linux-kernel - Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998

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Date:   Thu, 16 Aug 2018 10:53:11 +0530
From:   kgunda@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     jingoohan1@...il.com, lee.jones@...aro.org,
        b.zolnierkie@...sung.com, dri-devel@...ts.freedesktop.org,
        daniel.thompson@...aro.org, jacek.anaszewski@...il.com,
        pavel@....cz, 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,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for
 PMI8998

On 2018-08-07 10:53, Bjorn Andersson wrote:
> On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
>> diff --git 
>> a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt 
>> b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> [..]
>>  - qcom,num-strings
>>  	Usage:        optional
>>  	Value type:   <u32>
>>  	Definition:   #; number of led strings attached;
>> -		      value from 1 to 3. default: 2
>> -		      This property is supported only for PM8941.
>> +		      value: For PM8941 from 1 to 3.
>> +			     For PMI8998 from 1 to 4.
> [..]
>> +- qcom,enabled-strings
>> +	Usage:        optional
>> +	Value tyoe:   <u32 array>
>> +	Definition:   Array of the WLED strings numbered from 0 to 3. Each
>> +		      string of leds are operated individually. Specify the
>> +		      list of strings used by the device. Any combination of
>> +		      led strings can be used.
> [..]
>> 
>>  Example:
>> 
>> @@ -99,4 +146,5 @@ pm8941-wled@...0 {
>>  	qcom,switching-freq = <1600>;
>>  	qcom,ovp = <29>;
>>  	qcom,num-strings = <2>;
>> +	qcom,enabled-strings = <0x00 0x01>;
> 
> Nit. I would assume that specifying qcom,num-strings = <2> implies that
> the first 2 strings are used, so one would not also specify
> qcom,enabled-strings.
> 
Thanks Bjorn for reviewing the series !

"qcom,enabled-strings" need be specified along with the 
"qcom,num-strings".
Because the enabled-strings can be <0, 2> or <0, 3 > also. The driver 
picks the string
configuration from the enabled-strings array and enable only those 
current-sinks.

> (And you should use decimal for natural numbers)
> 
I will modify it in next series.
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Regards,
> Bjorn
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