indicates that
 		 * the bit should be cleared in section 11h - Control2.
 		 */
-		data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL2);
-		if (data < 0) {
+		err = regmap_read(regmap, ABX8XX_REG_CTRL2, &data);
+		if (err < 0) {
 			dev_err(&client->dev,
 				"Unable to read control2 register\n");
 			return -EIO;
 		}
 
-		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL2,
-						data & ~ABX8XX_CTRL2_RSVD);
+		err = regmap_write(regmap, ABX8XX_REG_CTRL2,
+				   data & ~ABX8XX_CTRL2_RSVD);
 		if (err < 0) {
 			dev_err(&client->dev,
 				"Unable to write control2 register\n");
@@ -877,8 +923,8 @@ static int abx80x_probe(struct i2c_client *client)
 		 * 10pin package and the EXTI input is not present.
 		 * Disable it to avoid leakage.
 		 */
-		data = i2c_smbus_read_byte_data(client, ABX8XX_REG_OUT_CTRL);
-		if (data < 0) {
+		err = regmap_read(regmap, ABX8XX_REG_OUT_CTRL, &data);
+		if (err < 0) {
 			dev_err(&client->dev,
 				"Unable to read output control register\n");
 			return -EIO;
@@ -888,11 +934,11 @@ static int abx80x_probe(struct i2c_client *client)
 		 * Write the configuration key register to enable access to
 		 * the config2 register
 		 */
-		if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
+		if (abx80x_write_config_key(&client->dev, ABX8XX_CFG_KEY_MISC) < 0)
 			return -EIO;
 
-		err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OUT_CTRL,
-						data | ABX8XX_OUT_CTRL_EXDS);
+		err = regmap_write(regmap, ABX8XX_REG_OUT_CTRL,
+				   data | ABX8XX_OUT_CTRL_EXDS);
 		if (err < 0) {
 			dev_err(&client->dev,
 				"Unable to write output control register\n");
@@ -920,38 +966,20 @@ static int abx80x_probe(struct i2c_client *client)
 	}
 
 	if (np && abx80x_caps[part].has_tc)
-		trickle_cfg = abx80x_dt_trickle_cfg(client);
+		trickle_cfg = abx80x_dt_trickle_cfg(&client->dev);
 
 	if (trickle_cfg > 0) {
 		dev_info(&client->dev, "Enabling trickle charger: %02x\n",
 			 trickle_cfg);
-		abx80x_enable_trickle_charger(client, trickle_cfg);
+		abx80x_enable_trickle_charger(&client->dev, trickle_cfg);
 	}
 
-	err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
-					BIT(2));
-	if (err)
-		return err;
-
-	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
-	if (priv == NULL)
-		return -ENOMEM;
-
-	priv->rtc = devm_rtc_allocate_device(&client->dev);
-	if (IS_ERR(priv->rtc))
-		return PTR_ERR(priv->rtc);
-
-	priv->rtc->ops = &abx80x_rtc_ops;
-	priv->client = client;
-	priv->irq = client->irq;
-	err = devm_mutex_init(&client->dev, &priv->lock);
+	err = regmap_write(regmap, ABX8XX_REG_CD_TIMER_CTL, BIT(2));
 	if (err)
 		return err;
 
-	i2c_set_clientdata(client, priv);
-
 	if (abx80x_caps[part].has_wdog) {
-		err = abx80x_setup_watchdog(priv);
+		err = abx80x_setup_watchdog(&client->dev);
 		if (err)
 			return err;
 	}
@@ -966,7 +994,7 @@ static int abx80x_probe(struct i2c_client *client)
 						abx80x_handle_irq,
 						IRQF_SHARED | IRQF_ONESHOT,
 						"abx8xx",
-						client);
+						&client->dev);
 		if (err) {
 			dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
 			priv->irq = 0;
-- 
2.55.0

[PATCH v3 6/8] rtc: abx80x: replace read-modify-write pattern with regmap helpers

[Antoni Pokusinski]

Before introducing the regmap usage in the driver, updating specific
bits of a register was performed using the read-modify-write pattern.
Now, the functions regmap_update_bits() and regmap_write_bits() can
be used to simplify the code.

Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 drivers/rtc/rtc-abx80x.c | 109 +++++++++++----------------------------
 1 file changed, 30 insertions(+), 79 deletions(-)

diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 23823fc2f545..52f958e2aecd 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -226,7 +226,7 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct abx80x_priv *priv = dev_get_drvdata(dev);
 	unsigned char buf[8];
-	int err, flags;
+	int err;
 
 	if (tm->tm_year < 100)
 		return -EINVAL;
@@ -250,18 +250,11 @@ static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	}
 
 	/* Clear the OF bit of Oscillator Status Register */
-	err = regmap_read(priv->regmap, ABX8XX_REG_OSS, &flags);
+	err = regmap_update_bits(priv->regmap, ABX8XX_REG_OSS, ABX8XX_OSS_OF, 0);
 	if (err < 0)
-		return err;
-
-	err = regmap_write(priv->regmap, ABX8XX_REG_OSS,
-			   flags & ~ABX8XX_OSS_OF);
-	if (err < 0) {
 		dev_err(dev, "Unable to write oscillator status register\n");
-		return err;
-	}
 
-	return 0;
+	return err;
 }
 
 static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
@@ -371,7 +364,7 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 					  int autocalibration)
 {
 	struct abx80x_priv *priv = dev_get_drvdata(dev);
-	int retval, flags = 0;
+	int flags = 0;
 
 	if ((autocalibration != 0) && (autocalibration != 1024) &&
 	    (autocalibration != 512)) {
@@ -379,12 +372,6 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 		return -EINVAL;
 	}
 
