linux-kernel - Re: [PATCH V5 3/8] backlight: qcom-wled: Add new properties for PMI8998

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Message-ID: <20180827100143.GE31905@amd>
Date:   Mon, 27 Aug 2018 12:01:43 +0200
From:   Pavel Machek <pavel@....cz>
To:     Kiran Gunda <kgunda@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, jingoohan1@...il.com,
        lee.jones@...aro.org, b.zolnierkie@...sung.com,
        dri-devel@...ts.freedesktop.org, daniel.thompson@...aro.org,
        jacek.anaszewski@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH V5 3/8] backlight: qcom-wled: Add new properties for
 PMI8998

Hi!

On Fri 2018-08-24 15:57:42, Kiran Gunda wrote:
> Update the bindings with the new properties used for
> PMI8998.

> Changes from V3:
>     - Removed the default values.

Why?

> +- qcom,current-limit-microamp
> +	Usage:        optional
> +	Value type:   <u32>
> +	Definition:   uA; per-string current limit; value from 0 to 30000 with
> +		      2500 uA step.
>  
>  - qcom,current-boost-limit
>  	Usage:        optional
>  	Value type:   <u32>
>  	Definition:   mA; boost current limit.
>  		      For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
> -		      1680. Default: 805 mA
> +		      1680.
>  		      For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
> -		      1500. Default: 970 mA
> +		      1500.
>

I'd say that optional properties should list default values...?

>  - qcom,ovp
>  	Usage:        optional
>  	Value type:   <u32>
>  	Definition:   V; Over-voltage protection limit; one of:
> -		      27, 29, 32, 35. default: 29V
> +		      27, 29, 32, 35.
>  		      This property is supported only for PM8941.
>

Same here.

> +- qcom,ovp-millivolt
> +	Usage:        optional
> +	Value type:   <u32>
> +	Definition:   mV; Over-voltage protection limit;
> +		      For pmi8998: one of 18100, 19600, 29600, 31100
> +		      If this property is not specified for PM8941, it
> +		      falls back to "qcom,ovp" property.
> +

"voltage-limit-millivolt"? "ovp" is not really well known acronym.
									Pavel
									
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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