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

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Date:   Mon, 7 Jan 2019 13:34:39 -0600
From:   Dan Murphy <dmurphy@...com>
To:     Vesa Jääskeläinen <dachaac@...il.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
CC:     <robh+dt@...nel.org>, <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

Vesa

On 1/4/19 6:39 PM, 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
> 

Can we not use led-sources like I have done already?
I really like to keep the DT nodes simple and re-use nodes that exist if possible.

My code already maps and groups the outputs into the associated banks

Dan
<snip>

-- 
------------------
Dan Murphy