-	guard(mutex)(&priv->lock);
-
-	retval = regmap_read(priv->regmap, ABX8XX_REG_OSC, &flags);
-	if (retval < 0)
-		return retval;
-
 	if (autocalibration == 0) {
 		flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
 	} else if (autocalibration == 1024) {
@@ -396,13 +383,15 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
 		flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
 	}
 
+	guard(mutex)(&priv->lock);
+
 	/* Unlock write access to Oscillator Control Register */
 	if (abx80x_write_config_key(dev, ABX8XX_CFG_KEY_OSC) < 0)
 		return -EIO;
 
-	retval = regmap_write(priv->regmap, ABX8XX_REG_OSC, flags);
-
-	return retval;
+	return regmap_write_bits(priv->regmap, ABX8XX_REG_OSC,
+				 ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512,
+				 flags);
 }
 
 static int abx80x_rtc_get_autocalibration(struct device *dev)
@@ -465,7 +454,7 @@ static ssize_t oscillator_store(struct device *dev,
 				const char *buf, size_t count)
 {
 	struct abx80x_priv *priv = dev_get_drvdata(dev->parent);
-	int retval, flags, rc_mode = 0;
+	int retval, rc_mode = 0;
 
 	if (strncmp(buf, "rc", 2) == 0) {
 		rc_mode = 1;
@@ -478,24 +467,14 @@ static ssize_t oscillator_store(struct device *dev,
 
 	guard(mutex)(&priv->lock);
 
-	retval = regmap_read(priv->regmap, ABX8XX_REG_OSC, &flags);
-	if (retval < 0)
-		return retval;
-
-	if (rc_mode == 0)
-		flags &= ~(ABX8XX_OSC_OSEL);
-	else
-		flags |= (ABX8XX_OSC_OSEL);
-
 	/* Unlock write access on Oscillator Control register */
 	if (abx80x_write_config_key(dev->parent, ABX8XX_CFG_KEY_OSC) < 0)
 		return -EIO;
 
-	retval = regmap_write(priv->regmap, ABX8XX_REG_OSC, flags);
-	if (retval < 0) {
+	retval = regmap_write_bits(priv->regmap, ABX8XX_REG_OSC, ABX8XX_OSC_OSEL,
+				   rc_mode == 0 ? 0 : (ABX8XX_OSC_OSEL));
+	if (retval < 0)
 		dev_err(dev, "Failed to write Oscillator Control register\n");
-		return retval;
-	}
 
 	return retval ? retval : count;
 }
@@ -566,17 +545,8 @@ static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 	case RTC_VL_CLR:
 		guard(mutex)(&priv->lock);
 
-		err = regmap_read(priv->regmap, ABX8XX_REG_STATUS, &status);
-		if (err < 0)
-			return err;
-
-		status &= ~ABX8XX_STATUS_BLF;
-
-		err = regmap_write(priv->regmap, ABX8XX_REG_STATUS, status);
-		if (err < 0)
-			return err;
-
-		return 0;
+		return regmap_update_bits(priv->regmap, ABX8XX_REG_STATUS,
+					  ABX8XX_STATUS_BLF, 0);
 
 	default:
 		return -ENOIOCTLCMD;
@@ -832,7 +802,7 @@ static int abx80x_probe(struct i2c_client *client)
 	struct regmap *regmap;
 	struct device_node *np = client->dev.of_node;
 	struct abx80x_priv *priv;
-	int i, data, err, trickle_cfg = -EINVAL;
+	int i, err, trickle_cfg = -EINVAL;
 	char buf[7];
 	unsigned int part = (uintptr_t)i2c_get_match_data(client);
 	unsigned int partnumber;
@@ -882,14 +852,9 @@ static int abx80x_probe(struct i2c_client *client)
 	dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
 		 partnumber, majrev, minrev, lot, wafer, uid);
 
-	err = regmap_read(regmap, ABX8XX_REG_CTRL1, &data);
-	if (err < 0) {
-		dev_err(&client->dev, "Unable to read control register\n");
-		return -EIO;
-	}
-
-	err = regmap_write(regmap, ABX8XX_REG_CTRL1,
-			   (data & ~(ABX8XX_CTRL_12_24 | ABX8XX_CTRL_ARST)) | ABX8XX_CTRL_WRITE);
+	err = regmap_update_bits(regmap, ABX8XX_REG_CTRL1,
+				 ABX8XX_CTRL_12_24 | ABX8XX_CTRL_ARST | ABX8XX_CTRL_WRITE,
+				 ABX8XX_CTRL_WRITE);
 	if (err < 0) {
 		dev_err(&client->dev, "Unable to write control register\n");
 		return -EIO;
@@ -903,30 +868,10 @@ static int abx80x_probe(struct i2c_client *client)
 		 * register is set. RV-1805-C3 datasheet indicates that
 		 * the bit should be cleared in section 11h - Control2.
 		 */
-		err = regmap_read(regmap, ABX8XX_REG_CTRL2, &data);
-		if (err < 0) {
-			dev_err(&client->dev,
-				"Unable to read control2 register\n");
-			return -EIO;
-		}
-
-		err = regmap_write(regmap, ABX8XX_REG_CTRL2,
-				   data & ~ABX8XX_CTRL2_RSVD);
-		if (err < 0) {
-			dev_err(&client->dev,
-				"Unable to write control2 register\n");
-			return -EIO;
-		}
-
-		/*
-		 * Avoid extra power leakage. The RV1805 uses smaller
-		 * 10pin package and the EXTI input is not present.
-		 * Disable it to avoid leakage.
-		 */
-		err = regmap_read(regmap, ABX8XX_REG_OUT_CTRL, &data);
+		err = regmap_update_bits(regmap, ABX8XX_REG_CTRL2,
+					 ABX8XX_CTRL2_RSVD, 0);
 		if (err < 0) {
-			dev_err(&client->dev,
-				"Unable to read output control register\n");
+			dev_err(&client->dev, "Unable to write control2 register\n");
 			return -EIO;
 		}
 
