See if this patch helps:
From a46ef98f3677c6e68768a2a4fd7752de4ddd779b Mon Sep 17 00:00:00 2001
From: Radu Bulie <radu-andrei.bulie@nxp.com>
Date: Fri, 11 Dec 2020 01:51:27 +0200
Subject: [PATCH] Add support for SIOCGMIIREG and SIOCSMIIREG
The support is added onto the mac device which actually defines a dummy netdevice needed to configure the phydev.
Signed-off-by: Radu Bulie <radu-andrei.bulie@nxp.com>
---
drivers/staging/fsl-dpaa2/mac/mac.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/staging/fsl-dpaa2/mac/mac.c b/drivers/staging/fsl-dpaa2/mac/mac.c
index 65cbdbe7f313..1435462e8cb0 100644
--- a/drivers/staging/fsl-dpaa2/mac/mac.c
+++ b/drivers/staging/fsl-dpaa2/mac/mac.c
@@ -393,11 +393,29 @@ static int dpaa2_mac_get_sset_count(struct net_device *dev, int sset)
}
}
+int dpaa2_mac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+ int ret = -EINVAL;
+
+
+ if (cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) {
+ if (!dev->phydev)
+ ret = -EINVAL;
+ else {
+ ret = phy_mii_ioctl(dev->phydev, rq, cmd);
+ }
+ } else
+ ret = -EOPNOTSUPP;
+
+ return ret;
+}
+
static const struct net_device_ops dpaa2_mac_ndo_ops = {
.ndo_open = &dpaa2_mac_open,
.ndo_stop = &dpaa2_mac_stop,
.ndo_start_xmit = &dpaa2_mac_drop_frame,
.ndo_get_stats64 = &dpaa2_mac_get_stats,
+ .ndo_do_ioctl = &dpaa2_mac_ioctl,
};
static const struct ethtool_ops dpaa2_mac_ethtool_ops = {
--
2.17.1
To use something with this patch - example phytool you need to:
CONFIG_FSL_DPAA2_MAC_NETDEVS=y
Once you booted and created an interface that is connected let's say to dpmac.2, when you do an ifconfig -a you will see a strange interface called mac2. (exactly like this). Use that netdevice to communicate with the phy. Example:
./phytool write mac3/4:0x1E/0xC47A 0x1803
