At i2c address 0x2a is MCU command interface which provides access to GPIOs
connected to Turris Omnia MCU. So define mcu node in Turris Omnia DTS file.

Signed-off-by: Pali Rohár <pali@kernel.org>

---
Same change was already sent to U-Boot project together with driver. As
Turris Omnia DTS file is shared between Linux kernel U-Boot, I'm sending
this change also in Linux. There is a plan to write also Linux driver for
Turris Omnia MCU, like there is already in U-Boot.

https://source.denx.de/u-boot/u-boot/-/commit/832738974806e6264a3d0ac2aaa92d0f662fd128
https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/gpio/turris_omnia_mcu.c
---
 arch/arm/boot/dts/armada-385-turris-omnia.dts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/armada-385-turris-omnia.dts b/arch/arm/boot/dts/armada-385-turris-omnia.dts
index f4878df39753..f655e9229d68 100644
--- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
+++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts

@@ -184,7 +184,13 @@
 			#size-cells = <0>;
 			reg = <0>;
 
-			/* STM32F0 command interface at address 0x2a */
+			/* MCU command i2c API */
+			mcu: mcu@2a {
+				compatible = "cznic,turris-omnia-mcu";
+				reg = <0x2a>;
+				gpio-controller;
+				#gpio-cells = <3>;
+			};
 
 			led-controller@2b {
 				compatible = "cznic,turris-omnia-leds";

-- 
2.20.1