@@ -937,8 +882,14 @@ static int abx80x_probe(struct i2c_client *client)
 		if (abx80x_write_config_key(&client->dev, ABX8XX_CFG_KEY_MISC) < 0)
 			return -EIO;
 
-		err = regmap_write(regmap, ABX8XX_REG_OUT_CTRL,
-				   data | ABX8XX_OUT_CTRL_EXDS);
+		/*
+		 * Avoid extra power leakage. The RV1805 uses smaller
+		 * 10pin package and the EXTI input is not present.
+		 * Disable it to avoid leakage.
+		 */
+		err = regmap_write_bits(regmap, ABX8XX_REG_OUT_CTRL,
+					ABX8XX_OUT_CTRL_EXDS,
+					ABX8XX_OUT_CTRL_EXDS);
 		if (err < 0) {
 			dev_err(&client->dev,
 				"Unable to write output control register\n");
-- 
2.55.0

[PATCH v3 7/8] rtc: abx80x: create abx80x_i2c_probe()

[Antoni Pokusinski]

Move the I2C-specific code from abx80x_probe() to the newly created
function. This is a preparation for introducing the support for
ABX81X RTCs which use SPI interface.

Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 drivers/rtc/rtc-abx80x.c | 167 ++++++++++++++++++++++++---------------
 1 file changed, 103 insertions(+), 64 deletions(-)

diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 52f958e2aecd..6583e097af68 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -773,73 +773,38 @@ static const struct regmap_access_table abx80x_write_table = {
 	.n_no_ranges = ARRAY_SIZE(abx80x_no_write_ranges),
 };
 
-static const struct regmap_config abx80x_regmap_config_i2c = {
-	.reg_bits = 8,
-	.val_bits = 8,
-	.max_register = ABX8XX_SRAM_BASE + ABX8XX_SRAM_WIN_SIZE - 1,
-
-	.rd_table = &abx80x_read_table,
-	.wr_table = &abx80x_write_table,
-};
-
-static const struct i2c_device_id abx80x_id[] = {
-	{ .name = "abx80x", .driver_data = ABX80X },
-	{ .name = "ab0801", .driver_data = AB0801 },
-	{ .name = "ab0803", .driver_data = AB0803 },
-	{ .name = "ab0804", .driver_data = AB0804 },
-	{ .name = "ab0805", .driver_data = AB0805 },
-	{ .name = "ab1801", .driver_data = AB1801 },
-	{ .name = "ab1803", .driver_data = AB1803 },
-	{ .name = "ab1804", .driver_data = AB1804 },
-	{ .name = "ab1805", .driver_data = AB1805 },
-	{ .name = "rv1805", .driver_data = RV1805 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, abx80x_id);
-
-static int abx80x_probe(struct i2c_client *client)
+static int abx80x_probe(struct device *dev, struct regmap *regmap, int irq,
+			struct device_node *np, unsigned int part)
 {
-	struct regmap *regmap;
-	struct device_node *np = client->dev.of_node;
 	struct abx80x_priv *priv;
 	int i, err, trickle_cfg = -EINVAL;
 	char buf[7];
-	unsigned int part = (uintptr_t)i2c_get_match_data(client);
 	unsigned int partnumber;
 	unsigned int majrev, minrev;
 	unsigned int lot;
 	unsigned int wafer;
 	unsigned int uid;
 
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
-		return -ENODEV;
-
-	regmap = devm_regmap_init_i2c(client, &abx80x_regmap_config_i2c);
-	if (IS_ERR(regmap)) {
-		dev_err(&client->dev, "Unable to allocate regmap\n");
-		return PTR_ERR(regmap);
-	}
-
-	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (priv == NULL)
 		return -ENOMEM;
 
-	priv->rtc = devm_rtc_allocate_device(&client->dev);
+	priv->rtc = devm_rtc_allocate_device(dev);
 	if (IS_ERR(priv->rtc))
 		return PTR_ERR(priv->rtc);
 
 	priv->rtc->ops = &abx80x_rtc_ops;
-	priv->irq = client->irq;
+	priv->irq = irq;
 	priv->regmap = regmap;
-	err = devm_mutex_init(&client->dev, &priv->lock);
+	err = devm_mutex_init(dev, &priv->lock);
 	if (err)
 		return err;
 
-	dev_set_drvdata(&client->dev, priv);
+	dev_set_drvdata(dev, priv);
 
 	err = regmap_bulk_read(regmap, ABX8XX_REG_ID0, buf, sizeof(buf));
 	if (err < 0) {
-		dev_err(&client->dev, "Unable to read partnumber\n");
+		dev_err(dev, "Unable to read partnumber\n");
 		return -EIO;
 	}
 
