From: Mike Looijmans <mike.looijmans@topic.nl>
Date: Mon, 21 Aug 2023 07:20:13 +0000 (+0200)
Subject: rtc: pcf85363: Allow to wake up system without IRQ
X-Git-Tag: v6.5.12~94
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e9051bf642eba05e00218bbd03968e64c36bfc2;p=thirdparty%2Fkernel%2Fstable.git

rtc: pcf85363: Allow to wake up system without IRQ

[ Upstream commit 1e786b03705938870dafb629f2248f88d507a0ff ]

When wakeup-source is set in the devicetree, set up the device for
using the output as interrupt instead of clock. This is similar to
how other RTC devices handle this.

This allows the clock chip to turn on the board when wired to do
so in hardware.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Link: https://lore.kernel.org/r/20230821072013.7072-1-mike.looijmans@topic.nl
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Stable-dep-of: 2be36c09b6b0 ("rtc: pcf85363: fix wrong mask/val parameters in regmap_update_bits call")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c
index 65b8b1338dbb0..b2b7ea32b961f 100644
--- a/drivers/rtc/rtc-pcf85363.c
+++ b/drivers/rtc/rtc-pcf85363.c
@@ -403,6 +403,7 @@ static int pcf85363_probe(struct i2c_client *client)
 		},
 	};
 	int ret, i, err;
+	bool wakeup_source;
 
 	if (data)
 		config = data;
@@ -432,25 +433,36 @@ static int pcf85363_probe(struct i2c_client *client)
 	pcf85363->rtc->ops = &rtc_ops;
 	pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099;
-	clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
+
+	wakeup_source = device_property_read_bool(&client->dev,
+						  "wakeup-source");
+	if (client->irq > 0 || wakeup_source) {
+		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
+		regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
+				   PIN_IO_INTA_OUT, PIN_IO_INTAPM);
+	}
 
 	if (client->irq > 0) {
 		unsigned long irqflags = IRQF_TRIGGER_LOW;
 
 		if (dev_fwnode(&client->dev))
 			irqflags = 0;
-
-		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
-		regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
-				   PIN_IO_INTA_OUT, PIN_IO_INTAPM);
 		ret = devm_request_threaded_irq(&client->dev, client->irq,
 						NULL, pcf85363_rtc_handle_irq,
 						irqflags | IRQF_ONESHOT,
 						"pcf85363", client);
-		if (ret)
-			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
-		else
-			set_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
+		if (ret) {
+			dev_warn(&client->dev,
+				 "unable to request IRQ, alarms disabled\n");
+			client->irq = 0;
+		}
+	}
+
+	if (client->irq > 0 || wakeup_source) {
+		device_init_wakeup(&client->dev, true);
+		set_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
+	} else {
+		clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
 	}
 
 	ret = devm_rtc_register_device(pcf85363->rtc);