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

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Message-ID: <8c80495a-440e-05c6-22c8-cf05d4f6b611@ti.com>
Date:   Tue, 10 Sep 2019 13:38:18 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
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 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

JJ

>
>
> Daniel.