@@ -849,14 +814,14 @@ static int abx80x_probe(struct i2c_client *client)
 	lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3];
 	uid = ((buf[4] & 0x7f) << 8) | buf[5];
 	wafer = (buf[6] & 0x7c) >> 2;
-	dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
+	dev_info(dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
 		 partnumber, majrev, minrev, lot, wafer, uid);
 
 	err = regmap_update_bits(regmap, ABX8XX_REG_CTRL1,
 				 ABX8XX_CTRL_12_24 | ABX8XX_CTRL_ARST | ABX8XX_CTRL_WRITE,
 				 ABX8XX_CTRL_WRITE);
 	if (err < 0) {
-		dev_err(&client->dev, "Unable to write control register\n");
+		dev_err(dev, "Unable to write control register\n");
 		return -EIO;
 	}
 
@@ -871,7 +836,7 @@ static int abx80x_probe(struct i2c_client *client)
 		err = regmap_update_bits(regmap, ABX8XX_REG_CTRL2,
 					 ABX8XX_CTRL2_RSVD, 0);
 		if (err < 0) {
-			dev_err(&client->dev, "Unable to write control2 register\n");
+			dev_err(dev, "Unable to write control2 register\n");
 			return -EIO;
 		}
 
@@ -879,7 +844,7 @@ static int abx80x_probe(struct i2c_client *client)
 		 * Write the configuration key register to enable access to
 		 * the config2 register
 		 */
-		if (abx80x_write_config_key(&client->dev, ABX8XX_CFG_KEY_MISC) < 0)
+		if (abx80x_write_config_key(dev, ABX8XX_CFG_KEY_MISC) < 0)
 			return -EIO;
 
 		/*
@@ -891,7 +856,7 @@ static int abx80x_probe(struct i2c_client *client)
 					ABX8XX_OUT_CTRL_EXDS,
 					ABX8XX_OUT_CTRL_EXDS);
 		if (err < 0) {
-			dev_err(&client->dev,
+			dev_err(dev,
 				"Unable to write output control register\n");
 			return -EIO;
 		}
@@ -903,26 +868,24 @@ static int abx80x_probe(struct i2c_client *client)
 			if (partnumber == abx80x_caps[i].pn)
 				break;
 		if (abx80x_caps[i].pn == 0) {
-			dev_err(&client->dev, "Unknown part: %04x\n",
-				partnumber);
+			dev_err(dev, "Unknown part: %04x\n", partnumber);
 			return -EINVAL;
 		}
 		part = i;
 	}
 
 	if (partnumber != abx80x_caps[part].pn) {
-		dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
+		dev_err(dev, "partnumber mismatch %04x != %04x\n",
 			partnumber, abx80x_caps[part].pn);
 		return -EINVAL;
 	}
 
 	if (np && abx80x_caps[part].has_tc)
-		trickle_cfg = abx80x_dt_trickle_cfg(&client->dev);
+		trickle_cfg = abx80x_dt_trickle_cfg(dev);
 
 	if (trickle_cfg > 0) {
-		dev_info(&client->dev, "Enabling trickle charger: %02x\n",
-			 trickle_cfg);
-		abx80x_enable_trickle_charger(&client->dev, trickle_cfg);
+		dev_info(dev, "Enabling trickle charger: %02x\n", trickle_cfg);
+		abx80x_enable_trickle_charger(dev, trickle_cfg);
 	}
 
 	err = regmap_write(regmap, ABX8XX_REG_CD_TIMER_CTL, BIT(2));
@@ -930,7 +893,7 @@ static int abx80x_probe(struct i2c_client *client)
 		return err;
 
 	if (abx80x_caps[part].has_wdog) {
-		err = abx80x_setup_watchdog(&client->dev);
+		err = abx80x_setup_watchdog(dev);
 		if (err)
 			return err;
 	}
@@ -940,14 +903,14 @@ static int abx80x_probe(struct i2c_client *client)
 		return err;
 
 	if (priv->irq > 0) {
-		dev_info(&client->dev, "IRQ %d supplied\n", priv->irq);
-		err = devm_request_threaded_irq(&client->dev, priv->irq, NULL,
+		dev_info(dev, "IRQ %d supplied\n", priv->irq);
+		err = devm_request_threaded_irq(dev, priv->irq, NULL,
 						abx80x_handle_irq,
 						IRQF_SHARED | IRQF_ONESHOT,
 						"abx8xx",
-						&client->dev);
+						dev);
 		if (err) {
-			dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
+			dev_err(dev, "unable to request IRQ, alarms disabled\n");
 			priv->irq = 0;
 		}
 	}
@@ -956,14 +919,39 @@ static int abx80x_probe(struct i2c_client *client)
 
 	err = rtc_add_group(priv->rtc, &rtc_calib_attr_group);
 	if (err) {
-		dev_err(&client->dev, "Failed to create sysfs group: %d\n",
-			err);
+		dev_err(dev, "Failed to create sysfs group: %d\n", err);
 		return err;
 	}
 
 	return devm_rtc_register_device(priv->rtc);
 }
 
+#if IS_ENABLED(CONFIG_I2C)
+
+static const struct regmap_config abx80x_regmap_config_i2c = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = ABX8XX_SRAM_BASE + ABX8XX_SRAM_WIN_SIZE - 1,
+
+	.rd_table = &abx80x_read_table,
+	.wr_table = &abx80x_write_table,
+};
+
+static const struct i2c_device_id abx80x_id[] = {
+	{ .name = "abx80x", .driver_data = ABX80X },
+	{ .name = "ab0801", .driver_data = AB0801 },
+	{ .name = "ab0803", .driver_data = AB0803 },
+	{ .name = "ab0804", .driver_data = AB0804 },
+	{ .name = "ab0805", .driver_data = AB0805 },
+	{ .name = "ab1801", .driver_data = AB1801 },
+	{ .name = "ab1803", .driver_data = AB1803 },
+	{ .name = "ab1804", .driver_data = AB1804 },
+	{ .name = "ab1805", .driver_data = AB1805 },
+	{ .name = "rv1805", .driver_data = RV1805 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, abx80x_id);
+
 #ifdef CONFIG_OF
 static const struct of_device_id abx80x_of_match[] = {
 	{
@@ -1011,16 +999,67 @@ static const struct of_device_id abx80x_of_match[] = {
 MODULE_DEVICE_TABLE(of, abx80x_of_match);
 #endif
 
