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rtc: ds1307: add support for m41t11

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add m41t11 support in ds1307 driver. changes:

- add compatible string for m41t11
- check if RTC clock is running, if not
  enable the clock

Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher 2019-05-27 08:13:41 +02:00 committed by Tom Rini
parent d66fb5b1f6
commit 8dd6803ded
1 changed files with 14 additions and 0 deletions
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14
drivers/rtc/ds1307.c
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@ -23,6 +23,7 @@ enum ds_type {
ds_1307,
ds_1337,
ds_1340,
m41t11,
mcp794xx,
};
@ -260,6 +261,18 @@ read_rtc:
}
}
if (type == m41t11) {
/* clock halted? turn it on, so clock can tick. */
if (buf[RTC_SEC_REG_ADDR] & RTC_SEC_BIT_CH) {
buf[RTC_SEC_REG_ADDR] &= ~RTC_SEC_BIT_CH;
dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
MCP7941X_BIT_ST);
dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR,
buf[RTC_SEC_REG_ADDR]);
goto read_rtc;
}
}
if (type == mcp794xx) {
/* make sure that the backup battery is enabled */
if (!(buf[RTC_DAY_REG_ADDR] & MCP7941X_BIT_VBATEN)) {
@ -332,6 +345,7 @@ static const struct udevice_id ds1307_rtc_ids[] = {
{ .compatible = "dallas,ds1337", .data = ds_1337 },
{ .compatible = "dallas,ds1340", .data = ds_1340 },
{ .compatible = "microchip,mcp7941x", .data = mcp794xx },
{ .compatible = "st,m41t11", .data = m41t11 },
{ }
};