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Re: Realtek GPIO chipset, for Baytrail?

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Hi Bastien,

> I have a tablet that seems to be using Realtek chips to do wireless
> communications (hopefully, this time I won't be wrong[1]).
> 
> The device, under the gpio class in /sys, shows with a modalias of
> "acpi:OBDA8723:" (that's on "O", not "0"). This seems to correspond to a
> Realtek chipset (Larry tells me it matches the PCI ID of 0bda:8723 for
> the RTL8723AE chipset).
> 
> It shows up under:
> /sys/devices/platform/80860F0A:00/subsystem/devices
> 
> Does anyone have details on how this chipset is actually hooked up? Can
> a portion of the existing RTL8723AE driver code be reused?

so after a little bit of digging, this seems to be the UART device for the Bluetooth chip. Can you try using 8250_dw.ko driver and see if it binds to it and you get a new serial port.

If I am correct then you have to run H:5 UART transport protocol to enable Bluetooth for this device.

Please double check that this ACPI tables really wrongly declare this as a Broadcom chip. This seems to be a firmware bug then. Unfortunately I think that for Broadcom you run H:4 UART transport protocol and for Realtek you have to run H:5 UART transport protocol. So no idea how to nicely differentiate these.

Regards

Marcel

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