+static int abx80x_i2c_probe(struct i2c_client *client)
+{
+	unsigned int part = (uintptr_t)i2c_get_match_data(client);
+	struct regmap *regmap;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		return -ENODEV;
+
+	regmap = devm_regmap_init_i2c(client, &abx80x_regmap_config_i2c);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Unable to allocate regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	return abx80x_probe(&client->dev, regmap, client->irq,
+			    client->dev.of_node, part);
+}
+
 static struct i2c_driver abx80x_driver = {
 	.driver		= {
 		.name	= "rtc-abx80x",
 		.of_match_table = of_match_ptr(abx80x_of_match),
 	},
-	.probe		= abx80x_probe,
+	.probe		= abx80x_i2c_probe,
 	.id_table	= abx80x_id,
 };
 
-module_i2c_driver(abx80x_driver);
+static int abx80x_register_driver(void)
+{
+	return i2c_add_driver(&abx80x_driver);
+}
+
+static void abx80x_unregister_driver(void)
+{
+	i2c_del_driver(&abx80x_driver);
+}
+
+#else
+
+static int abx80x_register_driver(void)
+{
+	return 0;
+}
+
+static void abx80x_unregister_driver(void)
+{
+}
+
+#endif /* IS_ENABLED(CONFIG_I2C) */
+
+static int __init abx80x_init(void)
+{
+	return abx80x_register_driver();
+}
+module_init(abx80x_init);
+
+static void __exit abx80x_exit(void)
+{
+	abx80x_unregister_driver();
+}
+module_exit(abx80x_exit);
 
 MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
-- 
2.55.0

[PATCH v3 8/8] rtc: abx80x: add support for ABX81X

[Antoni Pokusinski]

Abracon ABX81X is a family of RTCs with SPI interface featuring
the same functionalities as the ABX80X I2C clocks.

Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>
---
 drivers/rtc/Kconfig      |  26 +++++-----
 drivers/rtc/rtc-abx80x.c | 106 +++++++++++++++++++++++++++++++++++++--
 2 files changed, 115 insertions(+), 17 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 4d14bcba616e..d35221f81024 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -212,18 +212,6 @@ config RTC_DRV_ABEOZ9
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-ab-e0z9.
 
-config RTC_DRV_ABX80X
-	tristate "Abracon ABx80x"
-	select WATCHDOG_CORE if WATCHDOG
-	select REGMAP_I2C
-	help
-	  If you say yes here you get support for Abracon AB080X and AB180X
-	  families of ultra-low-power  battery- and capacitor-backed real-time
-	  clock chips.
-
-	  This driver can also be built as a module. If so, the module
-	  will be called rtc-abx80x.
-
 config RTC_DRV_AC100
 	tristate "X-Powers AC100"
 	depends on MFD_AC100
@@ -955,6 +943,20 @@ config RTC_I2C_AND_SPI
 
 comment "SPI and I2C RTC drivers"
 
+config RTC_DRV_ABX80X
+	tristate "Abracon ABx80x"
+	depends on RTC_I2C_AND_SPI
+	select WATCHDOG_CORE if WATCHDOG
+	select REGMAP_I2C if I2C
+	select REGMAP_SPI if SPI_MASTER
+	help
+	  If you say yes here you get support for Abracon AB080X, AB180X,
+	  AB081X and AB181X families of ultra-low-power  battery- and
+	  capacitor-backed real-time clock chips.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-abx80x.
+
 config RTC_DRV_DS3232
 	tristate "Dallas/Maxim DS3232/DS3234"
 	depends on RTC_I2C_AND_SPI
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 6583e097af68..e5116c034d04 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * A driver for the I2C members of the Abracon AB x8xx RTC family,
- * and compatible: AB 1805 and AB 0805
+ * A driver for the I2C and SPI members of the Abracon AB x8xx RTC family,
+ * and compatible: AB 1805, AB 0805, AB 1815 and AB 0815
  *
  * Copyright 2014-2015 Macq S.A.
  *
@@ -19,6 +19,7 @@
 #include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/rtc.h>
+#include <linux/spi/spi.h>
 #include <linux/watchdog.h>
 
 #define ABX8XX_REG_HTH		0x00
@@ -103,8 +104,8 @@
 
 static u8 trickle_resistors[] = {0, 3, 6, 11};
 
-enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
-	AB1801, AB1803, AB1804, AB1805, RV1805, ABX80X};
+enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, AB0815,
+	AB1801, AB1803, AB1804, AB1805, AB1815, RV1805, ABX80X};
 
 struct abx80x_cap {
 	u16 pn;
@@ -117,10 +118,12 @@ static struct abx80x_cap abx80x_caps[] = {
 	[AB0803] = {.pn = 0x0803},
 	[AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true},
 	[AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true},
+	[AB0815] = {.pn = 0x0815, .has_tc = true, .has_wdog = true},
 	[AB1801] = {.pn = 0x1801},
 	[AB1803] = {.pn = 0x1803},
 	[AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true},
 	[AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
+	[AB1815] = {.pn = 0x1815, .has_tc = true, .has_wdog = true},
 	[RV1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
 	[ABX80X] = {.pn = 0}
 };
@@ -1049,14 +1052,107 @@ static void abx80x_unregister_driver(void)
 
