From: Sean Nyekjaer <sean@xxxxxxxxxx> commit 60552253e29c8860ee5bf1e6064591b0917c0394 upstream. According to section "8.3.8 RST Pin" in the datasheet we are required to wait >700us after the device is reset. Signed-off-by: Sean Nyekjaer <sean@xxxxxxxxxx> Acked-by: Dan Murphy <dmurphy@xxxxxx> Cc: linux-stable <stable@xxxxxxxxxxxxxxx> # >= v5.4 Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/can/m_can/tcan4x5x.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/net/can/m_can/tcan4x5x.c +++ b/drivers/net/can/m_can/tcan4x5x.c @@ -354,6 +354,8 @@ static int tcan4x5x_parse_config(struct if (IS_ERR(tcan4x5x->reset_gpio)) tcan4x5x->reset_gpio = NULL; + usleep_range(700, 1000); + tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev, "device-state", GPIOD_IN);
