linux-kernel - [PATCH 2/2] can: mcp251x: get regulators optionally

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Message-Id: <1431966808-26213-2-git-send-email-stefan@agner.ch>
Date:	Mon, 18 May 2015 18:33:28 +0200
From:	Stefan Agner <stefan@...er.ch>
To:	wg@...ndegger.com, mkl@...gutronix.de
Cc:	chripell@...e.org, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	stefan@...er.ch
Subject: [PATCH 2/2] can: mcp251x: get regulators optionally

The regulators power and transceiver are optional. If those are not
present, the pointer (or error pointer) is correctly handled by the
driver, hence we can use devm_regulator_get_optional safely, which
avoids regulators getting created.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 drivers/net/can/spi/mcp251x.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index 34c625e..117e78f 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -1085,8 +1085,8 @@ static int mcp251x_can_probe(struct spi_device *spi)
 	if (ret)
 		goto out_clk;
 
-	priv->power = devm_regulator_get(&spi->dev, "vdd");
-	priv->transceiver = devm_regulator_get(&spi->dev, "xceiver");
+	priv->power = devm_regulator_get_optional(&spi->dev, "vdd");
+	priv->transceiver = devm_regulator_get_optional(&spi->dev, "xceiver");
 	if ((PTR_ERR(priv->power) == -EPROBE_DEFER) ||
 	    (PTR_ERR(priv->transceiver) == -EPROBE_DEFER)) {
 		ret = -EPROBE_DEFER;
-- 
2.4.1

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