Re: [PATCH] ptp: ocp: don't allow on S390

On Fri, Aug 13, 2021 at 10:30 PM Randy Dunlap [off-list ref] wrote:

Fix kconfig warning on arch/s390/:

WARNING: unmet direct dependencies detected for SERIAL_8250
  Depends on [n]: TTY [=y] && HAS_IOMEM [=y] && !S390 [=y]
  Selected by [m]:
  - PTP_1588_CLOCK_OCP [=m] && PTP_1588_CLOCK [=m] && HAS_IOMEM [=y] && PCI [=y] && SPI [=y] && I2C [=m] && MTD [=m]

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Jonathan Lemon <redacted>
---
There is no 8250 serial on S390. See commit 1598e38c0770.
Is this driver useful even without 8250 serial?

I think an easier way to do this would be to remove the
'select SERIAL_8250', I don't think that is actually a compile-time
dependency, just something that you normally want to enable
to make the device useful.

I would also suggest removing all the 'imply' statements, they
usually don't do what the original author intended anyway.
If there is a compile-time dependency with those drivers,
it should be 'depends on', otherwise they can normally be
left out.

       Arnd