On 14-01-2026 21:23, Daniel Thompson wrote:
> On Tue, Jan 13, 2026 at 10:15:53AM +0530, [email protected] 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 <[email protected]>
>>>> ---
>>>> .../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?
>
Okay, got the point. I'm removing the maxItems constraint entirely
to allow any number of GPIOs as below:
diff --git
a/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
b/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
index 1483ce4a3480..82698519daff 100644
--- a/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
+++ b/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
@@ -16,9 +16,11 @@ properties:
const: gpio-backlight
gpios:
- description: The gpio that is used for enabling/disabling the backlight.
+ description: |
+ The gpio that is used for enabling/disabling the backlight.
+ Multiple GPIOs can be specified for panels that require several
+ enable signals.
minItems: 1
- maxItems: 2
default-on:
description: enable the backlight at boot.
Does this approach work for you?
>
> Daniel.
