linux-kernel - [PATCH 5.4 373/434] can: m_can: tcan4x5x: add required delay after reset

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Date:   Sun, 29 Dec 2019 18:27:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Nyekjaer <sean@...nix.com>,
        Dan Murphy <dmurphy@...com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.4 373/434] can: m_can: tcan4x5x: add required delay after reset

From: Sean Nyekjaer <sean@...nix.com>

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@...nix.com>
Acked-by: Dan Murphy <dmurphy@...com>
Cc: linux-stable <stable@...r.kernel.org> # >= v5.4
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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);