This can be used for device register access from board code.

This allows access to capabilities in the RTC chip not abstracted in U-Boot's RTC class. E.g., device NVRAM or a tamper detection circuit.

Cc: Klaus Goger klaus.goger@theobroma-systems.com Cc: Philipp Tomsich philipp.tomsich@theobroma-systems.com Cc: Simon Glass sjg@chromium.org Signed-off-by: Trent Piepho tpiepho@impinj.com --- drivers/rtc/isl1208.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)

diff --git a/drivers/rtc/isl1208.c b/drivers/rtc/isl1208.c index 22ac0d2b08..59a60b75b3 100644 --- a/drivers/rtc/isl1208.c +++ b/drivers/rtc/isl1208.c @@ -51,6 +51,24 @@ #define RTC_STAT_BIT_BAT 0x02 /* BATTERY BIT */ #define RTC_STAT_BIT_RTCF 0x01 /* REAL TIME CLOCK FAIL BIT */

+/* + * Read an RTC register + */ + +static int isl1208_rtc_read8(struct udevice *dev, unsigned int reg) +{ + return dm_i2c_reg_read(dev, reg); +} + +/* + * Write an RTC register + */ + +static int isl1208_rtc_write8(struct udevice *dev, unsigned int reg, int val) +{ + return dm_i2c_reg_write(dev, reg, val); +} + /* * Get the current time from the RTC */ @@ -161,6 +179,8 @@ static const struct rtc_ops isl1208_rtc_ops = { .get = isl1208_rtc_get, .set = isl1208_rtc_set, .reset = isl1208_rtc_reset, + .read8 = isl1208_rtc_read8, + .write8 = isl1208_rtc_write8, };

static const struct udevice_id isl1208_rtc_ids[] = {