LM
/
u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Tim Harvey 2022-03-01 12:15:01 -08:00 committed by Ramon Fried
parent e24b58f5ed
commit 4223fb0ee1
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/fec_mxc.c
View File

@ -1324,7 +1324,7 @@ static int fecmxc_of_to_plat(struct udevice *dev)
#if CONFIG_IS_ENABLED(DM_GPIO) #if CONFIG_IS_ENABLED(DM_GPIO)
ret = gpio_request_by_name(dev, "phy-reset-gpios", 0, 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) if (ret < 0)
return 0; /* property is optional, don't return error! */ return 0; /* property is optional, don't return error! */