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drivers: rtc-pm8xxx: Add support for DeepSleep in RTC driver

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Add support for the DeepSleep mode for the RTC driver that
can be enabled based on a DT property.

Change-Id: Id7aab2a1affe26a71194aee0de78e116f1d803a0
Signed-off-by: LADI RAM SAI <quic_lramsai@quicinc.com>
This commit is contained in:
LADI RAM SAI 2023-12-21 15:14:53 +05:30
parent d3b1f3c1f6
commit 23870cd72f
1 changed files with 26 additions and 0 deletions
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26
drivers/rtc/rtc-pm8xxx.c
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@ -11,6 +11,7 @@
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/suspend.h>
/* RTC Register offsets from RTC CTRL REG */
#define PM8XXX_ALARM_CTRL_OFFSET 0x01
@ -54,6 +55,7 @@ struct pm8xxx_rtc_regs {
* @regs: rtc registers description.
* @rtc_dev: device structure.
* @ctrl_reg_lock: spinlock protecting access to ctrl_reg.
* @deepsleep_support: deepsleep_support used to check the status of enablement
*/
struct pm8xxx_rtc {
struct rtc_device *rtc;
@ -63,6 +65,7 @@ struct pm8xxx_rtc {
const struct pm8xxx_rtc_regs *regs;
struct device *rtc_dev;
spinlock_t ctrl_reg_lock;
bool deepsleep_support;
};
/*
@ -534,6 +537,9 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
return rc;
}
if (of_property_read_bool(pdev->dev.of_node, "qcom,support-deepsleep"))
rtc_dd->deepsleep_support = true;
return 0;
}
@ -571,9 +577,29 @@ static int pm8xxx_remove(struct platform_device *pdev)
return 0;
}
static int pm8xxx_rtc_resume(struct device *dev)
{
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
if (rtc_dd->deepsleep_support && (pm_suspend_target_state == PM_SUSPEND_MEM))
return pm8xxx_rtc_restore(dev);
return 0;
}
static int pm8xxx_rtc_suspend(struct device *dev)
{
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
if (rtc_dd->deepsleep_support && (pm_suspend_target_state == PM_SUSPEND_MEM))
return pm8xxx_rtc_freeze(dev);
return 0;
}
static const struct dev_pm_ops pm8xxx_rtc_pm_ops = {
.freeze = pm8xxx_rtc_freeze,
.restore = pm8xxx_rtc_restore,
.suspend = pm8xxx_rtc_suspend,
.resume = pm8xxx_rtc_resume,
};
static struct platform_driver pm8xxx_rtc_driver = {