[PATCH v2 0/5] Change ISA_BUS_API dependency to selection

[William Breathitt Gray]

Changes in v2:
  - Remove select ISA_BUS_API line from ISA_BUS Kconfig option
  - Update ISA_BUS help text to reflect updated use
  - Add explicit EXPERT dependency for PC104 Kconfig option

The ISA_BUS_API Kconfig option enables the compilation of the ISA bus
driver. The ISA bus driver does not perform any hardware interaction,
and is instead just a thin layer of software abstraction to eliminate
boilerplate code common to ISA-style device drivers. Since ISA_BUS_API
has no dependencies and does not jeopardize the integrity of the system
when enabled, drivers should select it when the ISA bus driver
functionality is needed.

Originally, when the ISA_BUS_API Kconfig option was introduced, it
served a dual-purpose of masking drivers ISA-style devices not commonly
found for desktop systems, such as the PC/104 device drivers. This
secondary semantic was inappropriate for the ISA_BUS_API option, and
proper masking of these device drivers is now accomplished via dedicated
Kconfig options such as CONFIG_PC104.

Linus, please pickup this entire patchset through your GPIO subsystem
tree; a recursive dependency error is present if these patches are
cherry-picked (see https://lkml.org/lkml/2017/12/26/235), so they should
be merged together in the same tree.

Maciej, this patchset resolves the recursive dependency issue you
encountered, so now you should be able to submit your Winbond GPIO
driver with the ISA_BUS_API selection as desired.

William Breathitt Gray (5):
  iio: Change ISA_BUS_API dependency to selection
  watchdog: Change ISA_BUS_API dependency to selection
  gpio: Change ISA_BUS_API dependency to selection
  isa: Remove ISA_BUS_API selection for ISA_BUS
  pc104: Add EXPERT dependency for PC104 Kconfig option

 arch/x86/Kconfig            | 10 ++++++----
 drivers/gpio/Kconfig        | 14 +++++++++-----
 drivers/iio/adc/Kconfig     |  3 ++-
 drivers/iio/counter/Kconfig |  3 ++-
 drivers/iio/dac/Kconfig     |  3 ++-
 drivers/watchdog/Kconfig    |  3 ++-
 init/Kconfig                |  2 +-
 7 files changed, 24 insertions(+), 14 deletions(-)

-- 
2.15.1