Re: [PATCH v2 9/9] Bluetooth: hci_bcm: Add (runtime)pm support to the serdev driver

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On Mon, Oct 09, 2017 at 04:02:24PM +0200, Hans de Goede wrote:
> Hi,
> 
> On 07-10-17 16:26, Johan Hovold wrote:

> > However, there are of course a couple of caveats. Once Frederic's ACPI
> > patches land, there will be no more platform child devices. Unless
> > serdev support is then compiled in, this means that PM will break
> > (silently). And if serdev is enabled, of course the tty class device is
> > gone and hciattach (btattach) will fail, but I guess everyone is aware
> > of that issue by now.
> > 
> > Should BT_HCIUART_BCM start depending on SERIAL_DEV_CTRL_TTYPORT (when
> > ACPI is enabled) to avoid such silent breakage once ACPI-support is
> > merged?
> 
> It seems that this was answered already in further discussions and
> your recent patch to add a default y to SERIAL_DEV_CTRL_TTYPORT fixes
> this, right ?

Only partially, as the serdev bus code could still be built as a module,
which would prevent SERIAL_DEV_CTRL_TTYPORT from being selected.

We could consider having BT_HCIUART_BCM depend on
SERIAL_DEV_CTRL_TTYPORT (or !ACPI || SERIAL_DEV_CTRL_TTYPORT) just to
avoid any hard-to-detect regressions.

Johan
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