linux-kernel - Re: [PATCH 04/24] dt-bindings: leds: Add function and color properties

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Date:   Fri, 9 Nov 2018 21:00:17 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Dan Murphy <dmurphy@...com>, linux-leds@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        pavel@....cz, robh@...nel.org,
        Baolin Wang <baolin.wang@...aro.org>,
        Daniel Mack <daniel@...que.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Oleh Kravchenko <oleg@....org.ua>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Simon Shields <simon@...eageos.org>,
        Xiaotong Lu <xiaotong.lu@...eadtrum.com>
Subject: Re: [PATCH 04/24] dt-bindings: leds: Add function and color
 properties

Dan,

On 11/08/2018 10:08 PM, Dan Murphy wrote:
> Jacek
> 
> On 11/08/2018 02:47 PM, Jacek Anaszewski wrote:
>> Dan,
>>
>> On 11/08/2018 07:00 PM, Dan Murphy wrote:
>>> Jacek
>>>
>>> On 11/06/2018 04:07 PM, Jacek Anaszewski wrote:
>>>> Introduce dedicated properties for conveying information about
>>>> LED function and color. Mark old "label" property as deprecated.
>>>>
>>>> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
>>>> Cc: Baolin Wang <baolin.wang@...aro.org>
>>>> Cc: Daniel Mack <daniel@...que.org>
>>>> Cc: Dan Murphy <dmurphy@...com>
>>>> Cc: Linus Walleij <linus.walleij@...aro.org>
>>>> Cc: Oleh Kravchenko <oleg@....org.ua>
>>>> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
>>>> Cc: Simon Shields <simon@...eageos.org>
>>>> Cc: Xiaotong Lu <xiaotong.lu@...eadtrum.com>
>>>> ---
>>>>  Documentation/devicetree/bindings/leds/common.txt | 52 +++++++++++++++++++----
>>>>  1 file changed, 44 insertions(+), 8 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
>>>> index aa13998..3efc826 100644
>>>> --- a/Documentation/devicetree/bindings/leds/common.txt
>>>> +++ b/Documentation/devicetree/bindings/leds/common.txt
>>>> @@ -10,14 +10,20 @@ can influence the way of the LED device initialization, the LED components
>>>>  have to be tightly coupled with the LED device binding. They are represented
>>>>  by child nodes of the parent LED device binding.
>>>>  
>>>> +
>>>>  Optional properties for child nodes:
>>>>  - led-sources : List of device current outputs the LED is connected to. The
>>>>  		outputs are identified by the numbers that must be defined
>>>>  		in the LED device binding documentation.
>>>> +- function: LED functon. Use one of the LED_FUNCTION_* prefixed definitions
>>>> +	    from the header include/dt-bindings/leds/functions.h.
>>>> +	    If there is no matching LED_FUNCTION available, add a new one.
>>>> +- color : Color of the LED.
>>>
>>> Should we define the colors too?  There are only really 4.  Red, green, blue and white.
>>>
>>> Generally varying colors are created base on the primary colors.  Even the amber color
>>
>> No problem, I can add LED colors. However, I don't quite follow how
>> the mix of base color strings would give "amber" ? :-)
>>
> 
> Amber or yellow.  Red and green with a hint of blue or no blue depending on how dark you want it.
> 
> You don't always have to turn the LED on full to mix.  Sometimes lowering the level of the stronger colors like red 
> and upping weaker colors like green you can different color

That's obvious. I was rather curious what you had on mind by mentioning
four colors (red, green, blue and white) in the context of "amber".
Just to remind: we're still talking about LED names, not the values.

-- 
Best regards,
Jacek Anaszewski