diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index f8421e3bf58..ef1663f3450 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -194,6 +194,13 @@ config RTC_RV3029 This driver supports reading and writing the RTC/calendar and the battery-baced SRAM section. +config RTC_RV3032 + bool "Enable RV3032 driver" + depends on DM_RTC + help + If you say yes here you get support for the Micro Crystal RV3032 + RTC. + config RTC_RV8803 bool "Enable RV8803 driver" depends on DM_RTC diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 9d84aa836a1..9df373d5148 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_RTC_PL031) += pl031.o obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o obj-$(CONFIG_RTC_RV3028) += rv3028.o obj-$(CONFIG_RTC_RV3029) += rv3029.o +obj-$(CONFIG_RTC_RV3032) += rv3032.o obj-$(CONFIG_RTC_RV8803) += rv8803.o obj-$(CONFIG_RTC_RX8025) += rx8025.o obj-$(CONFIG_RTC_RX8010SJ) += rx8010sj.o diff --git a/drivers/rtc/rv3032.c b/drivers/rtc/rv3032.c new file mode 100644 index 00000000000..87ff5204e73 --- /dev/null +++ b/drivers/rtc/rv3032.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Micro Crystal RV3032 I2C RTC driver + * + * Copyright (c) 2025 Kontron Europe GmbH. + */ + +#include +#include +#include +#include + +#define RV3032_REG_SEC 0x01 +#define RV3032_REG_STATUS 0x0d +#define RV3032_REG_STATUS_VLF BIT(0) +#define RV3032_REG_STATUS_PORF BIT(1) + +static int rv3032_get_time(struct udevice *dev, struct rtc_time *tm) +{ + int ret, status; + u8 regs[7]; + + status = dm_i2c_reg_read(dev, RV3032_REG_STATUS); + if (status < 0) + return status; + + if (status & (RV3032_REG_STATUS_PORF | RV3032_REG_STATUS_VLF)) { + dev_err(dev, "Power loss detected, Invalid time\n"); + return -EINVAL; + } + + ret = dm_i2c_read(dev, RV3032_REG_SEC, regs, sizeof(regs)); + if (ret) + return ret; + + tm->tm_sec = bcd2bin(regs[0] & 0x7f); + tm->tm_min = bcd2bin(regs[1] & 0x7f); + tm->tm_hour = bcd2bin(regs[2] & 0x3f); + tm->tm_mday = bcd2bin(regs[3] & 0x3f); + tm->tm_wday = regs[4] & 0x07; + tm->tm_mon = bcd2bin(regs[5] & 0x1f) - 1; + tm->tm_year = bcd2bin(regs[6]) + 2000; + + return 0; +} + +static int rv3032_set_time(struct udevice *dev, const struct rtc_time *tm) +{ + u8 regs[7]; + int ret; + + if (tm->tm_year < 2000 || tm->tm_year > 2099) { + dev_err(dev, "Year must be between 2000 and 2099.\n"); + return -EINVAL; + } + + regs[0] = bin2bcd(tm->tm_sec); + regs[1] = bin2bcd(tm->tm_min); + regs[2] = bin2bcd(tm->tm_hour); + regs[3] = bin2bcd(tm->tm_mday); + regs[4] = tm->tm_wday; + regs[5] = bin2bcd(tm->tm_mon + 1); + regs[6] = bin2bcd(tm->tm_year % 100); + + ret = dm_i2c_write(dev, RV3032_REG_SEC, regs, sizeof(regs)); + if (ret) + return ret; + + return dm_i2c_reg_clrset(dev, RV3032_REG_STATUS, + RV3032_REG_STATUS_PORF | RV3032_REG_STATUS_VLF, + 0); +} + +static int rv3032_read(struct udevice *dev, unsigned int offset, u8 *buf, + unsigned int len) +{ + return dm_i2c_read(dev, offset, buf, len); +} + +static int rv3032_write(struct udevice *dev, unsigned int offset, + const u8 *buf, unsigned int len) +{ + return dm_i2c_write(dev, offset, buf, len); +} + +static int rv3032_reset(struct udevice *dev) +{ + /* + * There is no reset, but the "date reset" command needs this op to + * actually set the default time + */ + return 0; +} + +static const struct rtc_ops rv3032_rtc_ops = { + .get = rv3032_get_time, + .set = rv3032_set_time, + .read = rv3032_read, + .write = rv3032_write, + .reset = rv3032_reset, +}; + +static int rv3032_probe(struct udevice *dev) +{ + i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS | DM_I2C_CHIP_WR_ADDRESS); + + return 0; +} + +static const struct udevice_id rv3032_of_id[] = { + { .compatible = "microcrystal,rv3032" }, + { } +}; + +U_BOOT_DRIVER(rtc_rv3032) = { + .name = "rtc-rv3032", + .id = UCLASS_RTC, + .probe = rv3032_probe, + .of_match = rv3032_of_id, + .ops = &rv3032_rtc_ops, +};