[U-Boot] [PATCH V3 4/6] 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.
In Kconfig, user needs enable CONFIG_FEC_MXC_SHARE_MDIO first to enter
the CONFIG_FEC_MXC_MDIO_BASE.

To i.MX28, adapt to use the new config

Signed-off-by: Peng Fan <peng.fan at nxp.com>
Acked-by: Joe Hershberger <joe.hershberger at ni.com>
Cc: Fabio Estevam <fabio.estevam at nxp.com>
---

V3:
 Fix build error. Add a new FEC_MXC_SHARE_MDIO Kconfig for MDIO.

 drivers/net/Kconfig       | 13 ++++++++++++-
 drivers/net/fec_mxc.c     |  8 ++++++--
 include/configs/mx28evk.h |  1 +
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index de1947ccc1..c4cbe34798 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -147,9 +147,20 @@ config ETHOC
 	help
 	  This MAC is present in OpenRISC and Xtensa XTFPGA boards.
 
+config FEC_MXC_SHARE_MDIO
+	bool "Share the MDIO bus for FEC controller"
+	depends on FEC_MXC
+
+config FEC_MXC_MDIO_BASE
+	hex "MDIO base address for the FEC controller"
+	depends on FEC_MXC_SHARE_MDIO
+	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
+	depends on MX5 || MX6 || MX7
 	help
 	  This driver supports the 10/100 Fast Ethernet controller for
 	  NXP i.MX processors.
diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 4f1c906a72..ba66c2f95a 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1145,12 +1145,12 @@ int fecmxc_initialize_multi(bd_t *bd, int dev_id, int phy_id, uint32_t addr)
 #endif
 	int ret;
 
-#ifdef CONFIG_MX28
+#ifdef CONFIG_FEC_MXC_MDIO_BASE
 	/*
 	 * The i.MX28 has two ethernet interfaces, but they are not equal.
 	 * Only the first one can access the MDIO bus.
 	 */
-	base_mii = MXS_ENET0_BASE;
+	base_mii = CONFIG_FEC_MXC_MDIO_BASE;
 #else
 	base_mii = addr;
 #endif
@@ -1272,7 +1272,11 @@ 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;
diff --git a/include/configs/mx28evk.h b/include/configs/mx28evk.h
index bc58ca5c62..79d4c9b2ce 100644
--- a/include/configs/mx28evk.h
+++ b/include/configs/mx28evk.h
@@ -65,6 +65,7 @@
 /* FEC Ethernet on SoC */
 #ifdef	CONFIG_CMD_NET
 #define CONFIG_FEC_MXC
+#define CONFIG_FEC_MXC_MDIO_BASE MXS_ENET0_BASE
 #define CONFIG_MX28_FEC_MAC_IN_OCOTP
 #endif
 
-- 
2.14.1