[PATCH v2] can: tcan4x5x: put tcan into sleep when removing driver

Put the tcan4x5x transceiver into sleep mode when the driver is
removed, instead of leaving it in its current operating mode.
This reduces power consumption(3mA@12V) once the driver is
no longer bound to the device.

Signed-off-by: Sean Nyekjaer <[email protected]>
---
Changes since v1:
 - Moved enter sleep mode into tcan4x5x_power_enable()

 drivers/net/can/m_can/tcan4x5x-core.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 31cc9d0abd45..67902b8b0fab 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -211,15 +211,21 @@ static int tcan4x5x_write_fifo(struct m_can_classdev *cdev,
 	return regmap_bulk_write(priv->regmap, TCAN4X5X_MRAM_START + addr_offset, val, val_count);
 }
 
-static int tcan4x5x_power_enable(struct regulator *reg, int enable)
+static int tcan4x5x_power_enable(struct tcan4x5x_priv *priv, int enable)
 {
-	if (IS_ERR_OR_NULL(reg))
+	if (IS_ERR_OR_NULL(priv->power)) {
+		if (priv->reset_gpio && !enable)
+			return regmap_update_bits(priv->regmap, TCAN4X5X_CONFIG,
+						  TCAN4X5X_MODE_SEL_MASK,
+						  TCAN4X5X_MODE_SLEEP);
+
 		return 0;
+	}
 
 	if (enable)
-		return regulator_enable(reg);
+		return regulator_enable(priv->power);
 	else
-		return regulator_disable(reg);
+		return regulator_disable(priv->power);
 }
 
 static int tcan4x5x_write_tcan_reg(struct m_can_classdev *cdev,
@@ -476,7 +482,7 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 		goto out_m_can_class_free_dev;
 	}
 
-	ret = tcan4x5x_power_enable(priv->power, 1);
+	ret = tcan4x5x_power_enable(priv, 1);
 	if (ret) {
 		dev_err(&spi->dev, "Enabling regulator failed %pe\n",
 			ERR_PTR(ret));
@@ -531,7 +537,7 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	return 0;
 
 out_power:
-	tcan4x5x_power_enable(priv->power, 0);
+	tcan4x5x_power_enable(priv, 0);
  out_m_can_class_free_dev:
 	m_can_class_free_dev(mcan_class->net);
 	return ret;
-- 
2.55.0