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From: Pavel Machek <pavel@ucw.cz>
To: Dan Murphy <dmurphy@ti.com>
Cc: jacek.anaszewski@gmail.com, linux-leds@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH v17 00/17] Multi Color LED Framework
Date: Tue, 25 Feb 2020 11:19:40 +0100
Message-ID: <20200225101940.GB16252@amd> (raw)
In-Reply-To: <42d9687b-b488-22cf-0e9a-ff635b2094e3@ti.com>


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Hi!

> >   leds: lp5521: Add multicolor framework multicolor brightness support
> >   leds: lp55xx: Fix checkpatch file permissions issues
> >   leds: lp5523: Fix checkpatch issues in the code
> >   dt: bindings: Update lp55xx binding to recommended LED naming
> 
> I have no open comments on this patchset except for a DT change requested by
> Shawn Gao but this change should wait till after this patchset is merged.
> 
> Is there something holding this up?

Yes... my time; sorry about that.

The fact that it changes API makes it important to get it right, and
hard/impossible to fix it once it is merged... and I don't think this
is the right interface (sorry).

In particular, I don't think having directory per channel is a good
idea. It makes atomic updates impossible (minor), but will also
increase memory consuption (to a point where led-per-channel might
be cheaper), and will make userspace do 3x ammount of syscalls in the
common case.

And we can do better; sysfs files with arrays are okay. So I'd like to
see

channel_intensity (file containing array of u32's)

channel_names (usually containing "red green blue")

(I'm not sure if max_intensity is good idea; i believe we could simply
fix it to UINT32_MAX without bad effects).

And yes, I realize I should have spoken up sooner / more
forcefully. Sorry again.

Best regards,

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

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  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-27 15:00 Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 01/17] dt-bindings: leds: Add multicolor ID to the color ID list Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 02/17] " Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 03/17] leds: multicolor: Introduce a multicolor class definition Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 04/17] dt: bindings: lp50xx: Introduce the lp50xx family of RGB drivers Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 05/17] leds: lp50xx: Add the LP50XX family of the RGB LED driver Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 06/17] dt: bindings: lp55xx: Be consistent in the document with LED acronym Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 07/17] dt: bindings: lp55xx: Update binding for Multicolor Framework Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 08/17] ARM: dts: n900: Add reg property to the LP5523 channel node Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 09/17] ARM: dts: imx6dl-yapp4: Add reg property to the lp5562 " Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 10/17] ARM: dts: ste-href: Add reg property to the LP5521 channel nodes Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 11/17] leds: lp55xx: Convert LED class registration to devm_* Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 12/17] leds: lp55xx: Add multicolor framework support to lp55xx Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 13/17] leds: lp5523: Update the lp5523 code to add multicolor brightness function Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 14/17] leds: lp5521: Add multicolor framework multicolor brightness support Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 15/17] leds: lp55xx: Fix checkpatch file permissions issues Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 16/17] leds: lp5523: Fix checkpatch issues in the code Dan Murphy
2020-01-27 15:00 ` [RESEND PATCH v17 17/17] dt: bindings: Update lp55xx binding to recommended LED naming Dan Murphy
2020-02-12 13:09 ` [RESEND PATCH v17 00/17] Multi Color LED Framework Dan Murphy
2020-02-25 10:19   ` Pavel Machek [this message]
2020-02-25 22:17     ` Jacek Anaszewski
2020-02-25 22:44       ` Dan Murphy
2020-02-26 12:59       ` Pavel Machek
2020-02-26 20:45         ` Jacek Anaszewski
2020-02-26 22:10           ` Dan Murphy
2020-02-27 10:58           ` Pavel Machek
2020-02-27 12:43             ` Greg KH
2020-02-27 13:07               ` Dan Murphy
2020-02-27 13:29                 ` Dan Murphy
2020-02-27 21:22                 ` Jacek Anaszewski
2020-02-28  7:42                   ` Greg KH
2020-02-28  9:34                     ` Pavel Machek
2020-02-28 12:30                     ` Dan Murphy
2020-02-28  9:39                   ` Pavel Machek

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