 #endif /* IS_ENABLED(CONFIG_I2C) */
 
+#if IS_ENABLED(CONFIG_SPI_MASTER)
+
+static const struct regmap_config abx80x_regmap_config_spi = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = ABX8XX_SRAM_BASE + ABX8XX_SRAM_WIN_SIZE - 1,
+
+	.rd_table = &abx80x_read_table,
+	.wr_table = &abx80x_write_table,
+
+	.write_flag_mask = BIT(7),
+};
+
+static const struct spi_device_id abx81x_id[] = {
+	{ "ab0815", AB0815 },
+	{ "ab1815", AB1815 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, abx81x_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id abx81x_of_match[] = {
+	{
+		.compatible = "abracon,ab0815",
+		.data = (void *)AB0815
+	},
+	{
+		.compatible = "abracon,ab1815",
+		.data = (void *)AB1815
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, abx81x_of_match);
+#endif
+
+static int abx81x_spi_probe(struct spi_device *spi)
+{
+	unsigned int part = (uintptr_t)spi_get_device_match_data(spi);
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_spi(spi, &abx80x_regmap_config_spi);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "Unable to allocate regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	return abx80x_probe(&spi->dev, regmap, spi->irq,
+			    spi->dev.of_node, part);
+}
+
+static struct spi_driver abx81x_driver = {
+	.driver		= {
+		.name	= "rtc-abx81x",
+		.of_match_table = of_match_ptr(abx81x_of_match),
+	},
+	.probe		= abx81x_spi_probe,
+	.id_table	= abx81x_id,
+};
+
+static int abx81x_register_driver(void)
+{
+	return spi_register_driver(&abx81x_driver);
+}
+
+static void abx81x_unregister_driver(void)
+{
+	spi_unregister_driver(&abx81x_driver);
+}
+
+#else
+
+static int abx81x_register_driver(void)
+{
+	return 0;
+}
+
+static void abx81x_unregister_driver(void)
+{
+}
+
+#endif /* IS_ENABLED(CONFIG_SPI_MASTER) */
+
 static int __init abx80x_init(void)
 {
-	return abx80x_register_driver();
+	int ret;
+
+	ret = abx80x_register_driver();
+	if (ret)
+		return ret;
+
+	ret = abx81x_register_driver();
+	if (ret)
+		abx80x_unregister_driver();
+
+	return ret;
 }
 module_init(abx80x_init);
 
 static void __exit abx80x_exit(void)
 {
+	abx81x_unregister_driver();
 	abx80x_unregister_driver();
 }
 module_exit(abx80x_exit);
-- 
2.55.0

Re: [PATCH v3 1/8] dt-bindings: rtc: abx80x: document ABX81X RTCs

[sashiko-bot]

> Abracon AB0815 and AB1815 are RTC modules with SPI interface.
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=1

Re: [PATCH v3 6/8] rtc: abx80x: replace read-modify-write pattern with regmap helpers

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider:
- [High] Using `guard(mutex)` inside a `switch` statement case without an enclosing block causes a compilation failure (or uninitialized cleanup execution).
- [High] Configuration Key unlock sequence is broken by unprotected concurrent reads and newly introduced read-modify-write regmap helpers.
--

--- Patch [6]: [PATCH v3 6/8] rtc: abx80x: replace read-modify-write pattern with regmap helpers ---
commit 68e1add63890d6b130ad7ce142d172f06e590b90
Author: Antoni Pokusinski <apokusinski01@gmail.com>

rtc: abx80x: replace read-modify-write pattern with regmap helpers

This commit replaces manual read-modify-write register operations in the 
rtc-abx80x driver with regmap_update_bits() and regmap_write_bits() 
functions to simplify the code.

> diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
> index 23823fc2f5458..52f958e2aecd2 100644
> --- a/drivers/rtc/rtc-abx80x.c
> +++ b/drivers/rtc/rtc-abx80x.c
[ ... ]
> @@ -371,7 +364,7 @@ static int abx80x_rtc_set_autocalibration(struct device *dev,
>  					  int autocalibration)
>  {
[ ... ]
>  	/* Unlock write access to Oscillator Control Register */
>  	if (abx80x_write_config_key(dev, ABX8XX_CFG_KEY_OSC) < 0)
>  		return -EIO;
>  
> -	retval = regmap_write(priv->regmap, ABX8XX_REG_OSC, flags);
> -
> -	return retval;
> +	return regmap_write_bits(priv->regmap, ABX8XX_REG_OSC,
> +				 ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512,
> +				 flags);
>  }

[Severity: High]
Does switching to regmap_write_bits() break the configuration key unlock
sequence here?

The hardware requires writing the configuration key immediately before 
writing a protected register. If any other register is accessed in between, 
the unlock state is cleared. 

Because regmap_write_bits() performs a read operation internally before 
writing, does that read happen after the configuration key is written,
causing the hardware to relock itself before the write can execute?

Additionally, can an unlocked concurrent read sequence interleave here and
clear the unlock state? Looking at abx80x_rtc_read_time(), it performs I2C 
reads without taking priv->lock:

abx80x_rtc_read_time() {
    ...
    err = regmap_bulk_read(priv->regmap, ABX8XX_REG_HTH, buf, sizeof(buf));
    ...
}

[ ... ]
> @@ -566,17 +545,8 @@ static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
>  	case RTC_VL_CLR:
>  		guard(mutex)(&priv->lock);
>  
> -		err = regmap_read(priv->regmap, ABX8XX_REG_STATUS, &status);
> -		if (err < 0)
> -			return err;
> -
> -		status &= ~ABX8XX_STATUS_BLF;
> -
> -		err = regmap_write(priv->regmap, ABX8XX_REG_STATUS, status);
> -		if (err < 0)
> -			return err;
> -
> -		return 0;
> +		return regmap_update_bits(priv->regmap, ABX8XX_REG_STATUS,
> +					  ABX8XX_STATUS_BLF, 0);
>  
>  	default:
>  		return -ENOIOCTLCMD;
>  	}

[Severity: High]
Will this cause a compiler error or undefined behavior?

