linux-kernel - [PATCH v2 0/3] PWM framework: add support referencing PWMs from ACPI

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Date:   Wed, 12 Jun 2019 10:36:05 +0200
From:   Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Schmauss <erik.schmauss@...el.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Nikolaus Voss <nikolaus.voss@...wensteinmedical.de>,
        linux-acpi@...r.kernel.org, devel@...ica.org,
        linux-leds@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-kernel@...r.kernel.org, nv@...n.de
Subject: [PATCH v2 0/3] PWM framework: add support referencing PWMs from ACPI

As described in Documentation/firmware-guide/acpi/gpio-properties.rst a
GPIO can be referenced from ACPI ASL _DSD with the "gpios"-property of the
form:

  Package () { "gpios", Package () { ref, index, pin, active_low }}

The second patch of this series adds support for specifing a PWM
reference in ASL of the form

  Package () { "pwms", Package () { ref, index, pwm-period [, pwm flags]}}

The first patch of this series is necessary to resolve the "ref" in ASL
if the table has been loaded by efivar_ssdt_load() or configfs.

The third patch of this series makes leds-pwm use the ACPI-enabled
PWM framework.

v2:
- fixes by Pavel Machek and Dan Murphy

Nikolaus Voss (3):
  ACPI: Resolve objects on host-directed table loads
  PWM framework: add support referencing PWMs from ACPI
  leds-pwm.c: support ACPI via firmware-node framework

 drivers/acpi/acpi_configfs.c   |   6 +-
 drivers/acpi/acpica/tbxfload.c |  11 ++++
 drivers/leds/leds-pwm.c        |  45 +++++++------
 drivers/pwm/core.c             | 113 +++++++++++++++++++++++++++++++++
 include/linux/pwm.h            |   9 +++
 5 files changed, 161 insertions(+), 23 deletions(-)

-- 
2.17.1