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

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Message-ID: <c182df66-8503-49cf-8d1d-7da17214b843@gmail.com>
Date: Tue, 13 Jan 2026 10:15:53 +0530
From: tessolveupstream@...il.com
To: Daniel Thompson <daniel@...cstar.com>
Cc: lee@...nel.org, danielt@...nel.org, jingoohan1@...il.com, deller@....de,
 pavel@...nel.org, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
 linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: backlight: gpio-backlight: allow
 multiple GPIOs



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@...il.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/
> 
> Daniel.