linux-kernel - Re: [PATCH V3 3/7] backlight: qcom-wled: Add new properties for PMI8998

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Date:   Wed, 20 Jun 2018 10:55:26 +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 <daniel.thompson@...aro.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <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 V3 3/7] backlight: qcom-wled: Add new properties for
 PMI8998

On 2018-06-20 04:33, Bjorn Andersson wrote:
> On Tue 19 Jun 04:13 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. default: 2
>> +			     For PMI8998 from 1 to 4. default: 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.
>> +		      for pm8941: Default values are [00 01].
>> +		      for pmi8998: Default values are [00 01 02 03].
> 
> I would suggest omitting the defaults, as we can see in several places
> in this document we end up having to update the document with new
> defaults for each platform.
> 
> Also, per the defaults of the optional qcom,num-strings these are
> already the defaults...
> 
Sure. I will remove the defaults in the next series.
> [..]
>> +pmi8998-wled@...0 {
>> +	compatible = "qcom,pmi8998-wled";
>> +	reg = <0xd800 0xd900>;
>> +	label = "backlight";
>> +
>> +	interrupts = <3 0xd8 2 IRQ_TYPE_EDGE_RISING>,
>> +		     <3 0xd8 1 IRQ_TYPE_EDGE_RISING>;
>> +	interrupt-names = "short", "ovp";
>> +	qcom,current-limit-microamp = <25000>;
>> +	qcom,current-boost-limit = <805>;
>> +	qcom,switching-freq = <1600>;
>> +	qcom,ovp-millivolt = <29600>;
>> +	qcom,num-strings = <4>;
>> +	qcom,enabled-strings = <0x00 0x01 0x02 0x03>;
> 
> Please omit the pmi8998 example as well, there's no real benefit of
> adding similar examples for each platform.
> 
Sure. I will remove it.
> Regards,
> Bjorn