[PATCH v3 5/5] rtc: s35390a: Add synology quirk

[Markus Probst <markus.probst@posteo.de>]

Synology NAS devices use interrupt signal 1 for wakeup alarms. On ACPI
it is not possible to configure pinctrl.

Use interrupt signal 1 for wakeup if no pinmux function has been
configured in devicetree and dmi sys vendor matches "Synology Inc.".

Signed-off-by: Markus Probst <markus.probst@posteo.de>
---
 drivers/rtc/rtc-s35390a.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
index d63bdeff8cdb..2537bd8fe3e8 100644
--- a/drivers/rtc/rtc-s35390a.c
+++ b/drivers/rtc/rtc-s35390a.c
@@ -5,6 +5,7 @@
  * Copyright (c) 2007 Byron Bradley
  */
 
+#include <linux/dmi.h>
 #include <linux/module.h>
 #include <linux/rtc.h>
 #include <linux/i2c.h>
@@ -771,8 +772,18 @@ static int s35390a_probe(struct i2c_client *client)
 		return dev_err_probe(dev, err, "pinctrl enable failed\n");
 
 	/* If no pinmux function is defined in DT, fallback to previous behaviour */
-	fallback[0] = S35390A_FUNC_IGNORE;
-	fallback[1] = S35390A_FUNC_WAKEUP;
+
+	if (dmi_match(DMI_SYS_VENDOR, "Synology Inc.")) {
+		/*
+		 * Synology uses interrupt signal 1 for wakeup. Since pinctrl cannot be
+		 * configured on ACPI, we check against the dmi sys vendor.
+		 */
+		fallback[0] = S35390A_FUNC_WAKEUP;
+		fallback[1] = S35390A_FUNC_DISABLE;
+	} else {
+		fallback[0] = S35390A_FUNC_IGNORE;
+		fallback[1] = S35390A_FUNC_WAKEUP;
+	}
 
 	for (i = 0; i < ARRAY_SIZE(s35390a_pin_groups); i++) {
 		if (s35390a->pinfunction[i] == -1) {

-- 
2.54.0