Sean
On 12/11/19 7:12 AM, Sean Nyekjaer wrote:
It's a good idea to reset a ip-block/spi device before using it, this
patch will reset the device.
Added a generic reset function if needed elsewhere.
Signed-off-by: Sean Nyekjaer <sean@xxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
Changes v3:
- added reset if the reset_gpio is not avaliable
drivers/net/can/m_can/tcan4x5x.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
index b6b2feca9e8f..960a16aca7ca 100644
--- a/drivers/net/can/m_can/tcan4x5x.c
+++ b/drivers/net/can/m_can/tcan4x5x.c
@@ -166,6 +166,21 @@ static void tcan4x5x_check_wake(struct tcan4x5x_priv *priv)
}
}
+static void tcan4x5x_reset(struct tcan4x5x_priv *priv)
+{
+ if (priv->reset_gpio) {
+ gpiod_set_value(priv->reset_gpio, 1);
+
+ /* tpulse_width minimum 30us */
+ usleep_range(30, 100);
+ gpiod_set_value(priv->reset_gpio, 0);
+ } else {
+ regmap_write(priv->regmap, TCAN4X5X_CONFIG, TCAN4X5X_SW_RESET);
error handling especially for the I/O
Dan
