Hi Ayush, On Wed, 8 Jan 2025 13:58:04 +0530 Ayush Singh <ayush@xxxxxxxxxxxxxxx> wrote: ... > > I will experiment with adding support to dtc and see how things look. > Hopefully, 2025 is the year of addon board support. > Also one point different between fdtoverlay an runtime loading is that runtime loading allows to set the target node of the overlay at runtime. For instance, on LAN966X PCI driver, an overlay is loaded and applied on a PCI device node. The overlay loading is done by the PCI driver device: https://elixir.bootlin.com/linux/v6.13-rc1/source/drivers/misc/lan966x_pci.c#L131 The overlay loaded is the following one: https://elixir.bootlin.com/linux/v6.13-rc1/source/drivers/misc/lan966x_pci.dtso For addon boards, this feature is also useful because without any modification in the overlay itself, it can be applied on the correct connector. This allows to support, without any overlay modification the following cases: - A base board with multiple connectors where an addon board can be connected. - An addon board with its own DT overlay used on different base board This feature is not supported by fdtoverlay. Maybe something like fdtoverlay --base=/somewhere/my_connector could be implemented in fdtoverlay in order to choose the node where the overlay has to be applied. Best regards, Hervé
