linux-kernel - Re: [PATCH 2/2] leds: lp5024: Add the LP5024/18 RGB LED driver

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Date:   Wed, 19 Dec 2018 21:10:47 +0100
From:   Pavel Machek <pavel@....cz>
To:     Dan Murphy <dmurphy@...com>
Cc:     robh+dt@...nel.org, jacek.anaszewski@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org
Subject: Re: [PATCH 2/2] leds: lp5024: Add the LP5024/18 RGB LED driver

On Wed 2018-12-19 13:41:18, Dan Murphy wrote:
> Pavel
> 
> Thanks for the review.
> 
> On 12/19/2018 01:34 PM, Pavel Machek wrote:
> > Hi!
> > 
> >> +static DEVICE_ATTR_WO(ctrl_bank_a_mix);
> >> +static DEVICE_ATTR_WO(ctrl_bank_b_mix);
> >> +static DEVICE_ATTR_WO(ctrl_bank_c_mix);
> >> +
> >> +static struct attribute *lp5024_ctrl_bank_attrs[] = {
> >> +	&dev_attr_ctrl_bank_a_mix.attr,
> >> +	&dev_attr_ctrl_bank_b_mix.attr,
> >> +	&dev_attr_ctrl_bank_c_mix.attr,
> >> +	NULL
> >> +};
> >> +ATTRIBUTE_GROUPS(lp5024_ctrl_bank);
> > 
> > ...
> >> +
> >> +static DEVICE_ATTR_WO(led1_mix);
> >> +static DEVICE_ATTR_WO(led2_mix);
> >> +static DEVICE_ATTR_WO(led3_mix);
> >> +
> >> +static struct attribute *lp5024_led_independent_attrs[] = {
> >> +	&dev_attr_led1_mix.attr,
> >> +	&dev_attr_led2_mix.attr,
> >> +	&dev_attr_led3_mix.attr,
> >> +	NULL
> >> +};
> >> +ATTRIBUTE_GROUPS(lp5024_led_independent);
> > 
> > Ok, so you are adding new sysfs files. Are they _really_ neccessary?
> > We'd like to have uniform interfaces for the leds.
> 
> Yes I am adding these for this driver.
> They adjust the individual brightness of each LED connected (what the HW guys called mixing).
> 
> The standard brightness sysfs adjusts all 3 LEDs simultaneously so that all 3 LEDs brightness are
> uniform.

1 LED, 1 brightness file... that's what we do. Why should this one be different?

> I did not think these belonged in the dt as they should be user space configurable
> 
> > 
> > If they are neccessary, we need documentation for them.
> 
> Sure I have no problem documenting them but where do I do that?
> I am assuming Documentation/leds/leds-lp5024.txt

Documentation/abi/...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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