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rtc: pcf2127: handle boot-enabled watchdog feature 

Linux should handle when the pcf2127 watchdog feature is enabled by the
bootloader. This is done by checking the watchdog timer value during
init, and set the WDOG_HW_RUNNING flag if the value differs from zero.

Signed-off-by: Martin Hundebøll <martin@geanix.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20191021080838.2789-1-martin@geanix.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Martin Hundebøll 2019-10-21 10:08:38 +02:00 committed by Alexandre Belloni
parent f583c341a5
commit 62409933b8
1 changed files with 9 additions and 1 deletions
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10
drivers/rtc/rtc-pcf2127.c
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@ -417,6 +417,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
const char *name, bool has_nvmem)
{
struct pcf2127 *pcf2127;
u32 wdd_timeout;
int ret = 0;
dev_dbg(dev, "%s\n", __func__);
@ -459,7 +460,6 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
/*
* Watchdog timer enabled and reset pin /RST activated when timed out.
* Select 1Hz clock source for watchdog timer.
* Timer is not started until WD_VAL is loaded with a valid value.
* Note: Countdown timer disabled and not available.
*/
ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
@ -475,6 +475,14 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
return ret;
}
/* Test if watchdog timer is started by bootloader */
ret = regmap_read(pcf2127->regmap, PCF2127_REG_WD_VAL, &wdd_timeout);
if (ret)
return ret;
if (wdd_timeout)
set_bit(WDOG_HW_RUNNING, &pcf2127->wdd.status);
#ifdef CONFIG_WATCHDOG
ret = devm_watchdog_register_device(dev, &pcf2127->wdd);
if (ret)