linux-kernel - Re: [PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

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Message-ID: <564459FE.8020209@gmail.com>
Date:	Thu, 12 Nov 2015 10:21:02 +0100
From:	Jacek Anaszewski <jacek.anaszewski@...il.com>
To:	Ingi Kim <ingi2.kim@...sung.com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>
CC:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	sameo@...ux.intel.com, lee.jones@...aro.org, rpurdie@...ys.net,
	inki.dae@...sung.com, sw0312.kim@...sung.com,
	beomho.seo@...sung.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v4 2/2] leds: rt5033: Add RT5033 Flash led device driver

Hi Ingi,

On 11/12/2015 08:57 AM, Ingi Kim wrote:
[...]
>>> +        regmap_write(led->regmap, RT5033_REG_FLED_FUNCTION1, val);
>>> +    } else {
>>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION1,
>>> +                   RT5033_FLED_FUNC1_MASK, RT5033_FLED_PINCTRL |
>>> +                   rt5033_fled_used(led, fled_id));
>>> +        regmap_update_bits(led->regmap,    RT5033_REG_FLED_CTRL1,
>>> +                   RT5033_FLED_CTRL1_MASK,
>>> +                   (brightness - 1) << 4);
>>> +        regmap_update_bits(led->regmap, RT5033_REG_FLED_FUNCTION2,
>>> +                   RT5033_FLED_FUNC2_MASK, RT5033_FLED_ENFLED);
>>> +    }
>>
>> How are you distinguishing between setting brightness for iout_joint
>> case and for individual LEDs? Have you tested this use case?
>> Even if you don't have a board with two separate LEDs,
>> you should be able to test two LED class devices with a single
>> connected LED.
>>
>
> Thanks, I missed a iout_joint case :(
> I have tested a board with integrated single LED,
> It looks fine and all feature works well even if it has limitation.

Please also test two separate LEDs case, by defining two child
nodes in DT, and in a result you will get two LED class devices.
After that you can set brightness separately for each LED class
device, and you'll be able to verify that the driver works properly
by observing the single LED connected to both outputs.
In order to make the testing even more valuable, you can
set triggers for both LEDs

-- 
Best Regards,
Jacek Anaszewski
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