[PATCH v2 5/5] rtc: s35390a: Add synology quirk

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 pinctrl state has been
configured in devicetree and dmi sys vendor matches "Synology Inc.".

Signed-off-by: Markus Probst <[email protected]>
---
 drivers/rtc/rtc-s35390a.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
index fc0dbce0e8f4..f20b8a5a72de 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>
@@ -806,7 +807,16 @@ static int s35390a_probe(struct i2c_client *client)
 
 	/* If no pinctrl config is defined in DT, fallback to previous behaviour */
 	if (!s35390a->mode_init) {
-		err = s35390a_update_mode(s35390a, 1, S35390A_MODE_WAKEUP, 0);
+		i = 1;
+		/*
+		 * Synology uses interrupt signal 1 for wakeup. Since pinctrl cannot be
+		 * configured on ACPI, we check against the dmi sys vendor.
+		 */
+		if (dmi_match(DMI_SYS_VENDOR, "Synology Inc.")) {
+			i = 0;
+			s35390a_update_mode(s35390a, 1, S35390A_MODE_DISABLE, 0);
+		}
+		err = s35390a_update_mode(s35390a, i, S35390A_MODE_WAKEUP, 0);
 		if (err)
 			return err;
 	}

-- 
2.54.0