linux-kernel - [PATCH v2 0/3] Add synchronous fake device creation utility for GPIO drivers

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Message-ID: <20250218160333.605829-1-koichiro.den@canonical.com>
Date: Wed, 19 Feb 2025 01:03:30 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: linux-gpio@...r.kernel.org
Cc: brgl@...ev.pl,
	geert+renesas@...der.be,
	linus.walleij@...aro.org,
	maciej.borzecki@...onical.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] Add synchronous fake device creation utility for GPIO drivers

This patch series introduces a utility for some GPIO devices to reduce
code duplication. There are no functional changes.

In this series, only gpio-sim and gpio-virtuser are updated to use
dev-sync-probe, as the current gpio-aggregator does not benefit from it at
all. A follow-up patch series that introduces a configfs interface for
gpio-aggregator will convert it to use dev-sync-probe as well.

This work originated from a suggestion by Bartosz:
https://lore.kernel.org/all/CAMRc=MfcooZXBqVpbQ0ak+8LGsPDzwKSN3Zfb0eZDx1Bx4duzQ@mail.gmail.com/

N.B. this submission is based on the latest gpio/for-next as of writing:
f04867a5d0d3 ("gpio: loongson-64bit: Remove unneeded ngpio assignment").


v1->v2 changes:
  - Renamed the files (gpio-pseudo.[ch] -> dev-sync-probe.[ch]).
  - Renamed the helper functions and a struct.
  - Fixed Kconfig (correcting bool to tristate, etc.).
  - Fixed Copyright.
  - Added some missing #include.

v1: https://lore.kernel.org/all/20250217142758.540601-1-koichiro.den@canonical.com/


Koichiro Den (3):
  gpio: introduce utilities for synchronous fake device creation
  gpio: sim: convert to use dev-sync-probe utilities
  gpio: virtuser: convert to use dev-sync-probe utilities

 drivers/gpio/Kconfig          | 10 ++++
 drivers/gpio/Makefile         |  3 ++
 drivers/gpio/dev-sync-probe.c | 96 +++++++++++++++++++++++++++++++++++
 drivers/gpio/dev-sync-probe.h | 25 +++++++++
 drivers/gpio/gpio-sim.c       | 84 +++++-------------------------
 drivers/gpio/gpio-virtuser.c  | 73 ++++----------------------
 6 files changed, 156 insertions(+), 135 deletions(-)
 create mode 100644 drivers/gpio/dev-sync-probe.c
 create mode 100644 drivers/gpio/dev-sync-probe.h

-- 
2.45.2