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rtc: Add read8 and write8 support to isl1208 driver

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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>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
This commit is contained in:
Trent Piepho 2018-05-31 11:14:44 -07:00 committed by Tom Rini
parent 0a60a81ba3
commit 4a094725b4
1 changed files with 20 additions and 0 deletions
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20
drivers/rtc/isl1208.c
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@ -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[] = {