linux-kernel - Re: [RESEND] dt-bindings: serial: fsl-lpuart: Add i.MX8DXL compatible

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Date:   Tue, 21 Dec 2021 09:43:39 -0400
From:   Rob Herring <robh@...nel.org>
To:     Abel Vesa <abel.vesa@....com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND] dt-bindings: serial: fsl-lpuart: Add i.MX8DXL compatible

On Tue, Dec 21, 2021 at 7:16 AM Abel Vesa <abel.vesa@....com> wrote:
>
> Add i.MX8DXL lpuart compatible to the bindings documentation.
>
> Signed-off-by: Abel Vesa <abel.vesa@....com>
> ---
>
> This is a resend of the following, but as a separate patch.
>
> https://lore.kernel.org/linux-arm-kernel/YcCisM3BqM984k%2F1@kroah.com/
>
>  Documentation/devicetree/bindings/serial/fsl-lpuart.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml b/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
> index 6e04e3848261..1f482e166467 100644
> --- a/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
> +++ b/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
> @@ -30,6 +30,10 @@ properties:
>        - items:
>            - const: fsl,imx8qm-lpuart
>            - const: fsl,imx8qxp-lpuart
> +      - items:
> +          - const: fsl,imx8dxl-lpuart
> +          - const: fsl,imx8qxp-lpuart
> +          - const: fsl,imx7ulp-lpuart

It doesn't really make sense that imx8qm and imx8dxl are backwards
compatible with imx8qxp, but only imx8qm is backwards compatible to
imx7ulp. Ir only makes sense if some feature/quirk specific to
fsl,imx7ulp-lpuart is gone in imx8qm.

Rob