From: Sean Nyekjaer <sean@geanix.com>
Date: Fri, 6 Dec 2019 15:29:22 +0000 (+0100)
Subject: can: m_can: tcan4x5x: add required delay after reset
X-Git-Tag: v5.15~4840^2~76^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=60552253e29c8860ee5bf1e6064591b0917c0394;p=platform%2Fkernel%2Flinux-starfive.git

can: m_can: tcan4x5x: add required delay after reset

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@geanix.com>
Acked-by: Dan Murphy <dmurphy@ti.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v5.4
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---

diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
index 3db6192..d5d4bfa 100644
--- 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 m_can_classdev *cdev)
 	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);