linux-kernel - Re: [PATCH v2 2/2] dt-bindings: lantiq: Update for new SoC

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Date:   Tue, 20 Aug 2019 11:00:50 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Rahul Tanwar <rahul.tanwar@...ux.intel.com>
Cc:     devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        qi-ming.wu@...el.com, cheol.yong.kim@...el.com,
        rahul.tanwar@...el.com
Subject: Re: [PATCH v2 2/2] dt-bindings: lantiq: Update for new SoC

On Tue, Aug 20, 2019 at 3:29 AM Rahul Tanwar
<rahul.tanwar@...ux.intel.com> wrote:
>
> Intel Lightning Mountain(LGM) SoC reuses Lantiq ASC serial controller IP.
> Update the dt bindings to support LGM as well.
>
> Signed-off-by: Rahul Tanwar <rahul.tanwar@...ux.intel.com>
> ---
>  .../devicetree/bindings/serial/lantiq_asc.yaml          | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/serial/lantiq_asc.yaml b/Documentation/devicetree/bindings/serial/lantiq_asc.yaml
> index 54b90490f4fb..92807b59b024 100644
> --- a/Documentation/devicetree/bindings/serial/lantiq_asc.yaml
> +++ b/Documentation/devicetree/bindings/serial/lantiq_asc.yaml
> @@ -17,6 +17,7 @@ properties:
>      oneOf:
>        items:
>          - const: lantiq,asc
> +        - const: intel,lgm-asc

Better expressed as:

compatible:
  enum:
    - intel,lgm-asc
    - lantiq,asc

>
>    reg:
>      maxItems: 1
> @@ -28,6 +29,12 @@ properties:
>        - description: tx or combined interrupt
>        - description: rx interrupt
>        - description: err interrupt
> +    description:
> +      For lantiq,asc compatible, it supports 3 separate
> +      interrupts for tx rx & err. Whereas, for intel,lgm-asc
> +      compatible, it supports combined single interrupt for
> +      all of tx, rx & err interrupts.

This can be expressed with an if/then schema. There's some examples in
the tree how to do that.

> +
>
>    clocks:
>      description:
> @@ -67,4 +74,14 @@ examples:
>              interrupts = <112 113 114>;
>      };
>
> +  - |
> +    asc0: serial@...00000 {
> +            compatible = "intel,lgm-asc";
> +            reg = <0xe0a00000 0x1000>;
> +            interrupt-parent = <&ioapic1>;
> +            interrupts = <128 1>;
> +            clocks = <&cgu0 LGM_CLK_NOC4>, <&cgu0 LGM_GCLK_ASC0>;
> +            clock-names = "freq", "asc";
> +    };
> +
>  ...
> --
> 2.11.0
>