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net: stmmac: rk: rk3506, rk3528 and kk3588 have rmii_mode in clock register

This patch adds an rmii_mode_mask field to struct rk_clock_fields to handle
RMII mode configuration in the clock GRF register. It removes the SoC-specific
set_to_rmii() functions for rk3506, rk3528, and rk3588, replacing them with a
generic mechanism in rk_gmac_powerup().

[ ... ]

Is this comparison using the correct value? Earlier in rk_gmac_powerup(), the
variable ret is assigned the return value from rk_get_phy_intf_sel(), which is
PHY_INTF_SEL_RGMII (0) or PHY_INTF_SEL_RMII (1).

However, for SoCs that have gmac_phy_intf_sel_mask set (such as rk3588), the
code enters the preceding if block:

    if (bsp_priv->gmac_phy_intf_sel_mask || bsp_priv->gmac_rmii_mode_mask) {
        ...
        ret = regmap_write(bsp_priv->grf, bsp_priv->gmac_grf_reg, val);
        ...
    }

After this block, ret has been overwritten with the regmap_write() return
value (0 on success). When the rmii_mode_mask block executes, the comparison
ret == PHY_INTF_SEL_RMII becomes 0 == 1, which is always false.

This means for rk3588 in RMII mode, the rmii_mode bit in the clock register
will be cleared (RGMII mode) instead of set. Would it be better to save the
PHY interface selection value in a separate variable before it gets
overwritten?

+
+		ret = rk_write_clock_grf_reg(bsp_priv, val);
+		if (ret < 0)
+			return ret;
+	}