From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Tue, 22 Sep 2020 16:44:16 +0200
Subject: can: flexcan: flexcan_probe(): make regulator xceiver optional

Git-commit: 3d60f33a7a7afa7ba02b96ecc835c3450bf234b1
Patch-mainline: v5.10-rc1
References: jsc#SLE-12251

As the transcevier regulator is optional, this patch switches from
devm_regulator_get() to devm_regulator_get_optional(). This gets rid of "using
dummy regulator" warning message from the regulator core, if no regulator is
available.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20200922144429.2613631-8-mkl@pengutronix.de
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
---
 drivers/net/can/flexcan.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 06cddc468739..52b53ff223f4 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1579,11 +1579,13 @@ static int flexcan_probe(struct platform_device *pdev)
 	u8 clk_src = 1;
 	u32 clock_freq = 0;
 
-	reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver");
+	reg_xceiver = devm_regulator_get_optional(&pdev->dev, "xceiver");
 	if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
-	else if (IS_ERR(reg_xceiver))
+	else if (PTR_ERR(reg_xceiver) == -ENODEV)
 		reg_xceiver = NULL;
+	else if (IS_ERR(reg_xceiver))
+		return PTR_ERR(reg_xceiver);
 
 	if (pdev->dev.of_node) {
 		of_property_read_u32(pdev->dev.of_node,
-- 
2.26.2