[PATCH v5 1/1] rtc: nuvoton: Compatible with NCT3015Y-R and NCT3018Y-R
From: Mia Lin
Date: Tue Sep 05 2023 - 12:36:19 EST
The NCT3015Y-R and NCT3018Y-R use the same datasheet
but have different topologies as follows.
- Topology (Only 1st i2c can set TWO bit and HF bit)
In NCT3015Y-R,
rtc 1st i2c is connected to a host CPU
rtc 2nd i2c is connected to a BMC
In NCT3018Y-R,
rtc 1st i2c is connected to a BMC
rtc 2nd i2c is connected to a host CPU
In order to be compatible with NCT3015Y-R and NCT3018Y-R,
- In probe,
If part number is NCT3018Y-R, only set HF bit to 24-Hour format.
Else, do nothing
- In set_time,
If part number is NCT3018Y-R && TWO bit is 0,
change TWO bit to 1, and restore TWO bit after updating time.
- Refine error messages to pinpoint the correct location.
Signed-off-by: Mia Lin <mimi05633@xxxxxxxxx>
---
drivers/rtc/rtc-nct3018y.c | 87 ++++++++++++++++++++++++++++----------
1 file changed, 64 insertions(+), 23 deletions(-)
diff --git a/drivers/rtc/rtc-nct3018y.c b/drivers/rtc/rtc-nct3018y.c
index a4e3f924837e..9ec20f241e15 100644
--- a/drivers/rtc/rtc-nct3018y.c
+++ b/drivers/rtc/rtc-nct3018y.c
@@ -23,6 +23,7 @@
#define NCT3018Y_REG_CTRL 0x0A /* timer control */
#define NCT3018Y_REG_ST 0x0B /* status */
#define NCT3018Y_REG_CLKO 0x0C /* clock out */
+#define NCT3018Y_REG_PART 0x21 /* part info */
#define NCT3018Y_BIT_AF BIT(7)
#define NCT3018Y_BIT_ST BIT(7)
@@ -37,6 +38,7 @@
#define NCT3018Y_REG_BAT_MASK 0x07
#define NCT3018Y_REG_CLKO_F_MASK 0x03 /* frequenc mask */
#define NCT3018Y_REG_CLKO_CKE 0x80 /* clock out enabled */
+#define NCT3018Y_REG_PART_NCT3018Y 0x02
struct nct3018y {
struct rtc_device *rtc;
@@ -46,6 +48,8 @@ struct nct3018y {
#endif
};
+static int part_num;
+
static int nct3018y_set_alarm_mode(struct i2c_client *client, bool on)
{
int err, flags;
@@ -55,7 +59,7 @@ static int nct3018y_set_alarm_mode(struct i2c_client *client, bool on)
flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CTRL);
if (flags < 0) {
dev_dbg(&client->dev,
- "Failed to read NCT3018Y_REG_CTRL\n");
+ "%s: Failed to read ctrl reg.\n", __func__);
return flags;
}
@@ -67,21 +71,21 @@ static int nct3018y_set_alarm_mode(struct i2c_client *client, bool on)
flags |= NCT3018Y_BIT_CIE;
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL\n");
+ dev_dbg(&client->dev, "%s: Unable to write ctrl reg.\n", __func__);
return err;
}
flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_ST);
if (flags < 0) {
dev_dbg(&client->dev,
- "Failed to read NCT3018Y_REG_ST\n");
+ "%s: Failed to read status reg.\n", __func__);
return flags;
}
flags &= ~(NCT3018Y_BIT_AF);
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_ST, flags);
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_ST\n");
+ dev_dbg(&client->dev, "%s: Unable to write status reg.\n", __func__);
return err;
}
@@ -155,7 +159,7 @@ static int nct3018y_rtc_read_time(struct device *dev, struct rtc_time *tm)
return err;
if (!buf[0]) {
- dev_dbg(&client->dev, " voltage <=1.7, date/time is not reliable.\n");
+ dev_dbg(&client->dev, "%s: voltage <=1.7, date/time is not reliable.\n", __func__);
return -EINVAL;
}
@@ -178,26 +182,44 @@ static int nct3018y_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct i2c_client *client = to_i2c_client(dev);
unsigned char buf[4] = {0};
- int err;
+ int err, flags;
+ int restore_flags = 0;
+
+ flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CTRL);
+ if (flags < 0) {
+ dev_dbg(&client->dev, "%s: Failed to read ctrl reg.\n", __func__);
+ return flags;
+ }
+
+ /* Check and set TWO bit */
+ if ((part_num & NCT3018Y_REG_PART_NCT3018Y) && !(flags & NCT3018Y_BIT_TWO)) {
+ restore_flags = 1;
+ flags |= NCT3018Y_BIT_TWO;
+ err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
+ if (err < 0) {
+ dev_dbg(&client->dev, "%s: Unable to write ctrl reg.\n", __func__);
+ return err;
+ }
+ }
buf[0] = bin2bcd(tm->tm_sec);
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_SC, buf[0]);
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_SC\n");
