linux-kernel - [PATCH v2 0/2] Support for Osram as3668 LED driver

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Message-ID: <20250531120715.302870-4-linux@timmermann.space>
Date: Sat, 31 May 2025 14:07:16 +0200
From: Lukas Timmermann <linux@...mermann.space>
To: lee@...nel.org,
	pavel@...nel.org
Cc: linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Lukas Timmermann <linux@...mermann.space>
Subject: [PATCH v2 0/2] Support for Osram as3668 LED driver 

This is v2 of the patch series adding support for the as3668 LED driver. I am sending v2 because I discovered major issues in v1 that required correction before review.

This patch adds basic support for the as3668 driver IC via I2C interface. The IC is capable of driving four individual LEDs up to 25.5mA per channel. Hardware blinking would be theoretically possible, but this chip only supports a few set on/off-delays which makes using that feature unfeasable, therefore my driver doesn't offer that capability. It's intended applications is in mobile devices such as phones, tablets and cameras. This driver was tested and is working on a samsung-manta which is running postmarketOS with a near mainline kernel.

Please note: This is my first suggested patch to the kernel. checkpatch.pl runs without warnings or errors. I've read the docs in regards to the led subsystem, coding style and submission of patches, but I'm still a bit unsure about the general workflow. I will try my best.

Changes in v2:
- Fixed reading led subnodes in dt incorrectly, which caused wrong numbering and a segfault when removing the driver module
- Fixed calling of_property_read_u8 with an int, causing a compiler error
- Added more error checking during writes to the i2c bus
- Link to v1: https://lore.kernel.org/linux-leds/20250530184219.78085-3-linux@timmermann.space/

Lukas Timmermann (2):
  leds: as3668: Driver for the ams Osram 4-channel i2c LED driver
  dt-bindings: leds: Add new as3668 support

 .../devicetree/bindings/leds/leds-as3668.yaml |  76 +++++++
 drivers/leds/Kconfig                          |  10 +
 drivers/leds/Makefile                         |   1 +
 drivers/leds/leds-as3668.c                    | 192 ++++++++++++++++++
 4 files changed, 279 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-as3668.yaml
 create mode 100644 drivers/leds/leds-as3668.c

-- 
2.49.0