linux-kernel - [PATCH v5 0/2] Panasonic AN30259A support

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Date:   Sun,  9 Sep 2018 20:38:23 +1000
From:   Simon Shields <simon@...eageos.org>
To:     linux-leds@...r.kernel.org
Cc:     Simon Shields <simon@...eageos.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v5 0/2] Panasonic AN30259A support

Hi,

This patch series adds DT bindings (patch #1) and the corresponding driver
(patch #2) for the Panasonic AN30259A 3-channel LED driver. AN30259A
uses an internal clock for controlling brightness/on-off cycles, but
also supports using an external PWM/clock input. This patch series only
implements support for the former.

The AN30259A is connected using I2C, and the datasheet is freely
available[0].

Changes since v4 (mistakenly sent as v3):
* Rebased on v4.19-rc2
* Namespace all macros with AN30259A_ prefix
* Fix trivial compiler/checkpatch --strict warnings

Changes since v3:
* Rebased on v4.18-rc3.
* Drop unnecessary DUTYMAX/MID calculations when blinking:
 previously I'd thought that the PWM duty values were expressed
 as a percentage of the maximum current output, but in reality
 they're a percentage of the current set in the LEDxCC registers.
This simplifies the code quite a bit.
* Corrected MODULE_LICENSE declaration.
* Return -EINVAL from set_blink if the blink rate is unsupported in
 hardware.
* Fix more checkpatch --strict issues.

Changes since v2:
* Drop "an30259a:" prefix from bindings and add it in the device driver
 instead.
* Use led-controller instead of leds for sample DT binding.
* Use ":indicator" instead of ":notification" in sample DT binding.
* Merge an30259a_led_set and an30259a_brightness to
 an30259a_brightness_set (and same for blink functions).
* Explain the range limitations of the AN30259A's sloping mode
 in the code - the AN30259A only has a 7-bit PWM range in slope mode,
 and the bottom 3 bits are always set.

Changes since v1:
* Documentation formatting/grammar fixes.
* Use reg property instead of led-sources for leds.
* Add default-state support.
* Fix auto-probing when built as a module.
* Simplified DT parsing code.
* Use devm version of led_class_register().
* Fix LED naming scheme.
* Fixed checkpatch --strict issues.

Cheers,
Simon

[0]: https://www.alliedelec.com/m/d/a9d2b3ee87c2d1a535a41dd747b1c247.pdf

Simon Shields (2):
  dt-bindings: leds: document Panasonic AN30259A bindings
  leds: add Panasonic AN30259A support

 .../bindings/leds/leds-an30259a.txt           |  43 ++
 drivers/leds/Kconfig                          |  10 +
 drivers/leds/Makefile                         |   1 +
 drivers/leds/leds-an30259a.c                  | 368 ++++++++++++++++++
 4 files changed, 422 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-an30259a.txt
 create mode 100644 drivers/leds/leds-an30259a.c

-- 
2.18.0