From: David Lowe <dave-lowe@ntlworld.com>
Date: Sat, 22 Apr 2017 17:28:00 +0000 (+0100)
Subject: rtc: rtc-ds1307: enable support for mcp794xx as a wakeup source without IRQ
X-Git-Tag: v4.13-rc1~40^2~49
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=8066360744743fb7f2dee1e2041fc9fc92f9d6b5;p=linux.git

rtc: rtc-ds1307: enable support for mcp794xx as a wakeup source without IRQ

This patch extends the fixes for ds1337, ds1339, ds3231 in commit
8bc2a40730ec ("rtc: ds1307: add support for the DT property
'wakeup-source'") to mcp794xx devices, so that those parts can similarly be
used as a wakeup source without an IRQ to the processor.

Tested on Raspberry Pi ZeroW with MCP79400.

Signed-off-by: David Lowe <dave-lowe@ntlworld.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 94e13d703735..a264938500af 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -1407,7 +1407,8 @@ static int ds1307_probe(struct i2c_client *client,
 		break;
 	case mcp794xx:
 		rtc_ops = &mcp794xx_rtc_ops;
-		if (ds1307->irq > 0 && chip->alarm) {
+		if (chip->alarm && (ds1307->irq > 0 ||
+				    ds1307_can_wakeup_device)) {
 			irq_handler = mcp794xx_irq;
 			want_irq = true;
 		}