drivers: rtc: add PCF85063 support

Add support for the Microcrystal RV8263 and compatible RTCs. The
driver's name was taken from linux. It should work with any NXP PCF85063
compatible RTCs. It was tested with a RV8263.

Signed-off-by: Michael Walle <mwalle@kernel.org>

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 202daa7bcd6e8ec38aa87949701657ad069d041a..f8421e3bf58e72059c05f56e576b223e89e79a3f 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -161,6 +161,14 @@ config RTC_MAX313XX
          - Temperature sensor
          - CLKOUT generation
 
+config RTC_PCF85063
+       bool "Enable PCF85063 driver"
+       depends on DM_I2C
+       depends on DM_RTC
+       help
+         If you say yes here you get support for the NXP PCF85063 RTC
+         and compatible chips.
+
 config RTC_PCF8563
        bool "Philips PCF8563"
        help

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index a4ede413cd17f11d46363c99b1e6b1ce1fa32bb1..9d84aa836a1d098ef72e7dd0367fdee19d286b97 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_RTC_MC146818) += mc146818.o
 obj-$(CONFIG_MCFRTC) += mcfrtc.o
 obj-$(CONFIG_RTC_MV) += mvrtc.o
 obj-$(CONFIG_RTC_MXS) += mxsrtc.o
+obj-$(CONFIG_RTC_PCF85063) += pcf85063.o
 obj-$(CONFIG_RTC_PCF8563) += pcf8563.o
 obj-$(CONFIG_RTC_PCF2127) += pcf2127.o
 obj-$(CONFIG_RTC_PL031) += pl031.o

diff --git a/drivers/rtc/pcf85063.c b/drivers/rtc/pcf85063.c
new file mode 100644 (file)
index 0000000..737d454
--- /dev/null
+++ b/drivers/rtc/pcf85063.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PCF85063 and compatible I2C RTC driver
+ *
+ * Copyright (c) 2025 Kontron Europe GmbH.
+ */
+
+#include <dm.h>
+#include <i2c.h>
+#include <rtc.h>
+#include <dm/device_compat.h>
+
+#define PCF85063_REG_CTRL1             0x00 /* status */
+#define PCF85063_REG_CTRL1_SR          0x58
+
+#define PCF85063_REG_SC                        0x04 /* datetime */
+#define PCF85063_REG_SC_OS             0x80
+
+static int pcf85063_get_time(struct udevice *dev, struct rtc_time *tm)
+{
+       u8 regs[7];
+       int ret;
+
+       ret = dm_i2c_read(dev, PCF85063_REG_SC, regs, sizeof(regs));
+       if (ret)
+               return ret;
+
+       if (regs[0] & PCF85063_REG_SC_OS) {
+               dev_err(dev, "Power loss detected, Invalid time\n");
+               return -EINVAL;
+       }
+
+       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 pcf85063_set_time(struct udevice *dev, const struct rtc_time *tm)
+{
+       u8 regs[7];
+
+       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);
+
+       return dm_i2c_write(dev, PCF85063_REG_SC, regs, sizeof(regs));
+}
+
+static int pcf85063_reset(struct udevice *dev)
+{
+       return dm_i2c_reg_write(dev, PCF85063_REG_CTRL1, PCF85063_REG_CTRL1_SR);
+}
+
+static int pcf85063_read(struct udevice *dev, unsigned int offset, u8 *buf,
+                        unsigned int len)
+{
+       return dm_i2c_read(dev, offset, buf, len);
+}
+
+static int pcf85063_write(struct udevice *dev, unsigned int offset,
+                         const u8 *buf, unsigned int len)
+{
+       return dm_i2c_write(dev, offset, buf, len);
+}
+
+static const struct rtc_ops pcf85063_rtc_ops = {
+       .get = pcf85063_get_time,
+       .set = pcf85063_set_time,
+       .reset = pcf85063_reset,
+       .read = pcf85063_read,
+       .write = pcf85063_write,
+};
+
+static int pcf85063_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 pcf85063_of_id[] = {
+       { .compatible = "microcrystal,rv8263" },
+       { }
+};
+
+U_BOOT_DRIVER(rtc_pcf85063) = {
+       .name   = "rtc-pcf85063",
+       .id     = UCLASS_RTC,
+       .probe  = pcf85063_probe,
+       .of_match = pcf85063_of_id,
+       .ops    = &pcf85063_rtc_ops,
+};