rtc: pcf2127: handle boot-enabled watchdog feature (62409933) · Commits · 戴 / test

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>

drivers/rtc/rtc-pcf2127.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -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)

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