linux-kernel - Re: [PATCH v5 4/4] backlight: add led-backlight driver

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Date:   Tue, 10 Sep 2019 12:39:31 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Jean-Jacques Hiblot <jjhiblot@...com>
Cc:     jacek.anaszewski@...il.com, pavel@....cz, robh+dt@...nel.org,
        mark.rutland@....com, lee.jones@...aro.org, dmurphy@...com,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        dridevel@...ts.freedesktop.org, tomi.valkeinen@...com
Subject: Re: [PATCH v5 4/4] backlight: add led-backlight driver

On Tue, Sep 10, 2019 at 01:38:18PM +0200, Jean-Jacques Hiblot wrote:
> 
> On 10/09/2019 13:26, Daniel Thompson wrote:
> > 
> > >   endmenu
> > > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> > > index 63c507c07437..2a67642966a5 100644
> > > --- a/drivers/video/backlight/Makefile
> > > +++ b/drivers/video/backlight/Makefile
> > > @@ -57,3 +57,4 @@ obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o
> > >   obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o
> > >   obj-$(CONFIG_BACKLIGHT_ARCXCNN) 	+= arcxcnn_bl.o
> > >   obj-$(CONFIG_BACKLIGHT_RAVE_SP)		+= rave-sp-backlight.o
> > > +obj-$(CONFIG_BACKLIGHT_LED)		+= led_bl.o
> > > diff --git a/drivers/video/backlight/led_bl.c b/drivers/video/backlight/led_bl.c
> > > new file mode 100644
> > > index 000000000000..a72456e11fb9
> > > --- /dev/null
> > > +++ b/drivers/video/backlight/led_bl.c
> > > @@ -0,0 +1,264 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Copyright (C) 2015-2019 Texas Instruments Incorporated -  http://www.ti.com/
> > > + * Author: Tomi Valkeinen <tomi.valkeinen@...com>
> > > + *
> > > + * Based on pwm_bl.c
> > > + */
> > > +
> > > +#include <linux/backlight.h>
> > > +#include <linux/gpio/consumer.h>
> > Maybe this is a nitpick but it is one I have now raised three times and
> > I don't recall any response, what symbols from this header are used in
> > this file?
> > 
> > AFAICT everything defined in this header includes the string "gpio" and
> > that string doesn't appear anywhere in the file (except this line).
> > 
> > 
> > > +#include <linux/leds.h>
> > > +#include <linux/module.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/slab.h>
> > Come to think of it, are you sure you need this include? devm_kzalloc()
> > doesn't comes from this file.
> > 
> > 
> > > +#define BKL_FULL_BRIGHTNESS 255
> > This is unused. Please remove.
> > 
> > 
> > Other than that, looks good!
> 
> Thanks for the quick review. I forgot to cleanup the headers. I'll fix that
> now

I felt I owed it to this patch series after my performance so far this
dev cycle!


Daniel.