On Fri, 21 Jun 2019 12:17:00 +0800 Chuanhua Han chuanhua.han@nxp.com wrote:
Add an implementation of the ds3231 driver that uses the driver model i2c APIs.
Signed-off-by: Chuanhua Han chuanhua.han@nxp.com
Changes in v3:
- Update copyright information.
Changes in v2: - Replace "#ifndef CONFIG_DM_RTC" with "#if !CONFIG_IS_ENABLED(DM_RTC)"
drivers/rtc/ds3231.c | 108 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+)
diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c index 9352ff87a2..86f1c3e899 100644 --- a/drivers/rtc/ds3231.c +++ b/drivers/rtc/ds3231.c @@ -2,6 +2,9 @@ /*
- (C) Copyright 2006
- Markus Klotzbuecher, mk@denx.de
- (C) Copyright 2019 NXP
*/
- Chuanhua Han chuanhua.han@nxp.com
/* @@ -13,6 +16,7 @@
#include <common.h> #include <command.h> +#include <dm.h> #include <rtc.h> #include <i2c.h>
@@ -50,6 +54,7 @@ #define RTC_STAT_BIT_EN32KHZ 0x8 /* Enable 32KHz Output */
+#if !CONFIG_IS_ENABLED(DM_RTC) static uchar rtc_read (uchar reg); static void rtc_write (uchar reg, uchar val);
@@ -164,3 +169,106 @@ static void rtc_write (uchar reg, uchar val) { i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); } +#else +static int ds3231_rtc_get(struct udevice *dev, struct rtc_time *tmp) +{
- int rel = 0;
- uchar sec, min, hour, mday, wday, mon_cent, year, status;
- status = dm_i2c_reg_read(dev, RTC_STAT_REG_ADDR);
- sec = dm_i2c_reg_read(dev, RTC_SEC_REG_ADDR);
- min = dm_i2c_reg_read(dev, RTC_MIN_REG_ADDR);
- hour = dm_i2c_reg_read(dev, RTC_HR_REG_ADDR);
- wday = dm_i2c_reg_read(dev, RTC_DAY_REG_ADDR);
- mday = dm_i2c_reg_read(dev, RTC_DATE_REG_ADDR);
- mon_cent = dm_i2c_reg_read(dev, RTC_MON_REG_ADDR);
- year = dm_i2c_reg_read(dev, RTC_YR_REG_ADDR);
- if (status & RTC_STAT_BIT_OSF) {
printf("### Warning: RTC oscillator has stopped\n");/* clear the OSF flag */dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR,dm_i2c_reg_read(dev,RTC_STAT_REG_ADDR)
& ~RTC_STAT_BIT_OSF);rel = -1;
A few remarks regarding above code:
1. By conversion we do use 'ret' instead of 'rel'. Is the 'rel' name itself here important?
2. The OSF bit - why shall we return from ds3231_rtc_get() with -1 (by convention it is an error) if this flag is set?
3. The '-1' value does not show the real reason for the error. Maybe some standard value (like e.g. -EINVAL, -ENODEV, -EIO) from errno.h would be more appropriate?
- }
- tmp->tm_sec = bcd2bin(sec & 0x7F);
- tmp->tm_min = bcd2bin(min & 0x7F);
- tmp->tm_hour = bcd2bin(hour & 0x3F);
- tmp->tm_mday = bcd2bin(mday & 0x3F);
- tmp->tm_mon = bcd2bin(mon_cent & 0x1F);
- tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 2000 :
1900);
- tmp->tm_wday = bcd2bin((wday - 1) & 0x07);
- tmp->tm_yday = 0;
- tmp->tm_isdst = 0;
- debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME:
%2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,tmp->tm_hour, tmp->tm_min, tmp->tm_sec);- return rel;
+}
+static int ds3231_rtc_set(struct udevice *dev, const struct rtc_time *tmp) +{
- uchar century;
- debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME:
%2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,tmp->tm_hour, tmp->tm_min, tmp->tm_sec);- dm_i2c_reg_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year
% 100)); +
- century = (tmp->tm_year >= 2000) ? 0x80 : 0;
- dm_i2c_reg_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon)
| century); +
- dm_i2c_reg_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday
- 1));
- dm_i2c_reg_write(dev, RTC_DATE_REG_ADDR,
bin2bcd(tmp->tm_mday));
- dm_i2c_reg_write(dev, RTC_HR_REG_ADDR,
bin2bcd(tmp->tm_hour));
- dm_i2c_reg_write(dev, RTC_MIN_REG_ADDR,
bin2bcd(tmp->tm_min));
- dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
bin2bcd(tmp->tm_sec)); +
- return 0;
+}
+static int ds3231_rtc_reset(struct udevice *dev) +{
- int ret;
- ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR,
RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2);- if (ret < 0)
return ret;- return 0;
+}
+static int ds3231_probe(struct udevice *dev) +{
- i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
DM_I2C_CHIP_WR_ADDRESS);- return 0;
+}
+static const struct rtc_ops ds3231_rtc_ops = {
- .get = ds3231_rtc_get,
- .set = ds3231_rtc_set,
- .reset = ds3231_rtc_reset,
+};
+static const struct udevice_id ds3231_rtc_ids[] = {
- { .compatible = "dallas,ds3231" },
- { .compatible = "dallas,ds3232" },
- { }
+};
+U_BOOT_DRIVER(rtc_ds3231) = {
- .name = "rtc-ds3231",
- .id = UCLASS_RTC,
- .probe = ds3231_probe,
- .of_match = ds3231_rtc_ids,
- .ops = &ds3231_rtc_ops,
+}; +#endif
Best regards,
Lukasz Majewski
--
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