Re: [PATCH 1/3] dt-bindings: leds: rt8515: Support single-GPIO flash ICs with unlock gate

[Krzysztof Kozlowski]

On Fri, Mar 06, 2026 at 04:58:02PM -0800, Rudraksha Gupta wrote:
> Some flash ICs use the same one-wire pulse-count protocol as the RT8515
> but have only a single GPIO line for both flash and torch modes, plus an
> optional unlock gate (e.g. a PMIC MPP) that must be driven high before
> the chip responds to the enable GPIO.
> 
> Make ent-gpios optional and add an unlock-gpios property to support
> these variants. Add a oneOf constraint requiring exactly one of
> ent-gpios or unlock-gpios. Add a binding example showing the
> single-GPIO configuration.
> 
> Signed-off-by: Rudraksha Gupta <guptarud@xxxxxxxxx>
> ---
>  .../devicetree/bindings/leds/richtek,rt8515.yaml   | 36 +++++++++++++++++++++-
>  1 file changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml
> index 0356371a6b01..820cf8c55090 100644
> --- a/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml
> +++ b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml
> @@ -15,6 +15,10 @@ description: |
>    current for each mode is defined in hardware using two resistors
>    RFS and RTS.
>  
> +  This driver also supports single-GPIO flash ICs that use the same

Drop reference to driver and explain the hardware here.

> +  one-wire pulse-count protocol on one line for both flash and torch.
> +  For these, only enf-gpios is required.
> +
>  properties:
>    compatible:
>      const: richtek,rt8515
> @@ -26,6 +30,14 @@ properties:
>    ent-gpios:
>      maxItems: 1
>      description: A connection to the 'ENT' (enable torch) pin.
> +      Optional for single-GPIO flash ICs where enf-gpios is used for
> +      both flash and torch modes.

So what happens with ENT GPIO on such boards? How is it connected?

Best regards,
Krzysztof