+ dev_dbg(&client->dev, "%s: Unable to write seconds reg.\n", __func__);
return err;
}
buf[0] = bin2bcd(tm->tm_min);
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_MN, buf[0]);
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_MN\n");
+ dev_dbg(&client->dev, "%s: Unable to write minutes reg.\n", __func__);
return err;
}
buf[0] = bin2bcd(tm->tm_hour);
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_HR, buf[0]);
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_HR\n");
+ dev_dbg(&client->dev, "%s: Unable to write hour reg.\n", __func__);
return err;
}
@@ -208,10 +230,22 @@ static int nct3018y_rtc_set_time(struct device *dev, struct rtc_time *tm)
err = i2c_smbus_write_i2c_block_data(client, NCT3018Y_REG_DW,
sizeof(buf), buf);
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write for day and mon and year\n");
+ dev_dbg(&client->dev, "%s: Unable to write for day and mon and year.\n", __func__);
return -EIO;
}
+ /* Restore TWO bit */
+ if (restore_flags) {
+ if (part_num & NCT3018Y_REG_PART_NCT3018Y)
+ flags &= ~NCT3018Y_BIT_TWO;
+
+ err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
+ if (err < 0) {
+ dev_dbg(&client->dev, "%s: Unable to write ctrl reg.\n", __func__);
+ return err;
+ }
+ }
+
return err;
}
@@ -224,7 +258,7 @@ static int nct3018y_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
err = i2c_smbus_read_i2c_block_data(client, NCT3018Y_REG_SCA,
sizeof(buf), buf);
if (err < 0) {
- dev_dbg(&client->dev, "Unable to read date\n");
+ dev_dbg(&client->dev, "%s: Unable to read date.\n", __func__);
return -EIO;
}
@@ -257,19 +291,19 @@ static int nct3018y_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_SCA, bin2bcd(tm->time.tm_sec));
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_SCA\n");
+ dev_dbg(&client->dev, "%s: Unable to write seconds alarm reg.\n", __func__);
return err;
}
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_MNA, bin2bcd(tm->time.tm_min));
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_MNA\n");
+ dev_dbg(&client->dev, "%s: Unable to write minutes alarm reg.\n", __func__);
return err;
}
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_HRA, bin2bcd(tm->time.tm_hour));
if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_HRA\n");
+ dev_dbg(&client->dev, "%s: Unable to write hour alarm reg.\n", __func__);
return err;
}
@@ -473,23 +507,29 @@ static int nct3018y_probe(struct i2c_client *client)
flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CTRL);
if (flags < 0) {
- dev_dbg(&client->dev, "%s: read error\n", __func__);
+ dev_dbg(&client->dev, "%s: Failed to read ctrl reg.\n", __func__);
return flags;
} else if (flags & NCT3018Y_BIT_TWO) {
- dev_dbg(&client->dev, "%s: NCT3018Y_BIT_TWO is set\n", __func__);
+ dev_dbg(&client->dev, "%s: TWO bit is set.\n", __func__);
}
- flags = NCT3018Y_BIT_TWO;
- err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
- if (err < 0) {
- dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL\n");
- return err;
+ part_num = i2c_smbus_read_byte_data(client, NCT3018Y_REG_PART);
+ if (part_num < 0) {
+ dev_dbg(&client->dev, "%s: Failed to read part info reg.\n", __func__);
+ return part_num;
+ } else if (part_num & NCT3018Y_REG_PART_NCT3018Y) {
+ flags = NCT3018Y_BIT_HF;
+ err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
+ if (err < 0) {
+ dev_dbg(&client->dev, "%s: Unable to write ctrl reg.\n", __func__);
+ return err;
+ }
}
flags = 0;
err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_ST, flags);
if (err < 0) {
- dev_dbg(&client->dev, "%s: write error\n", __func__);
+ dev_dbg(&client->dev, "%s: Failed to clear status reg.\n", __func__);
return err;
}
@@ -507,7 +547,8 @@ static int nct3018y_probe(struct i2c_client *client)
IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
"nct3018y", client);
if (err) {
- dev_dbg(&client->dev, "unable to request IRQ %d\n", client->irq);
+ dev_dbg(&client->dev, "%s: Unable to request IRQ %d.\n",
+ __func__, client->irq);
return err;
}
} else {
--
2.17.1