diff options
Diffstat (limited to 'drivers/rtc/m41t62.c')
| -rw-r--r-- | drivers/rtc/m41t62.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/rtc/m41t62.c b/drivers/rtc/m41t62.c index 94f2e0f332d..2ee7e00b021 100644 --- a/drivers/rtc/m41t62.c +++ b/drivers/rtc/m41t62.c @@ -1,5 +1,8 @@ // SPDX-License-Identifier: GPL-2.0+ /* + * (C) Copyright 2018 + * Lukasz Majewski, DENX Software Engineering, lukma@denx.de. + * * (C) Copyright 2008 * Stefan Roese, DENX Software Engineering, sr@denx.de. * @@ -15,6 +18,7 @@ #include <common.h> #include <command.h> +#include <dm.h> #include <rtc.h> #include <i2c.h> @@ -99,6 +103,78 @@ static void m41t62_set_rtc_buf(const struct rtc_time *tm, u8 *buf) buf[M41T62_REG_YEAR] = bin2bcd(tm->tm_year % 100); } +#ifdef CONFIG_DM_RTC +static int m41t62_rtc_get(struct udevice *dev, struct rtc_time *tm) +{ + u8 buf[M41T62_DATETIME_REG_SIZE]; + int ret; + + ret = dm_i2c_read(dev, 0, buf, sizeof(buf)); + if (ret) + return ret; + + m41t62_update_rtc_time(tm, buf); + + return 0; +} + +static int m41t62_rtc_set(struct udevice *dev, const struct rtc_time *tm) +{ + u8 buf[M41T62_DATETIME_REG_SIZE]; + int ret; + + ret = dm_i2c_read(dev, 0, buf, sizeof(buf)); + if (ret) + return ret; + + m41t62_set_rtc_buf(tm, buf); + + ret = dm_i2c_write(dev, 0, buf, sizeof(buf)); + if (ret) { + printf("I2C write failed in %s()\n", __func__); + return ret; + } + + return 0; +} + +static int m41t62_rtc_reset(struct udevice *dev) +{ + u8 val; + + /* + * M41T82: Make sure HT (Halt Update) bit is cleared. + * This bit is 0 in M41T62 so its save to clear it always. + */ + + int ret = dm_i2c_read(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val)); + + val &= ~M41T80_ALHOUR_HT; + ret |= dm_i2c_write(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val)); + + return ret; +} + +static const struct rtc_ops m41t62_rtc_ops = { + .get = m41t62_rtc_get, + .set = m41t62_rtc_set, + .reset = m41t62_rtc_reset, +}; + +static const struct udevice_id m41t62_rtc_ids[] = { + { .compatible = "st,m41t62" }, + { .compatible = "microcrystal,rv4162" }, + { } +}; + +U_BOOT_DRIVER(rtc_m41t62) = { + .name = "rtc-m41t62", + .id = UCLASS_RTC, + .of_match = m41t62_rtc_ids, + .ops = &m41t62_rtc_ops, +}; + +#else /* NON DM RTC code - will be removed */ int rtc_get(struct rtc_time *tm) { u8 buf[M41T62_DATETIME_REG_SIZE]; @@ -137,3 +213,4 @@ void rtc_reset(void) val &= ~M41T80_ALHOUR_HT; i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1); } +#endif /* CONFIG_DM_RTC */ |