ARM: dts: stm32: Do not set eth1addr if KS8851 has EEPROM

In case the KS8851 has external EEPROM attached to it, do not set
eth1addr at all. The network stack will read the MAC out of the
KS8851 and set eth1addr accordingly.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>

diff --git a/board/dhelectronics/dh_stm32mp1/board.c b/board/dhelectronics/dh_stm32mp1/board.c
index c9abe3cc6df193816f7f2e2cb4e69caf7b15cc80..f42d395098bcc5c03bcfb6aec2afe51c1050b70c 100644 (file)
--- a/board/dhelectronics/dh_stm32mp1/board.c
+++ b/board/dhelectronics/dh_stm32mp1/board.c
@@ -81,6 +81,11 @@
  */
 DECLARE_GLOBAL_DATA_PTR;
 
+#define KS_CCR         0x08
+#define KS_CCR_EEPROM  BIT(9)
+#define KS_BE0         BIT(12)
+#define KS_BE1         BIT(13)
+
 int setup_mac_address(void)
 {
        unsigned char enetaddr[6];
@@ -97,12 +102,39 @@ int setup_mac_address(void)
        if (off < 0) {
                /* ethernet1 is not present in the system */
                skip_eth1 = true;
-       } else {
-               ret = eth_env_get_enetaddr("eth1addr", enetaddr);
-               if (ret)        /* eth1addr is already set */
-                       skip_eth1 = true;
+               goto out_set_ethaddr;
+       }
+
+       ret = eth_env_get_enetaddr("eth1addr", enetaddr);
+       if (ret) {
+               /* eth1addr is already set */
+               skip_eth1 = true;
+               goto out_set_ethaddr;
+       }
+
+       ret = fdt_node_check_compatible(gd->fdt_blob, off, "micrel,ks8851-mll");
+       if (ret)
+               goto out_set_ethaddr;
+
+       /*
+        * KS8851 with EEPROM may use custom MAC from EEPROM, read
+        * out the KS8851 CCR register to determine whether EEPROM
+        * is present. If EEPROM is present, it must contain valid
+        * MAC address.
+        */
+       u32 reg, ccr;
+       reg = fdt_get_base_address(gd->fdt_blob, off);
+       if (!reg)
+               goto out_set_ethaddr;
+
+       writew(KS_BE0 | KS_BE1 | KS_CCR, reg + 2);
+       ccr = readw(reg);
+       if (ccr & KS_CCR_EEPROM) {
+               skip_eth1 = true;
+               goto out_set_ethaddr;
        }
 
+out_set_ethaddr:
        if (skip_eth0 && skip_eth1)
                return 0;