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

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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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