On Tue, Oct 27, 2026 at 03:34:19PM +0100, Krzysztof Kozlowski wrote: > On 27/10/2026 11:57, Vishnu Saini wrote: > > On Tue, Oct 27, 2026 at 09:12:27AM +0100, Krzysztof Kozlowski wrote: > >> On Sun, Oct 25, 2026 at 12:18:17PM +0530, Vishnu Saini wrote: > >>> The DLC0697 panel is lit by a separate backlight device, which is > >>> referenced from the panel node through the common 'backlight' > >>> property. > >>> > >>> Declare 'backlight: true' so the property is explicitly allowed by the > >>> schema. > >> > >> Why do you need to explicitly allow it? Since when? > >> > >> I see no benefit of this patch and commit msg does not explain me what > >> that benefit would be. > > It is required for below DLC panel, when enabling backlight using > > gpio-backlight driver, > > How is it required? You did not really answer, so again: > > Why do you need to explicitly allow it? > > Answer starts "because ... " and you provide technical arguments, not > wishes. Because the DLC panel node references an external gpio-backlight device through the backlight property, but the current DLC binding does not allow this property. As a result, adding the backlight phandle to the panel node causes a dtbs_check validation error.
Adding backlight: true to the binding allows the common panel backlight property used by this DT. I will improve the commit message. > > Best regards, > Krzysztof
