linux-kernel - [PATCH v2] regulator: ltc3589: Make IRQ optional

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Date:	Wed, 10 Feb 2016 21:37:30 +0100
From:	Bernhard Walle <bernhard@...lle.de>
To:	lgirdwood@...il.com, broonie@...nel.org
Cc:	linux-kernel@...r.kernel.org, p.zabel@...gutronix.de,
	Bernhard Walle <bernhard@...lle.de>
Subject: [PATCH v2] 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@...lle.de>
---
Changes between v1 and v2:
 - Use 'client->irq' instead of 'client->irq != 0'
 - Wrap long line
 - Don't print the IRQ number since that was leftover from my debugging

 drivers/regulator/ltc3589.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/regulator/ltc3589.c b/drivers/regulator/ltc3589.c
index 972c386..47bef32 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;
-- 
2.7.1