linux-kernel - Re: [RFC PATCH 03/34] arm64: dts: allwinner: a64: Fix the audio codec compatible

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Date:   Mon, 17 Feb 2020 14:56:49 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Mylène Josserand 
        <mylene.josserand@...e-electrons.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [RFC PATCH 03/34] arm64: dts: allwinner: a64: Fix the audio
 codec compatible

On Mon, Feb 17, 2020 at 12:42:19AM -0600, Samuel Holland wrote:

> Cc: stable@...nel.org
> Fixes: ec4a95409d5c ("arm64: dts: allwinner: a64: add nodes necessary for analog sound support")
> Signed-off-by: Samuel Holland <samuel@...lland.org>

>  		codec: codec@...2e00 {
>  			#sound-dai-cells = <0>;
> -			compatible = "allwinner,sun8i-a33-codec";
> +			compatible = "allwinner,sun50i-a64-codec";

This is an incompatible change in the ABI, it's going to break unless
it's applied at exactly the same time as the matching kernel update
adding the new compatible string.  That's not suitable for stable, you
need to keep the old compatible as a fallback.

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