From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: "Vesa Jääskeläinen" <dachaac@gmail.com>, "Pavel Machek" <pavel@ucw.cz>
Cc: Dan Murphy <dmurphy@ti.com>,
robh+dt@kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org
Subject: Re: [PATCH 2/2] leds: lp5024: Add the LP5024/18 RGB LED driver
Date: Mon, 7 Jan 2019 22:13:59 +0100 [thread overview]
Message-ID: <38daf022-e4e4-799d-4c75-ee851315290d@gmail.com> (raw)
In-Reply-To: <90a2ed79-b437-af14-4538-430d8723cc6b@gmail.com>
Hi Vesa,
On 1/5/19 1:39 AM, Vesa Jääskeläinen wrote:
> Hi Jacek,
>
> On 04/01/2019 23.37, Jacek Anaszewski wrote:
>> But, aside from that hypothetic issue, we need a solution for
>> LEDn_BRIGHTNESS feature of lp5024, i.e. setting color intensity
>> via a single register write. How would you propose to address that?
>
> You could model it to something like this in device tree:
>
> led-module @ <i2c-address> {
> compatible = "lp5024";
>
> // There is in hardware setup to use either linear or
> // logarithmic scaling:
> //enable-logarithmic-brightness;
>
> led0 {
> // this will create led instance for LED0 in lp5024
> label = "lp-led0";
>
> // This specifies LED number within lp5024
> led-index = <0>; // set output-base as 0*3 == 0
>
> element-red {
> // refers to OUT0
> output-offset = <0>;
> };
>
> element-green {
> // refers to OUT1
> output-offset = <1>;
> };
>
> element-blue {
> // refers to OUT2
> output-offset = <2>;
> };
>
> };
>
> led1 {
> // this will create led instance for LED1 in lp5024
> label = "lp-led1";
>
> // This specifies LED number within lp5024
> led-index = <1>; // set output-base as 1*3 == 3
>
> element-red {
> // refers to OUT3
> output-offset = <0>;
> };
>
> element-green {
> // refers to OUT4
> output-offset = <1>;
> };
>
> element-blue {
> // refers to OUT5
> output-offset = <2>;
> };
>
> };
>
> bank-led {
> // this will create led instance for bank leds in lp5024
> label = "lp-bank-led";
>
> // configured bank led configuration
> led-index = <2 3 4 5 6 7>;
> // As here is list of led-indices this entry is
> // assumed to be bank configuration. Bank mode is enable
> // for the indices.
>
> // set output-base as BANK A
>
> element-red {
> // refers to BANK A
> output-offset = <0>;
> };
>
> element-green {
> // refers to BANK B
> output-offset = <1>;
> };
>
> element-blue {
> // refers to BANK C
> output-offset = <2>;
> };
> };
> };
>
> This would then create three led instances and each led instance has
> brightness setting and that goes straight to hardware.
>
> If one would want to override hardware control for brightness then I
> suppose you would define in led node something like:
>
> brightness-model = "hsl"
>
> This would then pick red, green and blue elements for hsl calculations
> and others color elements for linear. LED specific hardware brightness
> would then be either 0 or 0xFF depending if all of LED color elements
> are zero or not.
>
> Would that kind of model work?
I'd prefer to have single RGB LED device. And your DT design
is unnecessarily complex and a bit confusing.
Also, you provided scarce information about sysfs interface.
It would be nice to see the sequence of commands.
--
Best regards,
Jacek Anaszewski
next prev parent reply other threads:[~2019-01-07 21:14 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-19 16:26 [PATCH 0/2] LP5024/18 LED introduction Dan Murphy
2018-12-19 16:26 ` [PATCH 1/2] dt: bindings: lp5024: Introduce the lp5024 and lp5018 RGB driver Dan Murphy
2018-12-28 23:53 ` Rob Herring
2018-12-31 18:54 ` Dan Murphy
