[rtc-linux] [Patch] rtc: rtc-ds1307: enable support for mcp794xx as a wakeup source without IRQ

[David Lowe <dave-lowe@ntlworld.com>]

This patch extends the fixes for ds1337, ds1339, ds3231 in 8bc2a40730ec
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>
---
--- a/drivers/rtc/rtc-ds1307.c	2017-03-28 16:16:38.158076224 +0100
+++ b/drivers/rtc/rtc-ds1307.c	2017-03-28 16:16:52.248431799 +0100
@@ -1487,7 +1487,8 @@ static int ds1307_probe(struct i2c_clien
 		break;
 	case mcp794xx:
 		rtc_ops = &mcp794xx_rtc_ops;
-		if (ds1307->client->irq > 0 && chip->alarm) {
+		if (chip->alarm && (ds1307->client->irq > 0 ||
+						ds1307_can_wakeup_device)) {
 			irq_handler = mcp794xx_irq;
 			want_irq = true;
 		}

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