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1c2a2253f7
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>
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PCF85063 and compatible I2C RTC driver
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*
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* Copyright (c) 2025 Kontron Europe GmbH.
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*/
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#include <dm.h>
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#include <i2c.h>
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#include <rtc.h>
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#include <dm/device_compat.h>
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#define PCF85063_REG_CTRL1 0x00 /* status */
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#define PCF85063_REG_CTRL1_SR 0x58
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#define PCF85063_REG_SC 0x04 /* datetime */
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#define PCF85063_REG_SC_OS 0x80
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static int pcf85063_get_time(struct udevice *dev, struct rtc_time *tm)
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{
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u8 regs[7];
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int ret;
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ret = dm_i2c_read(dev, PCF85063_REG_SC, regs, sizeof(regs));
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if (ret)
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return ret;
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if (regs[0] & PCF85063_REG_SC_OS) {
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dev_err(dev, "Power loss detected, Invalid time\n");
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return -EINVAL;
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}
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tm->tm_sec = bcd2bin(regs[0] & 0x7f);
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tm->tm_min = bcd2bin(regs[1] & 0x7f);
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tm->tm_hour = bcd2bin(regs[2] & 0x3f);
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tm->tm_mday = bcd2bin(regs[3] & 0x3f);
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tm->tm_wday = regs[4] & 0x07;
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tm->tm_mon = bcd2bin(regs[5] & 0x1f) - 1;
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tm->tm_year = bcd2bin(regs[6]) + 2000;
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return 0;
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}
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static int pcf85063_set_time(struct udevice *dev, const struct rtc_time *tm)
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{
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u8 regs[7];
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if (tm->tm_year < 2000 || tm->tm_year > 2099) {
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dev_err(dev, "Year must be between 2000 and 2099.\n");
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return -EINVAL;
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}
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regs[0] = bin2bcd(tm->tm_sec);
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regs[1] = bin2bcd(tm->tm_min);
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regs[2] = bin2bcd(tm->tm_hour);
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regs[3] = bin2bcd(tm->tm_mday);
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regs[4] = tm->tm_wday;
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regs[5] = bin2bcd(tm->tm_mon + 1);
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regs[6] = bin2bcd(tm->tm_year % 100);
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return dm_i2c_write(dev, PCF85063_REG_SC, regs, sizeof(regs));
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}
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static int pcf85063_reset(struct udevice *dev)
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{
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return dm_i2c_reg_write(dev, PCF85063_REG_CTRL1, PCF85063_REG_CTRL1_SR);
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}
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static int pcf85063_read(struct udevice *dev, unsigned int offset, u8 *buf,
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unsigned int len)
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{
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return dm_i2c_read(dev, offset, buf, len);
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}
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static int pcf85063_write(struct udevice *dev, unsigned int offset,
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const u8 *buf, unsigned int len)
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{
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return dm_i2c_write(dev, offset, buf, len);
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}
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static const struct rtc_ops pcf85063_rtc_ops = {
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.get = pcf85063_get_time,
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.set = pcf85063_set_time,
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.reset = pcf85063_reset,
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.read = pcf85063_read,
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.write = pcf85063_write,
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};
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static int pcf85063_probe(struct udevice *dev)
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{
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i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS | DM_I2C_CHIP_WR_ADDRESS);
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return 0;
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}
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static const struct udevice_id pcf85063_of_id[] = {
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{ .compatible = "microcrystal,rv8263" },
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{ }
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};
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U_BOOT_DRIVER(rtc_pcf85063) = {
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.name = "rtc-pcf85063",
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.id = UCLASS_RTC,
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.probe = pcf85063_probe,
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.of_match = pcf85063_of_id,
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.ops = &pcf85063_rtc_ops,
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};
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