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

- From: \<hidden\>
- Date: 2018-08-16 05:28:55 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2018/08/5358155
- Thread: https://ratatoskr.run/dri-devel/2018/07/5327623/t.md

```text
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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```