linux-kernel - [PATCH v3] rtc: imxdi: add wakeup support

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Date:   Tue, 11 May 2021 18:12:44 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>
Cc:     linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Kaiser <martin@...ser.cx>
Subject: [PATCH v3] rtc: imxdi: add wakeup support

The DryIce-based RTC supports alarms that trigger an interrupt.

Configure this interrupt as a wakeup source that wakes the system up
from standby mode.

Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
v3:
 - fix the commit message, the interrupt is always a wakeup source

v2:
 - unconditionally declare rtc-imxdi as wakeup source
 - use dev_pm_set_wake_irq instead of manually coding suspend and resume

 drivers/rtc/rtc-imxdi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c
index c1806f4d68e7..4b712e5ab08a 100644
--- a/drivers/rtc/rtc-imxdi.c
+++ b/drivers/rtc/rtc-imxdi.c
@@ -24,6 +24,7 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/rtc.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
@@ -811,6 +812,9 @@ static int __init dryice_rtc_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, imxdi);
 
+	device_init_wakeup(&pdev->dev, true);
+	dev_pm_set_wake_irq(&pdev->dev, norm_irq);
+
 	imxdi->rtc->ops = &dryice_rtc_ops;
 	imxdi->rtc->range_max = U32_MAX;
 
-- 
2.20.1