Hi Carlo, >>> Some Realtek bluetooth devices need a "config" blob. The btrtl driver >>> currently only allows loading this config blob via the request_firmware >>> mechanism. >>> >>> The UART Bluetooth chips use this config blob to specify the baudrate, >>> whether flow control is used and some other unknown bits. This means >>> that the config blob is board-specific - thus loading it via >>> request_firmware means that the rootfs is tied to a specific board. >>> >>> The UART Bluetooth chips are implemented through serdev. This means >>> there is also a devicetree node which describes the Bluetooth chip. >>> Thus we can also load the blob from the devicetree node to keep the >>> filesystem independent of any board configuration data. In the future >>> this could be extended to support ACPI as well (in case that's needed). >>> >>> Parse the devicetree node if it exists and obtain the config blob from >>> there. Otherwise fall back to using the "old" request_firmware >>> mechanism. >> >> where are these config blobs coming from? I think we also need to give people a helping hand on how to add them to DT. I still wonder if the only pieces we are using are the UART config, then maybe skipping the config blob and allowing for clear named values in DT might be better. > > What about x86 platforms where we do not have DT (I didn't check but I > don't think that the UART config in that case is shipped in the ACPI > tables)? if we have this hardware in x86 systems, then I would really like to see ACPI table dumps. Some pieces might need hardcoding based on ACPI ID. Regards Marcel -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
