linux-kernel - Re: [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3

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Date:   Thu, 16 Aug 2018 10:58:51 +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-fbdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for
 WLED3

On 2018-08-07 11:07, Bjorn Andersson wrote:
> On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
>> diff --git a/drivers/video/backlight/qcom-wled.c 
>> b/drivers/video/backlight/qcom-wled.c
> [..]
>> @@ -365,6 +434,15 @@ static int wled_configure(struct wled *wled, 
>> struct device *dev)
>> 
>>  	cfg->num_strings = cfg->num_strings + 1;
>> 
>> +	string_len = of_property_count_elems_of_size(dev->of_node,
>> +						     "qcom,enabled-strings",
>> +						     sizeof(u32));
>> +	if (string_len > 0)
>> +		rc = of_property_read_u32_array(dev->of_node,
>> +						"qcom,enabled-strings",
>> +						wled->cfg.enabled_strings,
> 
> qcom,enabled-strings is listed as optional, but without it we will end
> up with qcom,num-strings zeros in an array.  Initialize
> wled->cfg.enabled_strings to 0,1,2,3 and the driver will be backwards
> compatible.
> 
Correct. I will initialize the array in the next series.
> I also think that if you do qcom,enabled-strings = <0, 1, 2>; there's 
> no
> need to also specify qcom,num-strings = <3>; and we can just use
> string_len for num_strings.
Correct. But I have kept this property to have the backward 
compatibility with the
old driver (WLED3).
> 
>> +						sizeof(u32));
>> +
>>  	return 0;
>>  }
> 
> Regards,
> Bjorn
> --
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