+/* Common OF config bits for KSZ9021 and KSZ9031 */
+#if defined(CONFIG_PHY_MICREL_KSZ9021) || defined(CONFIG_PHY_MICREL_KSZ9031)
+#ifdef CONFIG_DM_ETH
+struct ksz90x1_reg_field {
+ const char *name;
+ const u8 size; /* Size of the bitfield, in bits */
+ const u8 off; /* Offset from bit 0 */
+ const u8 dflt; /* Default value */
+};
+
+struct ksz90x1_ofcfg {
+ const u16 reg;
+ const u16 devad;
+ const struct ksz90x1_reg_field *grp;
+ const u16 grpsz;
+};
+
+static const struct ksz90x1_reg_field ksz90x1_rxd_grp[] = {
+ { "rxd0-skew-ps", 4, 0, 0x7 }, { "rxd1-skew-ps", 4, 4, 0x7 },
+ { "rxd2-skew-ps", 4, 8, 0x7 }, { "rxd3-skew-ps", 4, 12, 0x7 }
+};
+
+static const struct ksz90x1_reg_field ksz90x1_txd_grp[] = {
+ { "txd0-skew-ps", 4, 0, 0x7 }, { "txd1-skew-ps", 4, 4, 0x7 },
+ { "txd2-skew-ps", 4, 8, 0x7 }, { "txd3-skew-ps", 4, 12, 0x7 },
+};
+
+static int ksz90x1_of_config_group(struct phy_device *phydev,
+ struct ksz90x1_ofcfg *ofcfg)
+{
+ struct udevice *dev = phydev->dev;
+ struct phy_driver *drv = phydev->drv;
+ const int ps_to_regval = 60;
+ int val[4];
+ int i, changed = 0, offset, max;
+ u16 regval = 0;
+
+ if (!drv || !drv->writeext)
+ return -EOPNOTSUPP;
+
+ for (i = 0; i < ofcfg->grpsz; i++) {
+ val[i] = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
+ ofcfg->grp[i].name, -1);
+ offset = ofcfg->grp[i].off;
+ if (val[i] == -1) {
+ /* Default register value for KSZ9021 */
+ regval |= ofcfg->grp[i].dflt << offset;
+ } else {
+ changed = 1; /* Value was changed in OF */
+ /* Calculate the register value and fix corner cases */
+ if (val[i] > ps_to_regval * 0xf) {
+ max = (1 << ofcfg->grp[i].size) - 1;
+ regval |= max << offset;
+ } else {
+ regval |= (val[i] / ps_to_regval) << offset;
+ }
+ }
+ }
+
+ if (!changed)
+ return 0;
+
+ return drv->writeext(phydev, 0, ofcfg->devad, ofcfg->reg, regval);
+}
+#endif
+#endif
+