git show 65aa7b3710ba5a52da84a3b4b1d4519e66a0596c
commit 65aa7b3710ba5a52da84a3b4b1d4519e66a0596c (HEAD -> br-usb)
Author: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
Date:   Wed Mar 28 15:41:07 2018 +0300

    boards: frdm: Fine tune options to choose proper driver

    In case of frdm_64f board, if user chose Ethernet networking
    ETH_MCUX will be enabled. If user chose Ethernet based on USB
    networking ETH_MCUX will be disabled.

    Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>

diff --git a/arch/arm/soc/nxp_kinetis/k6x/Kconfig.defconfig.mk64f12 b/arch/arm/soc/nxp_kinetis/k6x/Kconfig.defconfig.mk64f12
index 12ac55238..853dc2409 100644
--- a/arch/arm/soc/nxp_kinetis/k6x/Kconfig.defconfig.mk64f12
+++ b/arch/arm/soc/nxp_kinetis/k6x/Kconfig.defconfig.mk64f12
@@ -67,13 +67,6 @@ config SPI_MCUX_DSPI

 endif # SPI

-if NET_L2_ETHERNET
-
-config ETH_MCUX
-       def_bool y
-
-endif # NET_L2_ETHERNET
-
 if ENTROPY_GENERATOR

 config ENTROPY_MCUX_RNGA
@@ -102,4 +95,18 @@ config USB_KINETIS

 endif # USB

+if NET_L2_ETHERNET
+
+if USB_DEVICE_NETWORK_ECM
+config ETH_MCUX
+       def_bool n
+endif # USB_DEVICE_NETWORK_ECM
+
+if !USB_DEVICE_NETWORK_ECM
+config ETH_MCUX
+       def_bool y
+endif # !USB_DEVICE_NETWORK_ECM
+
+endif # NET_L2_ETHERNET
+
 endif # SOC_MK64F12
diff --git a/boards/arm/frdm_k64f/Kconfig.defconfig b/boards/arm/frdm_k64f/Kconfig.defconfig
index 124dfa221..068a8e109 100644
--- a/boards/arm/frdm_k64f/Kconfig.defconfig
+++ b/boards/arm/frdm_k64f/Kconfig.defconfig
@@ -131,8 +131,17 @@ if NETWORKING
 config NET_L2_ETHERNET
        def_bool y

+if NET_L2_ETHERNET
+if USB_DEVICE_NETWORK_ECM
 config ETH_MCUX_0
-       def_bool y if NET_L2_ETHERNET
+        def_bool n
+endif # USB_DEVICE_NETWORK_ECM
+
+if !USB_DEVICE_NETWORK_ECM
+config ETH_MCUX_0
+        def_bool y
+endif # !USB_DEVICE_NETWORK_ECM
+endif # NET_L2_ETHERNET

 endif # NETWORKING

(END)