Re: [PATCH 03/16] dt-bindings: fpga: machxo2-slave: add pin for program sequence init

[Xu Yilun <yilun.xu@intel.com>]

On 2022-08-25 at 16:13:30 +0200, Johannes Zink wrote:
> This commit adds a pin which initiates the FPGA programming sequence
> once pulsed low.

Why we don't have to use this pin before?

Thanks,
Yilun

> 
> Signed-off-by: Johannes Zink <j.zink@pengutronix.de>
> ---
>  .../devicetree/bindings/fpga/lattice,machxo2-slave.yaml    | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/fpga/lattice,machxo2-slave.yaml b/Documentation/devicetree/bindings/fpga/lattice,machxo2-slave.yaml
> index 78f0da8f772f..03dc134ec7b8 100644
> --- a/Documentation/devicetree/bindings/fpga/lattice,machxo2-slave.yaml
> +++ b/Documentation/devicetree/bindings/fpga/lattice,machxo2-slave.yaml
> @@ -26,6 +26,12 @@ properties:
>      enum:
>        - lattice,machxo2-slave-spi
>  
> +  program-gpios:
> +    maxItems: 1
> +    description: |
> +      GPIO Output tied to the FPGA's n_program pin to initiate a
> +      programming sequence. This pin is active low.
> +
>    lattice,erase-sram:
>      type: boolean
>      description: SRAM is to be erased during flash erase operation
> @@ -57,5 +63,6 @@ examples:
>              reg = <0>;
>              lattice,erase-sram;
>              lattice,erase-feature-row;
> +            lattice,program-gpios = <&gpio1 2 GPIO_ACTIVE_LOW>
>          };
>      };
> -- 
> 2.30.2
>