regulator: pca9450: Make IRQ optional

The IRQ line might not be connected on some boards. Allow the driver
to be probed without it.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://patch.msgid.link/20240708084107.38986-5-frieder@fris.de
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: fschrempf

drivers/regulator/pca9450-regulator.c

@@ -891,11 +891,6 @@ static int pca9450_i2c_probe(struct i2c_client *i2c)
 	unsigned int reset_ctrl;
 	int ret;
 
-	if (!i2c->irq) {
-		dev_err(&i2c->dev, "No IRQ configured?\n");
-		return -EINVAL;
-	}
-
 	pca9450 = devm_kzalloc(&i2c->dev, sizeof(struct pca9450), GFP_KERNEL);
 	if (!pca9450)
 		return -ENOMEM;
@@ -967,23 +962,25 @@ static int pca9450_i2c_probe(struct i2c_client *i2c)
 		}
 	}
 
-	ret = devm_request_threaded_irq(pca9450->dev, pca9450->irq, NULL,
-					pca9450_irq_handler,
-					(IRQF_TRIGGER_FALLING | IRQF_ONESHOT),
-					"pca9450-irq", pca9450);
-	if (ret != 0) {
-		dev_err(pca9450->dev, "Failed to request IRQ: %d\n",
-			pca9450->irq);
-		return ret;
-	}
-	/* Unmask all interrupt except PWRON/WDOG/RSVD */
-	ret = regmap_update_bits(pca9450->regmap, PCA9450_REG_INT1_MSK,
-				IRQ_VR_FLT1 | IRQ_VR_FLT2 | IRQ_LOWVSYS |
-				IRQ_THERM_105 | IRQ_THERM_125,
-				IRQ_PWRON | IRQ_WDOGB | IRQ_RSVD);
-	if (ret) {
-		dev_err(&i2c->dev, "Unmask irq error\n");
-		return ret;
+	if (pca9450->irq) {
+		ret = devm_request_threaded_irq(pca9450->dev, pca9450->irq, NULL,
+						pca9450_irq_handler,
+						(IRQF_TRIGGER_FALLING | IRQF_ONESHOT),
+						"pca9450-irq", pca9450);
+		if (ret != 0) {
+			dev_err(pca9450->dev, "Failed to request IRQ: %d\n",
+				pca9450->irq);
+			return ret;
+		}
+		/* Unmask all interrupt except PWRON/WDOG/RSVD */
+		ret = regmap_update_bits(pca9450->regmap, PCA9450_REG_INT1_MSK,
+					IRQ_VR_FLT1 | IRQ_VR_FLT2 | IRQ_LOWVSYS |
+					IRQ_THERM_105 | IRQ_THERM_125,
+					IRQ_PWRON | IRQ_WDOGB | IRQ_RSVD);
+		if (ret) {
+			dev_err(&i2c->dev, "Unmask irq error\n");
+			return ret;
+		}
 	}
 
 	/* Clear PRESET_EN bit in BUCK123_DVS to use DVS registers */