linux-kernel - Re: [PATCH net-next 4/4] ARM: dts: lan966x: use new microchip,lan9668-switch compatible

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Date:   Thu, 30 Jun 2022 21:18:51 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Michael Walle <michael@...le.cc>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 4/4] ARM: dts: lan966x: use new
 microchip,lan9668-switch compatible

On 30/06/2022 16:02, Michael Walle wrote:
> The old generic microchip,lan966x-switch compatible string was
> deprecated. Use the new one.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  arch/arm/boot/dts/lan966x.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/lan966x.dtsi b/arch/arm/boot/dts/lan966x.dtsi
> index 48971d80c82c..da0657c57cdf 100644
> --- a/arch/arm/boot/dts/lan966x.dtsi
> +++ b/arch/arm/boot/dts/lan966x.dtsi
> @@ -85,7 +85,7 @@ soc {
>  		ranges;
>  
>  		switch: switch@...00000 {
> -			compatible = "microchip,lan966x-switch";
> +			compatible = "microchip,lan9668-switch";

While technically correct, the change cannot go via independent trees
and may break out-of-tree users of this DTS.

Usually the nicer way is to use two compatibles (the old as fallback).
Anyway, this one is fine with me - up to subarch maintainer.

Best regards,
Krzysztof