On 2024-11-11 10:54, Ayush Singh wrote:
Allow appending values to a property instead of overriding the previous
values of property.
Currently, we have /delete-node/ and /delete-property/, but lack
/append-property/. Hence we end up having to repeat all existing values
when appending to a property (e.g. see [1] appending to clocks from
[2]).
This functionality is also important for creating a device tree based
implementation to support different types of addon-boards such as
mikroBUS, Grove [3], etc.
In practice, it looks as follows:
```
dts-v1/;
/ {
str-prop = "0";
};
/ {
/append-property/ str-prop = "1";
};
```
If we add /append-property/, why not add /prepend-property/ as well?
This is not only "nice for consistency", but it would also enable
solving a problem where SoC compatible strings from dtsi [1] need to be
repeated in board dts [2], because one cannot prepend to an existing
property.
```
dts-v1/;
/ {
compatible = "soc-vendor,soc1234";
};
/ {
/prepend-property/ compatible = "board-vendor,board-xyz";
};
```
What do you think?
[1]
https://elixir.bootlin.com/linux/v6.12.4/source/arch/arm64/boot/dts/renesas/r8a77951.dtsi#L18
[2]
https://elixir.bootlin.com/linux/v6.12.4/source/arch/arm64/boot/dts/renesas/r8a77951-salvator-xs.dts#L14
