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

[kgunda]

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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