linux-kernel - [PATCH v7 0/4] pwm: userspace support

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Message-ID: <cover.1746010245.git.u.kleine-koenig@baylibre.com>
Date: Wed, 30 Apr 2025 13:55:57 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: linux-pwm@...r.kernel.org
Cc: David Lechner <dlechner@...libre.com>,
	Kent Gibson <warthog618@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v7 0/4] pwm: userspace support

Hello,

after the feedback I got from David on v7[1] and some internal
discussion here comes a new version of the patch.

Apart from rebasing to a newer base (current pwm/for-next) the only
change in the relevant patch #4 about return values from the
PWM_IOCTL_SETEXACTWF ioctl. Instead of returning 1 if the request failed
to apply exactly, return -EDOM.

The earlier patches in this series prepare that and implement a
similar change in pwm_set_waveform_might_sleep() to simplify also other
users of this function. Patch #3 is only a documentation update that is
not strictly related to the userspace chardev, but reflects the changes
in patches #1 and #2.

Feedback welcome.

Best regards
Uwe

[1] https://lore.kernel.org/linux-pwm/20250416094316.2494767-2-u.kleine-koenig@baylibre.com

Uwe Kleine-König (4):
  pwm: Let pwm_set_waveform_might_sleep() fail for exact but impossible
    requests
  pwm: Let pwm_set_waveform_might_sleep() return 0 instead of 1 after
    rounding up
  pwm: Formally describe the procedure used to pick a hardware waveform
    setting
  pwm: Add support for pwmchip devices for faster and easier userspace
    access

 drivers/pwm/core.c       | 369 ++++++++++++++++++++++++++++++++++++---
 include/linux/pwm.h      |   3 +
 include/uapi/linux/pwm.h |  53 ++++++
 3 files changed, 404 insertions(+), 21 deletions(-)
 create mode 100644 include/uapi/linux/pwm.h

base-commit: e373991eb9ff0a9617634017c7f19fd36ec4f208
-- 
2.47.2