[PATCH linux] ARM: dts: aspeed: zaius: Enable NC-SI mux

[Xo Wang]

The Zaius motherboard has muxes for the RMII lines from the BMC to:
  - BCM5719 LAN on motherboard (LOM)
  - OCP mezzanine connector
  - HDMI form factor connector

Assert the active-low enable line for the muxes. Due to the AST2500
default internal pull-down resistors, the muxes selection lines will
be low. This implicitly selects the LOM for NC-SI.

The NC-SI interface will show up as network interface eth0.

Signed-off-by: Xo Wang <xow at google.com>
---
 arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts b/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts
index dc0546869886..3bd70ed810af 100644
--- a/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts
@@ -325,6 +325,13 @@
 		line-name = "iso_u164_en";
 	};
 
+	ncsi_mux_en_n {
+		gpio-hog;
+		gpios = <ASPEED_GPIO(P, 0) GPIO_ACTIVE_HIGH>;
+		output-low;
+		line-name = "ncsi_mux_en_n";
+	};
+
 	line_bmc_i2c2_sw_rst_n {
 		gpio-hog;
 		gpios = <ASPEED_GPIO(P, 1) GPIO_ACTIVE_HIGH>;
-- 
2.12.0.rc1.440.g5b76565f74-goog