Re: [PATCH 1/2] serdev: Add ACPI support

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On Tue, Oct 10, 2017 at 10:22:19AM +0200, Marcel Holtmann wrote:

> > Some of the above are minor nits that can be addressed by a follow-up
> > patch indeed, but the handling of nodes with no child devices needs to
> > be correct (or you could end up breaking normal serial-port support).
> 
> that sounds good to me as well. Lets get this feature into the ACPI
> tree since I am going to push Hans’ patches into bluetooth-next as
> soon as he re-submits the missing ID change. That hopefully gives us
> then fully serdev support for ACPI and DT when it comes to Broadcom
> Bluetooth controllers.

But with Hans's work these devices should continue to function using the
platform-device hacks until the ACPI patch eventually lands in Linus's
tree (via the acpi tree).

> Next step is to convert the Intel driver to also use ACPI based serdev
> :)
> 
> And for the brave, I think there are Realtek based systems using ACPI
> as well.
> 
> What I was wondering the other day is if we need a lsserdev tool or
> some integration in lshw to be able to debug what serdev devices and
> ID are present. The lsusb and /sys/kernel/debug/usb/devices is just
> super powerful and easy when it comes to figuring out what people have
> in their system. Maybe /sys/kernel/debug/serdev/devices could be
> helpful as well. Just thinking out loud here.

Yeah, maybe. Since you'd typically only have small number of serdev
devices (say, max 4), using /sys/bus/serial/devices directly should not
be too bad meanwhile. Not that much common information we can expose
either, at least not in comparison to USB. But I'll keep it mind. :)

Johan
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