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rtc: ti-k3: Add support to resume from IO DDR low power mode

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Restore the RTC HW context which may be lost when system enters
certain low power mode (IO+DDR mode).
Check if the RTC registers are locked which would indicate loss of
context (reset) and restore the context as needed.

Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://patch.msgid.link/20260313111740.1492519-1-a-kaur@ti.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Akashdeep Kaur 2026-03-13 16:47:40 +05:30 committed by Alexandre Belloni
parent e9f850ba66
commit 0e9b12ee74
1 changed files with 9 additions and 1 deletions
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10
drivers/rtc/rtc-ti-k3.c
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@ -640,10 +640,18 @@ static int __maybe_unused ti_k3_rtc_suspend(struct device *dev)
static int __maybe_unused ti_k3_rtc_resume(struct device *dev)
{
struct ti_k3_rtc *priv = dev_get_drvdata(dev);
int ret = 0;
if (k3rtc_check_unlocked(priv)) {
/* RTC locked implies low power mode exit where RTC loses context */
ret = k3rtc_configure(dev);
if (ret)
return ret;
}
if (device_may_wakeup(dev))
disable_irq_wake(priv->irq);
return 0;
return ret;
}
static SIMPLE_DEV_PM_OPS(ti_k3_rtc_pm_ops, ti_k3_rtc_suspend, ti_k3_rtc_resume);