Re: [RFC v2 7/9] bluetooth: btrtl: load the config blob from devicetree when available

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




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



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux