Add support to use a regulator for the core. This is optional and used
to register the dependency on the regulator.

Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/net/can/m_can/m_can.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index c539375005f71c88fd1f7d1a885ce890ce0e9327..274fdcae49c31d4792b81cdc065821206d3cb206 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -23,6 +23,7 @@
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 #include "m_can.h"
 
@@ -2421,6 +2422,11 @@ struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
 	if (dev->of_node && of_property_read_bool(dev->of_node, "wakeup-source"))
 		device_set_wakeup_capable(dev, true);
 
+	ret = devm_regulator_get_enable_optional(dev, "vio");
+	if (ret)
+		return ERR_PTR(
+			dev_err_probe(dev, ret, "Failed to get or enable optional regulator\n"));
+
 	/* Get TX FIFO size
 	 * Defines the total amount of echo buffers for loopback
 	 */

-- 
2.45.2