Re: [PATCH v1 1/2] dt-bindings: backlight: gpio-backlight: allow multiple GPIOs

[Daniel Thompson <daniel@riscstar.com>]

On Tue, Jan 13, 2026 at 10:15:53AM +0530, tessolveupstream@gmail.com wrote:
>
>
> On 05-01-2026 15:25, Daniel Thompson wrote:
> > On Mon, Jan 05, 2026 at 02:21:19PM +0530, Sudarshan Shetty wrote:
> >> Update the gpio-backlight binding to support configurations that require
> >> more than one GPIO for enabling/disabling the backlight.
> >>
> >> Signed-off-by: Sudarshan Shetty <tessolveupstream@gmail.com>
> >> ---
> >>  .../bindings/leds/backlight/gpio-backlight.yaml      | 12 +++++++++++-
> >>  1 file changed, 11 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
> >> index 584030b6b0b9..1483ce4a3480 100644
> >> --- a/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
> >> +++ b/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
> >> @@ -17,7 +17,8 @@ properties:
> >>
> >>    gpios:
> >>      description: The gpio that is used for enabling/disabling the backlight.
> >> -    maxItems: 1
> >> +    minItems: 1
> >> +    maxItems: 2
> >
> > Why 2?
> >
>
> In the current design, the LVDS panel has a single backlight that
> is controlled by two GPIOs. Initially, It described as two separate
> backlight devices using the same gpio-backlight driver, since the
> existing driver supports only one GPIO per instance.
>
> So the maintainer suggested to extend the gpio-backlight driver
> and bindings to support multiple GPIOs.
> https://lore.kernel.org/all/q63bdon55app4gb2il5e7skyc6z2amcnaiqbqlhen7arkxphtb@3jejbelji2ti/

Right. So, once we support multiple GPIOs then why limit it to 2?


Daniel.