rtc: hym8563: make the irq optional

Sometimes the irq line is not connected to any soc-pin. This does
not hinder basic timekeeping functionality of the rtc, so probe
should not fail in this case.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

2 files changed, 11 insertions, 9 deletions

diff --git a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
index 5c199ee044cb..a8934fe2ab4c 100644
--- a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
+++ b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
@@ -6,11 +6,11 @@ as well as a clock output of up to 32kHz.
 Required properties:
 - compatible: should be: "haoyu,hym8563"
 - reg: i2c address
-- interrupts: rtc alarm/event interrupt
 - #clock-cells: the value should be 0
 
 Optional properties:
 - clock-output-names: From common clock binding
+- interrupts: rtc alarm/event interrupt
 
 Example:
 
diff --git a/drivers/rtc/rtc-hym8563.c b/drivers/rtc/rtc-hym8563.c
index 0f710e98538f..e9da7959d3fe 100644
--- a/drivers/rtc/rtc-hym8563.c
+++ b/drivers/rtc/rtc-hym8563.c
@@ -548,14 +548,16 @@ static int hym8563_probe(struct i2c_client *client,
                 return ret;
         }
 
-        ret = devm_request_threaded_irq(&client->dev, client->irq,
-                                        NULL, hym8563_irq,
-                                        IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-                                        client->name, hym8563);
-        if (ret < 0) {
-                dev_err(&client->dev, "irq %d request failed, %d\n",
-                        client->irq, ret);
-                return ret;
+        if (client->irq > 0) {
+                ret = devm_request_threaded_irq(&client->dev, client->irq,
+                                                NULL, hym8563_irq,
+                                                IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+                                                client->name, hym8563);
+                if (ret < 0) {
+                        dev_err(&client->dev, "irq %d request failed, %d\n",
+                                client->irq, ret);
+                        return ret;
+                }
         }
 
         /* check state of calendar information */