net: fec: prevent undesired de-assertion of phy-reset on request

When gpio_request_by_name allocates a gpio output it by default will
de-assert the gpio which for phy-reset will take the PHY out of reset.
As this occurs before fec_gpio_reset is called to assert the reset
line it can cause undesired affects if reset timings are not properly
met.

Configure the gpio with GPIOD_IS_OUT_ACTIVE so that reset is kept active
(reset asserted) to avoid this.

Cc: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Tested-by: Adam Ford <aford173@gmail.com> #imx8mm-beacon
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 3ac8e2a..a623a5c 100644 (file)
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1324,7 +1324,7 @@ static int fecmxc_of_to_plat(struct udevice *dev)
 
 #if CONFIG_IS_ENABLED(DM_GPIO)
        ret = gpio_request_by_name(dev, "phy-reset-gpios", 0,
-                                  &priv->phy_reset_gpio, GPIOD_IS_OUT);
+                                  &priv->phy_reset_gpio, GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
        if (ret < 0)
                return 0; /* property is optional, don't return error! */