2019-01-08 20:33 ` Jacek Anaszewski
2019-01-08 20:53 ` Dan Murphy
2019-01-08 21:16 ` Jacek Anaszewski
2019-01-08 21:22 ` Dan Murphy
2019-01-09 20:12 ` Jacek Anaszewski
2019-01-09 21:12 ` Dan Murphy
2019-01-09 21:28 ` Jacek Anaszewski
2019-01-09 21:31 ` Dan Murphy
2019-01-10 18:44 ` Jacek Anaszewski
2019-01-10 19:22 ` Dan Murphy
2019-01-10 19:57 ` Jacek Anaszewski
2019-01-10 20:43 ` Dan Murphy
2019-01-10 22:03 ` Jacek Anaszewski
2019-01-10 23:51 ` Dan Murphy
2019-01-11 12:38 ` Dan Murphy
2019-01-11 21:52 ` Jacek Anaszewski
2019-01-12 17:09 ` Dan Murphy
2019-01-12 19:48 ` Jacek Anaszewski
2019-01-14 12:27 ` Dan Murphy
2019-01-14 20:11 ` Jacek Anaszewski
2019-01-14 20:14 ` Dan Murphy
2019-01-14 20:28 ` Jacek Anaszewski
2019-01-14 20:29 ` Dan Murphy
2018-12-19 16:26 ` [PATCH 2/2] leds: lp5024: Add the LP5024/18 RGB LED driver Dan Murphy
2018-12-19 19:04 ` Dan Murphy
2018-12-19 19:34 ` Pavel Machek
2018-12-19 19:41 ` Dan Murphy
2018-12-19 20:10 ` Pavel Machek
2018-12-19 20:41 ` Dan Murphy
2018-12-19 21:36 ` Jacek Anaszewski
2018-12-19 21:50 ` Dan Murphy
2018-12-20 12:40 ` Vesa Jääskeläinen
2018-12-20 13:56 ` Dan Murphy
2019-01-01 13:45 ` Vesa Jääskeläinen
2019-01-03 22:05 ` Jacek Anaszewski
2019-01-03 23:19 ` Vesa Jääskeläinen
2019-01-03 23:34 ` Pavel Machek
2019-01-04 19:49 ` Vesa Jääskeläinen
2019-01-04 20:43 ` Pavel Machek
2019-01-04 19:12 ` Jacek Anaszewski
2019-01-04 20:12 ` Pavel Machek
2019-01-04 21:37 ` Jacek Anaszewski
2019-01-04 22:07 ` Pavel Machek
2019-01-05 12:16 ` Jacek Anaszewski
2019-01-05 12:31 ` Pavel Machek
2019-01-05 13:16 ` Jacek Anaszewski
2019-01-05 22:12 ` Generic RGB LED support was " Pavel Machek
2019-01-06 15:52 ` Jacek Anaszewski
2019-01-07 19:13 ` Jacek Anaszewski
2019-01-07 19:36 ` Dan Murphy
2019-01-07 20:59 ` Jacek Anaszewski
2019-01-07 21:14 ` Dan Murphy
2019-01-08 21:18 ` Jacek Anaszewski
2019-01-08 21:25 ` Dan Murphy
2019-01-10 12:46 ` Dan Murphy
2019-01-10 19:23 ` Jacek Anaszewski
2019-01-10 19:58 ` Dan Murphy
2019-01-10 21:02 ` Jacek Anaszewski
2019-01-10 21:07 ` Dan Murphy
2019-01-08 22:59 ` Pavel Machek
2019-01-09 7:11 ` Vesa Jääskeläinen
2019-01-13 16:37 ` Jacek Anaszewski
2019-01-05 0:39 ` Vesa Jääskeläinen
2019-01-07 19:34 ` Dan Murphy
2019-01-09 6:20 ` Vesa Jääskeläinen
2019-01-07 21:13 ` Jacek Anaszewski [this message]
2019-01-07 21:15 ` Dan Murphy
2019-01-09 6:46 ` Vesa Jääskeläinen
2019-01-13 16:36 ` Jacek Anaszewski
2018-12-20 20:31 ` Jacek Anaszewski
2018-12-21 7:32 ` Jacek Anaszewski
2018-12-21 13:05 ` Dan Murphy
2018-12-29 18:28 ` Jacek Anaszewski
2018-12-29 19:07 ` Pavel Machek
2018-12-30 17:09 ` Jacek Anaszewski
2018-12-30 17:35 ` Pavel Machek
2018-12-31 15:43 ` Jacek Anaszewski
2018-12-31 15:47 ` Jacek Anaszewski
2018-12-31 19:15 ` Dan Murphy
2019-01-01 14:42 ` Jacek Anaszewski
2019-01-01 18:11 ` Dan Murphy
2019-01-01 22:06 ` Jacek Anaszewski
2018-12-31 16:28 ` Pavel Machek
2019-01-01 14:26 ` Jacek Anaszewski
2018-12-19 22:03 ` Pavel Machek
2018-12-19 22:08 ` Dan Murphy
2018-12-19 22:27 ` Pavel Machek
2018-12-20 1:31 ` Dan Murphy
2018-12-20 9:06 ` Pavel Machek
2018-12-20 14:03 ` Dan Murphy
2019-01-08 21:10 ` Jacek Anaszewski
2019-01-08 21:17 ` Dan Murphy
2019-07-22 20:59 ` Backlight in motorola Droid 4 Pavel Machek
2019-07-23 15:53 ` Dan Murphy
2019-07-24 8:22 ` Pavel Machek
2019-07-24 12:45 ` Pavel Machek
2019-07-24 15:10 ` Dan Murphy
2019-07-24 15:22 ` Dan Murphy
2019-07-26 14:38 ` Dan Murphy
2019-07-29 22:00 ` Pavel Machek
2019-07-30 18:21 ` Dan Murphy
2019-07-30 21:52 ` Pavel Machek
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