How to enable uart2/uart4 in dtc file?

[YuriyKl]

 

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, 2022 by YuriyKl

[ManoftheSea]

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.

[YuriyKl]

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?

[Pali]

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).