linux-kernel - Re: [PATCH/RFC v8 11/14] DT: Add documentation for the mfd Maxim max77693

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Date:	Mon, 01 Dec 2014 13:58:31 +0100
From:	Jacek Anaszewski <j.anaszewski@...sung.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-leds@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, kyungmin.park@...sung.com,
	b.zolnierkie@...sung.com, cooloney@...il.com, rpurdie@...ys.net,
	sakari.ailus@....fi, s.nawrocki@...sung.com,
	Andrzej Hajda <a.hajda@...sung.com>,
	Lee Jones <lee.jones@...aro.org>,
	SangYoung Son <hello.son@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH/RFC v8 11/14] DT: Add documentation for the mfd Maxim
 max77693

Hi Pavel,

Thanks for the review.

On 11/29/2014 08:26 PM, Pavel Machek wrote:
> Hi!
>
>> diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt
>> index 01e9f30..50a8dad 100644
>> --- a/Documentation/devicetree/bindings/mfd/max77693.txt
>> +++ b/Documentation/devicetree/bindings/mfd/max77693.txt
>> @@ -41,6 +41,62 @@ Optional properties:
>>   	 To get more informations, please refer to documentaion.
>>   	[*] refer Documentation/devicetree/bindings/pwm/pwm.txt
>>
>> +- led-flash : the LED submodule device node
>> +
>> +There are two led outputs available - fled1 and fled2. Each of them can
>> +control a separate led or they can be connected together to double
>> +the maximum current for a single connected led. One led is represented
>> +by one child node.
>> +
>> +Required properties:
>> +- compatible : must be "maxim,max77693-flash"
>> +
>> +Optional properties:
>> +- maxim,fleds : array of current outputs in order: fled1, fled2
>> +	Note: both current outputs can be connected to a single led
>> +	Possible values:
>> +		0 - the output is left disconnected,
>> +		1 - a diode is connected to the output.
>
> Is this one needed? Just ommit child note if it is not there.

It is needed because you can have one led connected two both
outputs. This allows to describe such a design.

>> +- maxim,trigger-type : Array of trigger types in order: flash, torch
>> +	Possible trigger types:
>> +		0 - Rising edge of the signal triggers the flash/torch,
>> +		1 - Signal level controls duration of the flash/torch.
>> +- maxim,trigger : Array of flags indicating which trigger can activate given led
>> +	in order: fled1, fled2
>> +	Possible flag values (can be combined):
>> +		1 - FLASH pin of the chip,
>> +		2 - TORCH pin of the chip,
>> +		4 - software via I2C command.
>
> Is it good idea to have bitfields like this?
>
> Make these required properties of the subnode?

This is related to a single property: trigger. I think that splitting
it to three properties would make unnecessary noise in the
binding.

Best Regards,
Jacek Anaszewski

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