Commit 04515932 authored Jul 01, 2024 by Marek Behún Committed by Arnd Bergmann Jul 01, 2024

ARM: dts: turris-omnia: Add MCU system-controller node



Turris Omnia's MCU provides various features that can be configured over
I2C at address 0x2a. Add device-tree node.

This does not carry a Fixes tag - we do not want this to get backported
to stable kernels for the following reason: U-Boot since v2022.10
inserts a phy-reset-gpio property into the WAN ethernet node pointing to
the MCU node if it finds the MCU node with a cznic,turris-omnia-mcu
compatible. Thus if this change got backported to a stable kernel, the
WAN interface driver would defer probe indefinitely (since it would wait
for the turris-omnia-mcu driver which would not be present).

Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20240701113010.16447-8-kabel@kernel.org


Signed-off-by: Arnd Bergmann <arnd@arndb.de>

parent 8181a2f1

arch/arm/boot/dts/marvell/armada-385-turris-omnia.dts

+21 −1

Original line number	Diff line number	Diff line
		@@ -218,7 +218,22 @@ i2c@0 {
		#size-cells = <0>;
		reg = <0>;

		/* STM32F0 command interface at address 0x2a */
		mcu: system-controller@2a {
		compatible = "cznic,turris-omnia-mcu";
		reg = <0x2a>;

		pinctrl-names = "default";
		pinctrl-0 = <&mcu_pins>;

		interrupt-parent = <&gpio1>;
		interrupts = <11 IRQ_TYPE_NONE>;

		gpio-controller;
		#gpio-cells = <3>;

		interrupt-controller;
		#interrupt-cells = <2>;
		};

		led-controller@2b {
		compatible = "cznic,turris-omnia-leds";
		@@ -501,6 +516,11 @@ fixed-link {
		};

		&pinctrl {
		mcu_pins: mcu-pins {
		marvell,pins = "mpp43";
		marvell,function = "gpio";
		};

		pcawan_pins: pcawan-pins {
		marvell,pins = "mpp46";
		marvell,function = "gpio";