linux-kernel - Re: [PATCH net-next 1/2] dt-bindings: net: nfc: s3fwrn5: Support a UART interface

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Message-ID: <20201123080123.GA5656@kozik-lap>
Date:   Mon, 23 Nov 2020 09:01:23 +0100
From:   "krzk@...nel.org" <krzk@...nel.org>
To:     Bongsu Jeon <bongsu.jeon@...sung.com>
Cc:     "kuba@...nel.org" <kuba@...nel.org>,
        "linux-nfc@...ts.01.org" <linux-nfc@...ts.01.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] dt-bindings: net: nfc: s3fwrn5: Support a
 UART interface

On Mon, Nov 23, 2020 at 04:55:26PM +0900, Bongsu Jeon wrote:
> 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     | 28 +++++++++++++++++--
>  1 file changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
> index cb0b8a560282..37b3e5ae5681 100644
> --- a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
> +++ b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
> @@ -13,6 +13,7 @@ maintainers:
>  properties:
>    compatible:
>      const: samsung,s3fwrn5-i2c
> +    const: samsung,s3fwrn82-uart

This does not work, you need to use enum. Did you run at least
dt_bindings_check?

The compatible should be just "samsung,s3fwrn82". I think it was a
mistake in the first s3fwrn5 submission to add a interface to
compatible.

>  
>    en-gpios:
>      maxItems: 1
> @@ -47,10 +48,19 @@ 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 +81,17 @@ examples:
>              wake-gpios = <&gpj0 2 GPIO_ACTIVE_HIGH>;
>          };
>      };
> +  # UART example on Raspberry Pi
> +  - |
> +    &uart0 {
> +        status = "okay";
> +
> +        s3fwrn82_uart {

Just "bluetooth" to follow Devicetree specification.

Best regards,
Krzysztof