The guard(mutex) is declared inside the case block, but without an 
enclosing scope. If cmd is an unhandled ioctl, the switch statement jumps 
to the default label, bypassing the initialization of the guard(mutex) 
variable. 

Does this require adding braces around the RTC_VL_CLR case to restrict the 
lifetime of the guard?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=6

Re: [PATCH v3 7/8] rtc: abx80x: create abx80x_i2c_probe()

[sashiko-bot]

> Move the I2C-specific code from abx80x_probe() to the newly created
> function. This is a preparation for introducing the support for
> ABX81X RTCs which use SPI interface.
> 
> Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=7

Re: [PATCH v3 2/8] rtc: abx80x: add mutex protection for register writes

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 3 potential issue(s) to consider:

New issues:
- [Low] Build failure due to jumping over a `__cleanup__` variable declaration in a switch statement.

Pre-existing issues:
- [High] Shared IRQ handler unconditionally returns IRQ_HANDLED and clears the status register, risking interrupt storms and breaking battery low detection.
- [High] Missing mutex protection on I2C reads allows them to interleave with and silently break multi-step configuration key write sequences.
--

--- Patch [2]: [PATCH v3 2/8] rtc: abx80x: add mutex protection for register writes ---
commit d3bc95e6c97e9f4f1dbb461f4986e984a4ccd25a
Author: Antoni Pokusinski <apokusinski01@gmail.com>

rtc: abx80x: add mutex protection for register writes

The ABX80X RTC driver performs multi-step register operations such as
NVMEM transfers or register writes preceded by a configuration key
write. Add a mutex to serialize all the register writes to protect
these sequences against race conditions.

> diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
> index 5486d9d0b1e5d..8d791b9ec7d21 100644
> --- a/drivers/rtc/rtc-abx80x.c
> +++ b/drivers/rtc/rtc-abx80x.c
[ ... ]
> @@ -219,6 +221,7 @@ static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)

[Severity: High]
This is a pre-existing issue, but should I2C reads like those performed in
abx80x_rtc_read_time() also be protected by the new mutex?

If an unprotected I2C read interleaves with a protected multi-step write
(such as abx80x_rtc_set_autocalibration()), it can reset the configuration
key on the hardware. This would cause the target register write to be
silently ignored.

>  static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
>  {
>  	struct i2c_client *client = to_i2c_client(dev);
[ ... ]
> @@ -263,6 +268,8 @@ static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
>  	struct rtc_device *rtc = priv->rtc;
>  	int status;
>  
> +	guard(mutex)(&priv->lock);
> +
>  	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
>  	if (status < 0)
>  		return IRQ_NONE;

[Severity: High]
This isn't a bug introduced by this patch, but does this interrupt handler
unconditionally clear the status register and return IRQ_HANDLED later in
the function?

If a shared device or spurious interrupt triggers abx80x_handle_irq(),
returning IRQ_HANDLED for unrelated interrupts prevents the core IRQ
subsystem from disabling a stuck shared line.

Additionally, writing 0 unconditionally clears all flags, including
ABX8XX_STATUS_BLF, which prevents userspace from detecting a low battery.

[ ... ]
> @@ -539,6 +559,8 @@ static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
>  		return put_user(tmp, (unsigned int __user *)arg);
>  
>  	case RTC_VL_CLR:
> +		guard(mutex)(&priv->lock);
> +

[Severity: Low]
Does this cause a build failure?

The guard macro declares a cleanup variable inside the switch statement
without a surrounding compound block. Any other ioctl command jumping to the
default label will bypass the variable's initialization, which GCC usually
flags as a hard error.

>  		status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
>  		if (status < 0)
>  			return status;

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=2

Re: [PATCH v3 4/8] rtc: abx80x: add irq to struct abx80x_priv

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider:

Pre-existing issues:
- [High] Read-modify-write of the status register introduces a race condition that loses interrupts.
- [High] Unconditional failure in `abx80x_read_alarm` due to incorrect handling of `i2c_smbus_read_i2c_block_data` return value.
--

--- Patch [4]: [PATCH v3 4/8] rtc: abx80x: add irq to struct abx80x_priv ---
commit be354d8ef94de08e1314876fad55888243ca019f
Author: Antoni Pokusinski <apokusinski01@gmail.com>

rtc: abx80x: add irq to struct abx80x_priv
    
This adds the irq field to struct abx80x_priv so the interrupt number is not
strictly tied to the i2c_client structure. This allows it to be more easily
accessed for ABX81X SPI clocks.

> diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
> --- a/drivers/rtc/rtc-abx80x.c
> +++ b/drivers/rtc/rtc-abx80x.c
> @@ -299,11 +300,12 @@ static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)

[Severity: High]
This is a pre-existing issue, but I noticed a potential race condition with
the status register.

In abx80x_handle_irq(), there is a read-modify-write sequence:

	status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
	...
	i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS,
				  status & ~(ABX8XX_STATUS_AF | ABX8XX_STATUS_WDT));

If a hardware interrupt (such as an RTC alarm or watchdog) sets a new flag
in ABX8XX_REG_STATUS exactly between the read and write calls, wouldn't the
write operation write back a 0 for the newly set bit and inadvertently clear
it without handling it?

