rtc: ds1307: add Intersil ISL12057 support

Intersil ISL12057 is a drop-in replacement for DS1337. It can be supported
by the ds1307 driver.

Acked-by: Arnaud Ebalard <arno@natisbad.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

2 files changed, 10 insertions, 4 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 6ce3dad73253..83a788416721 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -208,14 +208,14 @@ config RTC_DRV_AS3722
           will be called rtc-as3722.
 
 config RTC_DRV_DS1307
-        tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
+        tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025, ISL12057"
         help
           If you say yes here you get support for various compatible RTC
           chips (often with battery backup) connected with I2C. This driver
           should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
-          EPSON RX-8025 and probably other chips. In some cases the RTC
-          must already have been initialized (by manufacturing or a
-          bootloader).
+          EPSON RX-8025, Intersil ISL12057 and probably other chips. In some
+          cases the RTC must already have been initialized (by manufacturing or
+          a bootloader).
 
           The first seven registers on these chips hold an RTC, and other
           registers may add features such as NVRAM, a trickle charger for
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 712e221d2415..4e31036ee259 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -186,6 +186,7 @@ static const struct i2c_device_id ds1307_id[] = {
         { "mcp7941x", mcp794xx },
         { "pt7c4338", ds_1307 },
         { "rx8025", rx_8025 },
+        { "isl12057", ds_1337 },
         { }
 };
 MODULE_DEVICE_TABLE(i2c, ds1307_id);
@@ -1333,6 +1334,11 @@ static int ds1307_probe(struct i2c_client *client,
         if (of_property_read_bool(client->dev.of_node, "wakeup-source")) {
                 ds1307_can_wakeup_device = true;
         }
+        /* Intersil ISL12057 DT backward compatibility */
+        if (of_property_read_bool(client->dev.of_node,
+                                  "isil,irq2-can-wakeup-machine")) {
+                ds1307_can_wakeup_device = true;
+        }
 #endif
 
         switch (ds1307->type) {