Hi Martin, > 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. I might have asked before, but can we get a userspace similar to nokfw included in bluez.git that can parse and maybe even create/modify these blobs. 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
