net: sun8i-emac: add support for new EMAC DT binding

The Ethernet MAC used in newer Allwinner SoCs (H3, A64, H5) got an
upstream Linux driver in v4.15.
This one uses a slightly different binding from the original one used
by the U-Boot driver.
The differences to the old binding are:
- The "syscon" address is held in a separate node, referenced via a
  phandle in the "syscon" property.
- The reference to the PHY is held in a property called "phy-handle",
  not "phy".
- The PHY register is at offset 0x30 in the syscon device, not at 0.
- The internal PHY is activated when the node, which phy-handle points
  to, is a child node of an "allwinner,sun8i-h3-mdio-internal" node.

Teach the U-Boot driver how to find its resources in a "new-style" DT,
so that we can use a Linux kernel compatible DT for U-Boot as well.
This keeps support for the old binding for now, to allow a smooth
transition.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index c8c8ef7..55d82f8 100644 (file)
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -279,7 +279,7 @@ static int sun8i_emac_set_syscon(struct emac_eth_dev *priv)
        int ret;
        u32 reg;
 
-       reg = readl(priv->sysctl_reg);
+       reg = readl(priv->sysctl_reg + 0x30);
 
        if (priv->variant == H3_EMAC) {
                ret = sun8i_emac_set_syscon_ephy(priv, &reg);
@@ -310,7 +310,7 @@ static int sun8i_emac_set_syscon(struct emac_eth_dev *priv)
                return -EINVAL;
        }
 
-       writel(reg, priv->sysctl_reg);
+       writel(reg, priv->sysctl_reg + 0x30);
 
        return 0;
 }
@@ -806,17 +806,52 @@ static int sun8i_emac_eth_ofdata_to_platdata(struct udevice *dev)
 #endif
 
        pdata->iobase = devfdt_get_addr_name(dev, "emac");
+       if (pdata->iobase == FDT_ADDR_T_NONE)
+               pdata->iobase = devfdt_get_addr(dev);
+       if (pdata->iobase == FDT_ADDR_T_NONE) {
+               debug("%s: Cannot find MAC base address\n", __func__);
+               return -EINVAL;
+       }
+
        priv->sysctl_reg = devfdt_get_addr_name(dev, "syscon");
+       if (priv->sysctl_reg == FDT_ADDR_T_NONE) {
+               const fdt32_t *reg;
+
+               offset = fdtdec_lookup_phandle(gd->fdt_blob, node, "syscon");
+               if (offset < 0) {
+                       debug("%s: cannot find syscon node\n", __func__);
+                       return -EINVAL;
+               }
+               reg = fdt_getprop(gd->fdt_blob, offset, "reg", NULL);
+               if (!reg) {
+                       debug("%s: cannot find reg property in syscon node\n",
+                             __func__);
+                       return -EINVAL;
+               }
+               priv->sysctl_reg = fdt_translate_address((void *)gd->fdt_blob,
+                                                        offset, reg);
+       } else {
+               priv->sysctl_reg -= 0x30;
+       }
+
+       if (priv->sysctl_reg == FDT_ADDR_T_NONE) {
+               debug("%s: Cannot find syscon base address\n", __func__);
+               return -EINVAL;
+       }
 
        pdata->phy_interface = -1;
        priv->phyaddr = -1;
        priv->use_internal_phy = false;
 
-       offset = fdtdec_lookup_phandle(gd->fdt_blob, node,
-                                      "phy");
-       if (offset > 0)
-               priv->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg",
-                                              -1);
+       offset = fdtdec_lookup_phandle(gd->fdt_blob, node, "phy");
+       if (offset < 0)
+               offset = fdtdec_lookup_phandle(gd->fdt_blob, node,
+                                              "phy-handle");
+       if (offset < 0) {
+               debug("%s: Cannot find PHY address\n", __func__);
+               return -EINVAL;
+       }
+       priv->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);
 
        phy_mode = fdt_getprop(gd->fdt_blob, node, "phy-mode", NULL);
 
@@ -839,8 +874,16 @@ static int sun8i_emac_eth_ofdata_to_platdata(struct udevice *dev)
 
        if (priv->variant == H3_EMAC) {
                if (fdt_getprop(gd->fdt_blob, node,
-                               "allwinner,use-internal-phy", NULL))
+                               "allwinner,use-internal-phy", NULL)) {
                        priv->use_internal_phy = true;
+               } else {
+                       int parent = fdt_parent_offset(gd->fdt_blob, offset);
+
+                       if (parent >= 0 &&
+                           !fdt_node_check_compatible(gd->fdt_blob, parent,
+                                       "allwinner,sun8i-h3-mdio-internal"))
+                               priv->use_internal_phy = true;
+               }
        }
 
        priv->interface = pdata->phy_interface;