regulator: ltc3589: Make IRQ optional

It's perfectly valid to use the LTC3589 without an interrupt pin
connected to it. Currently, the driver probing fails when client->irq
is 0 (which means "no interrupt"). Don't register the interrupt
handler in that case but successfully finish the device probing instead.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 9 insertions, 6 deletions

diff --git a/drivers/regulator/ltc3589.c b/drivers/regulator/ltc3589.c
index 972c386b2690..47bef328fb58 100644
--- a/drivers/regulator/ltc3589.c
+++ b/drivers/regulator/ltc3589.c
@@ -520,12 +520,15 @@ static int ltc3589_probe(struct i2c_client *client,
                 }
         }
 
-        ret = devm_request_threaded_irq(dev, client->irq, NULL, ltc3589_isr,
-                                        IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-                                        client->name, ltc3589);
-        if (ret) {
-                dev_err(dev, "Failed to request IRQ: %d\n", ret);
-                return ret;
+        if (client->irq) {
+                ret = devm_request_threaded_irq(dev, client->irq, NULL,
+                                                ltc3589_isr,
+                                                IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+                                                client->name, ltc3589);
+                if (ret) {
+                        dev_err(dev, "Failed to request IRQ: %d\n", ret);
+                        return ret;
+                }
         }
 
         return 0;