linux-kernel - Re: [PATCH v4 net-next 1/4] dt-bindings: net: nfc: s3fwrn5: Support a UART interface

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Message-ID: <20201201200725.GB2435@kozik-lap>
Date:   Tue, 1 Dec 2020 22:07:25 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Bongsu Jeon <bongsu.jeon2@...il.com>
Cc:     linux-nfc@...ts.01.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bongsu Jeon <bongsu.jeon@...sung.com>
Subject: Re: [PATCH v4 net-next 1/4] dt-bindings: net: nfc: s3fwrn5: Support
 a UART interface

On Tue, Dec 01, 2020 at 10:50:25PM +0900, Bongsu Jeon wrote:
> From: Bongsu Jeon <bongsu.jeon@...sung.com>
> 
> Since S3FWRN82 NFC Chip, The UART interface can be used.
> S3FWRN82 supports I2C and UART interface.
> 
> Signed-off-by: Bongsu Jeon <bongsu.jeon@...sung.com>
> ---
>  .../bindings/net/nfc/samsung,s3fwrn5.yaml          | 32 ++++++++++++++++++++--
>  1 file changed, 29 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
> index cb0b8a5..cc5f9a1 100644
> --- a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
> +++ b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
> @@ -12,7 +12,10 @@ maintainers:
>  
>  properties:
>    compatible:
> -    const: samsung,s3fwrn5-i2c
> +    items:

This still has items but it should be a simple enum.

> +      - enum:
> +          - samsung,s3fwrn5-i2c
> +          - samsung,s3fwrn82
>  
>    en-gpios:
>      maxItems: 1
> @@ -47,10 +50,19 @@ additionalProperties: false
>  required:
>    - compatible
>    - en-gpios
> -  - interrupts
> -  - reg
>    - wake-gpios
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: samsung,s3fwrn5-i2c
> +    then:
> +      required:
> +        - interrupts
> +        - reg
> +
>  examples:
>    - |
>      #include <dt-bindings/gpio/gpio.h>
> @@ -71,3 +83,17 @@ examples:
>              wake-gpios = <&gpj0 2 GPIO_ACTIVE_HIGH>;
>          };
>      };
> +  # UART example on Raspberry Pi
> +  - |
> +    uart0 {
> +        status = "okay";
> +
> +        nfc {
> +            compatible = "samsung,s3fwrn82";
> +
> +            en-gpios = <&gpio 20 0>;
> +            wake-gpios = <&gpio 16 0>;

Use GPIO flags like in example above.

Best regards,
Krzysztof