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

From: Daniel Thompson
Date: Tue Sep 10 2019 - 07:39:37 EST


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@xxxxxx>
> > > + *
> > > + * 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.