[PATCH v2 0/6] gpio: Implement and utilize register structures for ISA drivers

[William Breathitt Gray <william.gray@linaro.org>]

Changes in v2:
 - Implement support for the Intel 8255 interface as a new gpio-i8255
   module; common code among gpio-104-dio-48e, gpio-104-idi-48, and
   gpio-gpio-mm are consolidated in the gpio-i8255 module
 - Refactor the gpio-104-dio-48e, gpio-104-idi-48, and gpio-gpio-mm to
   utilize the new gpio-i8255 functions; this greatly simplifies the
   changes for these drivers

The PC104/ISA drivers were updated to use I/O memory accessor calls such
as ioread8()/iowrite8() in a previous patch series [1]. This
patchset is a continuation of the effort to improve the code readability
and reduce magic numbers by implementing and utilizing named register
data structures.

One of the benefits is that we can now observe more easily similarities
in devices that share similar interfaces; such as the i8255 interfaces
used by the 104-DIO-48E, 104-IDI-48, and GPIO-MM drivers -- as well as
the similar interface used by the 104-IDIO-16 and PCI-IDIO-16 drivers.

A new module supporting the Intel 8255 interface is introduced to
consolidate the common code found among the 104-DIO-48E, 104-IDI-48, and
GPIO-MM drivers.

[1] https://lore.kernel.org/all/cover.1652201921.git.william.gray@linaro.org/

William Breathitt Gray (6):
  gpio: i8255: Introduce the i8255 module
  gpio: 104-dio-48e: Implement and utilize register structures
  gpio: 104-idi-48: Implement and utilize register structures
  gpio: gpio-mm: Implement and utilize register structures
  gpio: 104-idio-16: Implement and utilize register structures
  gpio: ws16c48: Implement and utilize register structures

 MAINTAINERS                     |   6 +
 drivers/gpio/Kconfig            |   6 +
 drivers/gpio/Makefile           |   1 +
 drivers/gpio/gpio-104-dio-48e.c | 224 +++++++++-------------------
 drivers/gpio/gpio-104-idi-48.c  | 123 +++++++---------
 drivers/gpio/gpio-104-idio-16.c |  58 +++++---
 drivers/gpio/gpio-gpio-mm.c     | 177 +++++------------------
 drivers/gpio/gpio-i8255.c       | 249 ++++++++++++++++++++++++++++++++
 drivers/gpio/gpio-ws16c48.c     | 119 ++++++++++-----
 include/linux/gpio/i8255.h      |  34 +++++
 10 files changed, 575 insertions(+), 422 deletions(-)
 create mode 100644 drivers/gpio/gpio-i8255.c
 create mode 100644 include/linux/gpio/i8255.h


base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56
-- 
2.36.1