linux-kernel - [PATCH v4 0/6] Add a multicolor LED driver for groups of monochromatic LEDs

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Message-ID: <20221007145641.3307075-1-jjhiblot@traphandler.com>
Date:   Fri, 7 Oct 2022 16:56:35 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     <lee.jones@...aro.org>, <pavel@....cz>, <robh+dt@...nel.org>,
        <sven.schwermer@...ruptive-technologies.com>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <johan+linaro@...nel.org>, <marijn.suijten@...ainline.org>,
        <bjorn.andersson@...aro.org>, <andy.shevchenko@...il.com>,
        <jacek.anaszewski@...il.com>, <linux-leds@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: [PATCH v4 0/6] Add a multicolor LED driver for groups of monochromatic LEDs


Some HW design implement multicolor LEDs with several monochromatic LEDs.
Grouping the monochromatic LEDs allows to configure them in sync and use
the triggers.
The PWM multicolor LED driver implements such grouping but only for
PWM-based LEDs. As this feature is also desirable for the other types of
LEDs, this series implements it for any kind of LED device.

changes v2->v3, only minor changes:
 - rephrased the Kconfig descritpion
 - make the sysfs interface of underlying LEDs read-only only if the probe
   is successful.
 - sanitize the header files
 - removed the useless call to dev_set_drvdata()
 - use dev_fwnode() to get the fwnode to the device.

changes v1->v2:
 - Followed Rob Herrings's suggestion to make the dt binding much simpler.
 - Added a patch to store the color property of a LED in its class
   structure (struct led_classdev).

Jean-Jacques Hiblot (6):
  devres: provide devm_krealloc_array()
  leds: class: simplify the implementation of devm_of_led_get()
  leds: provide devm_of_led_get_optional()
  leds: class: store the color index in struct led_classdev
  dt-bindings: leds: Add binding for a multicolor group of LEDs
  leds: Add a multicolor LED driver to group monochromatic LEDs

 Documentation/ABI/testing/sysfs-class-led     |   9 ++
 .../bindings/leds/leds-group-multicolor.yaml  |  64 ++++++++
 drivers/leds/led-class.c                      |  65 ++++++--
 drivers/leds/rgb/Kconfig                      |  10 ++
 drivers/leds/rgb/Makefile                     |   1 +
 drivers/leds/rgb/leds-group-multicolor.c      | 152 ++++++++++++++++++
 include/linux/device.h                        |  13 ++
 include/linux/leds.h                          |   3 +
 8 files changed, 303 insertions(+), 14 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-group-multicolor.yaml
 create mode 100644 drivers/leds/rgb/leds-group-multicolor.c

-- 
2.25.1