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can: tcan45x: Make wake-up GPIO an optional GPIO

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The device has the ability to disable the wake-up pin option. The
wake-up pin can be either force to GND or Vsup and does not have to be
tied to a GPIO. In order for the device to not use the wake-up feature
write the register to disable the WAKE_CONFIG option.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Cc: Sean Nyekjaer <sean@geanix.com>
Reviewed-by: Sean Nyekjaer <sean@geanix.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Dan Murphy 2019-12-04 11:51:12 -06:00 committed by Marc Kleine-Budde
parent 1202d2318e
commit 2de4973569
1 changed files with 18 additions and 6 deletions
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24
drivers/net/can/m_can/tcan4x5x.c
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@ -101,6 +101,8 @@
#define TCAN4X5X_MODE_STANDBY BIT(6)
#define TCAN4X5X_MODE_NORMAL BIT(7)
#define TCAN4X5X_DISABLE_WAKE_MSK (BIT(31) | BIT(30))
#define TCAN4X5X_SW_RESET BIT(2)
#define TCAN4X5X_MCAN_CONFIGURED BIT(5)
@ -338,6 +340,14 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
return ret;
}
static int tcan4x5x_disable_wake(struct m_can_classdev *cdev)
{
struct tcan4x5x_priv *tcan4x5x = cdev->device_data;
return regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
TCAN4X5X_DISABLE_WAKE_MSK, 0x00);
}
static int tcan4x5x_parse_config(struct m_can_classdev *cdev)
{
struct tcan4x5x_priv *tcan4x5x = cdev->device_data;
@ -345,8 +355,10 @@ static int tcan4x5x_parse_config(struct m_can_classdev *cdev)
tcan4x5x->device_wake_gpio = devm_gpiod_get(cdev->dev, "device-wake",
GPIOD_OUT_HIGH);
if (IS_ERR(tcan4x5x->device_wake_gpio)) {
dev_err(cdev->dev, "device-wake gpio not defined\n");
return -EINVAL;
if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER)
return -EPROBE_DEFER;
tcan4x5x_disable_wake(cdev);
}
tcan4x5x->reset_gpio = devm_gpiod_get_optional(cdev->dev, "reset",
@ -430,10 +442,6 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
spi_set_drvdata(spi, priv);
ret = tcan4x5x_parse_config(mcan_class);
if (ret)
goto out_clk;
/* Configure the SPI bus */
spi->bits_per_word = 32;
ret = spi_setup(spi);
@ -443,6 +451,10 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus,
&spi->dev, &tcan4x5x_regmap);
ret = tcan4x5x_parse_config(mcan_class);
if (ret)
goto out_clk;
tcan4x5x_power_enable(priv->power, 1);
ret = m_can_class_register(mcan_class);