linux-kernel - Re: [PATCH v7 0/6] Add a multicolor LED driver for groups of monochromatic LEDs

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Date:   Wed, 22 Feb 2023 15:04:48 +0000
From:   Lee Jones <lee@...nel.org>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     pavel@....cz, robh+dt@...nel.org,
        sven.schwermer@...ruptive-technologies.com,
        krzysztof.kozlowski+dt@...aro.org, johan+linaro@...nel.org,
        marijn.suijten@...ainline.org, andy.shevchenko@...il.com,
        jacek.anaszewski@...il.com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 0/6] Add a multicolor LED driver for groups of
 monochromatic LEDs

On Mon, 20 Feb 2023, Jean-Jacques Hiblot wrote:

> Hi Pavel,
> 
> Would you be kind enough and have a look at this series ? It may not be the
> prettiest series of all,  but the feature make senses as it provides an
> atomic way of handling color leds from user space.
> 
> Any feedback would be appreciated.

If Pavel doesn't get back to you soon, I'll do my best to take a look
through.

> On 09/01/2023 18:19, Lee Jones wrote:
> > On Mon, 02 Jan 2023, Jean-Jacques Hiblot wrote:
> > > 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.
> > Another for Pavel.
> > > changes v6->v7:
> > >   - in led_mcg_probe() increment the counter at the end of the loop for
> > >     clarity.
> > > 
> > > changes v5->v6:
> > >   - restore sysfs access to the leds when the device is removed
> > > 
> > > changes v4->v5:
> > >   - Use "depends on COMPILE_TEST || OF" in Kconfig to indicate that OF
> > >     is a functional requirement, not just a requirement for the
> > >     compilation.
> > >   - in led_mcg_probe() check if devm_of_led_get_optional() returns an
> > >     error before testing for the end of the list.
> > >   - use sysfs_emit() instead of sprintf() in color_show().
> > >   - some grammar fixes in the comments and the commit logs.
> > > 
> > > 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      | 166 ++++++++++++++++++
> > >   include/linux/device.h                        |  13 ++
> > >   include/linux/leds.h                          |   3 +
> > >   8 files changed, 317 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
> > > 

-- 
Lee Jones [李琼斯]