[U-Boot] [PATCH 4/5] net: fec: sharing MDIO for two enet controllers

[Peng Fan]

On i.MX6SX, 6UL and 7D, there are two enet controllers each has a
MDIO port. But Some boards share one MDIO port for the two enets. So
introduce a configuration CONFIG_FEC_MXC_MDIO_BASE to indicate
the MDIO port for sharing.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/net/Kconfig   | 7 +++++++
 drivers/net/fec_mxc.c | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index de1947ccc1..3a468a7c59 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -147,6 +147,13 @@ config ETHOC
 	help
 	  This MAC is present in OpenRISC and Xtensa XTFPGA boards.
 
+config FEC_MXC_MDIO_BASE
+	hex "MDIO base address for the FEC controller"
+	depends on FEC_MXC
+	help
+	  This specifies the MDIO registers base address. It is used when
+	  two FEC controllers share MDIO bus.
+
 config FEC_MXC
 	bool "FEC Ethernet controller"
 	depends on MX5 || MX6
diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 2c3171ecc9..e8f8fef66a 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1161,8 +1161,12 @@ int fecmxc_initialize_multi(bd_t *bd, int dev_id, int phy_id, uint32_t addr)
 	 * Only the first one can access the MDIO bus.
 	 */
 	base_mii = MXS_ENET0_BASE;
+#else
+#ifdef CONFIG_FEC_MXC_MDIO_BASE
+	base_mii = CONFIG_FEC_MXC_MDIO_BASE;
 #else
 	base_mii = addr;
+#endif
 #endif
 	debug("eth_init: fec_probe(bd, %i, %i) @ %08x\n", dev_id, phy_id, addr);
 	bus = fec_get_miibus(base_mii, dev_id);
@@ -1274,7 +1278,12 @@ static int fecmxc_probe(struct udevice *dev)
 	fec_reg_setup(priv);
 
 	priv->dev_id = dev->seq;
+
+#ifdef CONFIG_FEC_MXC_MDIO_BASE
+	bus = fec_get_miibus((ulong)CONFIG_FEC_MXC_MDIO_BASE, dev->seq);
+#else
 	bus = fec_get_miibus((ulong)priv->eth, dev->seq);
+#endif
 	if (!bus) {
 		ret = -ENOMEM;
 		goto err_mii;
-- 
2.14.1