This same pattern appears to be present in abx80x_ioctl() as well:

	tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS,
					status);

Could this cause hardware interrupts or status flags to be silently dropped?

>  static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
>  {
>  	struct i2c_client *client = to_i2c_client(dev);
> +	struct abx80x_priv *priv = i2c_get_clientdata(client);
>  	unsigned char buf[7];
>  
>  	int irq_mask, err;
>  
> -	if (client->irq <= 0)
> +	if (priv->irq <= 0)
>  		return -EINVAL;
>  
>  	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,

[Severity: High]
This isn't a bug introduced by this patch, but does this error check work
as intended?

i2c_smbus_read_i2c_block_data() returns the number of bytes read (which
would be 7) on success.

Looking at the code just below this in abx80x_read_alarm():

	err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
					    sizeof(buf), buf);
	if (err)
		return err;

Wouldn't this evaluate to true on a successful read, causing the function
to prematurely abort and pass the byte count back as an error code?

[ ... ]

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=4

Re: [PATCH v3 8/8] rtc: abx80x: add support for ABX81X

[sashiko-bot]

> Abracon ABX81X is a family of RTCs with SPI interface featuring
> the same functionalities as the ABX80X I2C clocks.
> 
> Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=8

Re: [PATCH v3 3/8] rtc: abx80x: properly handle shared IRQs

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [High] Returning IRQ_NONE without masking or clearing unhandled RTC interrupts can cause an interrupt storm on the shared IRQ line.
--

--- Patch [3]: [PATCH v3 3/8] rtc: abx80x: properly handle shared IRQs ---
commit e06155ed4aeb662277df57a2324e881c6d065e84
Author: Antoni Pokusinski <apokusinski01@gmail.com>

rtc: abx80x: properly handle shared IRQs

This commit modifies the abx80x interrupt handler to only claim the IRQ and
clear the status register if the alarm or watchdog flags are explicitly set.
It aims to prevent claiming interrupts from other devices sharing the same
IRQ line.

> diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
> --- a/drivers/rtc/rtc-abx80x.c
> +++ b/drivers/rtc/rtc-abx80x.c

[ ... ]

> @@ -266,27 +266,34 @@ static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)

[ ... ]

> -	if (status & ABX8XX_STATUS_WDT)
> +	if (status & ABX8XX_STATUS_WDT) {
>  		dev_alert(&client->dev, "watchdog timeout interrupt.\n");
> +		handled = IRQ_HANDLED;
> +	}
>  
> -	i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
> +	if (handled == IRQ_HANDLED)
> +		i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS,
> +					  status & ~(ABX8XX_STATUS_AF | ABX8XX_STATUS_WDT));
>  
> -	return IRQ_HANDLED;
> +	return handled;

[Severity: High]
If the RTC hardware asserts an interrupt for a reason other than AF or WDT
(for example, a timer or century interrupt left enabled by a bootloader),
will this cause an interrupt storm?

Because handled remains IRQ_NONE, the handler skips the i2c_smbus_write_byte_data()
call and returns IRQ_NONE without clearing the unhandled RTC status bits.

Since the unhandled RTC interrupt is never cleared, the IRQ line will remain
asserted. This causes the kernel to immediately re-enter the handler until
the spurious IRQ detector steps in and completely disables the shared IRQ line.

Could we check if the status register indicates the interrupt originated
from this RTC, clear those bits, and return IRQ_HANDLED?

>  }

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=3

Re: [PATCH v3 5/8] rtc: abx80x: use regmap instead of I2C specific API

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] Variables declared as `int` are passed by reference to `regmap_read`, which expects an `unsigned int *`.
--

--- Patch [5]: [PATCH v3 5/8] rtc: abx80x: use regmap instead of I2C specific API ---
commit 5bae78c37282c7d7693255ad432126ac7e8c51f8
Author: Antoni Pokusinski <apokusinski01@gmail.com>

rtc: abx80x: use regmap instead of I2C specific API

This commit reworks the abx80x RTC driver to use regmap API instead of 
i2c_smbus functions. This prepares the driver for future ABX81X SPI support.

> diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
> index 4ac3ace687a1e..23823fc2f5458 100644
> --- a/drivers/rtc/rtc-abx80x.c
> +++ b/drivers/rtc/rtc-abx80x.c

[ ... ]

> @@ -221,8 +224,7 @@ static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
>  
>  static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
>  {
> -	struct i2c_client *client = to_i2c_client(dev);
> -	struct abx80x_priv *priv = i2c_get_clientdata(client);
> +	struct abx80x_priv *priv = dev_get_drvdata(dev);
>  	unsigned char buf[8];
>  	int err, flags;
>  

[ ... ]

>  	/* Clear the OF bit of Oscillator Status Register */
> -	flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
> -	if (flags < 0)
> -		return flags;
> +	err = regmap_read(priv->regmap, ABX8XX_REG_OSS, &flags);

[Severity: Low]
Will this cause a compiler error on GCC 14+ due to incompatible pointer types?

The regmap_read() function expects an "unsigned int *" for its third argument,
but "flags" is declared as an "int" here.

It looks like this same issue with passing an "int *" to regmap_read() also
happens with the "flags" variable in abx80x_rtc_set_autocalibration() and
oscillator_store(), as well as with the "data" variable in abx80x_probe().

[ ... ]

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260731184831.44037-1-apokusinski01@gmail.com?part=5