not an expert in device-tree, anybody knows how enable uart2/uart4?

 

dts is attached.

 

expressobin v7

mainline

 

many thanks.

armada-3720-espressobin-v7.dts

Edited August 8, 20224 yr by YuriyKl

From armada-3720-espressobin.dtsi:128

Connector J17 and J18 expose a number of different features. Some pins are multiplexed. This is the case for instance for the following features:
 * - UART1 (pin 24 = RX, pin 26 = TX). See armada-3720-db.dts for an example of how to enable it. Beware that the signals are 1.8V TTL.

 

The db.dts:204 gives

/* CON26(V2.0)/CON28(V1.4) */
&uart1 {
    pinctrl-names = "default";
    pinctrl-0 = <&uart2_pins>;
    status = "okay";
};

 

uart0 and uart1 are defined in armada-37xx.dtsi.

 

So if you want to enable more than that, it sounds like multiple modifications, and I don't know any better how to help.

1 hour ago, ManoftheSea said:

The db.dts:204 gives

/* CON26(V2.0)/CON28(V1.4) */
&uart1 {
    pinctrl-names = "default";
    pinctrl-0 = <&uart2_pins>;
    status = "okay";
};

Should i add it to the end of dts file?

You should add that chunk of dts code to the original source device tree file and not into the decompiled device tree binary (which you attached into the first post).