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 --- clean travis build, see: https://travis-ci.org/hsdenx/u-boot-test/builds/537359553

drivers/rtc/ds1307.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)

diff --git a/drivers/rtc/ds1307.c b/drivers/rtc/ds1307.c index 48220b45db..a33f47525f 100644 --- a/drivers/rtc/ds1307.c +++ b/drivers/rtc/ds1307.c @@ -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 }, { } };