linux-kernel - Re: [PATCH v7 4/6] drivers: leds: Add the IEI WT61P803 PUZZLE LED driver

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Message-ID: <CADZsf3bChWDv02v=LR-abC5rNmh09JsdabWVLcuuWaOhejBBjg@mail.gmail.com>
Date:   Sun, 1 Nov 2020 10:34:14 +0100
From:   Luka Kovacic <luka.kovacic@...tura.hr>
To:     Pavel Machek <pavel@....cz>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-hwmon@...r.kernel.org,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>, Dan Murphy <dmurphy@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Marek Behun <marek.behun@....cz>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH v7 4/6] drivers: leds: Add the IEI WT61P803 PUZZLE LED driver

Hello Pavel,

On Thu, Oct 29, 2020 at 6:58 PM Pavel Machek <pavel@....cz> wrote:
>
> Hi!
>
> > Add support for the IEI WT61P803 PUZZLE LED driver.
> > Currently only the front panel power LED is supported,
> > since it is the only LED on this board wired through the
> > MCU.
> >
> > The LED is wired directly to the on-board MCU controller
> > and is toggled using an MCU command.
> >
> > Support for more LEDs is going to be added in case more
> > boards implement this microcontroller, as LEDs use many
> > different GPIOs.
>
> Not too bad.
>
> > This driver depends on the IEI WT61P803 PUZZLE MFD driver.
> >
> > Signed-off-by: Luka Kovacic <luka.kovacic@...tura.hr>
> > Cc: Luka Perkov <luka.perkov@...tura.hr>
> > Cc: Robert Marko <robert.marko@...tura.hr>
> > ---
> >  drivers/leds/Kconfig                    |   8 ++
> >  drivers/leds/Makefile                   |   1 +
> >  drivers/leds/leds-iei-wt61p803-puzzle.c | 161 ++++++++++++++++++++++++
> >  3 files changed, 170 insertions(+)
>
> Can you put it into drivers/leds/simple? You'll have to create it.

Sure, I'll move the driver there.

>
> > +++ b/drivers/leds/leds-iei-wt61p803-puzzle.c
> > @@ -0,0 +1,161 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
>
> Make sure this is consistent with MODULE_LICENSE("GPL");. GPLv2+ would
> be nicer if you can.

Okay, I'll see what I can do...
Although isn't it okay to use either GPL-2.0-only or GPL-2.0+ with
MODULE_LICENSE("GPL") as described in Documentation/process/license-rules.rst
on line 441?

>
> > +     struct mutex lock;
>
> Mutex is _way_ overkill for this. Please check that locking provided
> by LED core is not sufficient. If not, please use atomic_t or
> something.

Ok.

>
> Best regards,
>                                                                 Pavel
> --
> http://www.livejournal.com/~pavelmachek

Kind regards,
Luka